Merge github.com:grpc/grpc into sceq

25 files changed, 978 insertions, 393 deletions

diff --git a/test/core/bad_client/gen_build_yaml.py b/test/core/bad_client/gen_build_yaml.py
index f37aa66c5f..c538bffd71 100755
--- a/test/core/bad_client/gen_build_yaml.py
+++ b/test/core/bad_client/gen_build_yaml.py
@@ -67,7 +67,9 @@ def main():
             'vs_proj_dir': 'test/bad_client',
             'deps': [
               'grpc_test_util_unsecure',
-              'grpc_unsecure'
+              'grpc_unsecure',
+              'gpr_test_util',
+              'gpr'
             ]
           }],
       'targets': [
@@ -82,7 +84,9 @@ def main():
               'deps': [
                   'bad_client_test',
                   'grpc_test_util_unsecure',
-                  'grpc_unsecure'
+                  'grpc_unsecure',
+                  'gpr_test_util',
+                  'gpr'
               ]
           }
       for t in sorted(BAD_CLIENT_TESTS.keys())]}
diff --git a/test/core/bad_ssl/gen_build_yaml.py b/test/core/bad_ssl/gen_build_yaml.py
index 9f05fed485..cc097a8fdf 100755
--- a/test/core/bad_ssl/gen_build_yaml.py
+++ b/test/core/bad_ssl/gen_build_yaml.py
@@ -58,7 +58,9 @@ def main():
               'platforms': ['linux', 'posix', 'mac'],
               'deps': [
                   'grpc_test_util',
-                  'grpc'
+                  'grpc',
+                  'gpr_test_util',
+                  'gpr'
               ]
           }
       ],
@@ -74,7 +76,9 @@ def main():
               'deps': [
                   'bad_ssl_test_server',
                   'grpc_test_util',
-                  'grpc'
+                  'grpc',
+                  'gpr_test_util',
+                  'gpr'
               ]
           }
       for t in sorted(BAD_CLIENT_TESTS.keys())] + [
@@ -88,7 +92,9 @@ def main():
               'platforms': ['linux', 'posix', 'mac'],
               'deps': [
                   'grpc_test_util',
-                  'grpc'
+                  'grpc',
+                  'gpr_test_util',
+                  'gpr'
               ]
           }
       for t in sorted(BAD_CLIENT_TESTS.keys())]}
diff --git a/test/core/census/log_test.c b/test/core/census/log_test.c
new file mode 100644
index 0000000000..b68ca11504
--- /dev/null
+++ b/test/core/census/log_test.c
@@ -0,0 +1,589 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/census/log.h"
+#include <grpc/support/cpu.h>
+#include <grpc/support/log.h>
+#include <grpc/support/port_platform.h>
+#include <grpc/support/sync.h>
+#include <grpc/support/thd.h>
+#include <grpc/support/time.h>
+#include <grpc/support/useful.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "test/core/util/test_config.h"
+
+// Change this to non-zero if you want more output.
+#define VERBOSE 0
+
+// Log size to use for all tests.
+#define LOG_SIZE_IN_MB 1
+#define LOG_SIZE_IN_BYTES (LOG_SIZE_IN_MB << 20)
+
+// Fills in 'record' of size 'size'. Each byte in record is filled in with the
+// same value. The value is extracted from 'record' pointer.
+static void write_record(char* record, size_t size) {
+  char data = (char)((uintptr_t)record % 255);
+  memset(record, data, size);
+}
+
+// Reads fixed size records. Returns the number of records read in
+// 'num_records'.
+static void read_records(size_t record_size, const char* buffer,
+                         size_t buffer_size, int* num_records) {
+  GPR_ASSERT(buffer_size >= record_size);
+  GPR_ASSERT(buffer_size % record_size == 0);
+  *num_records = (int)(buffer_size / record_size);
+  for (int i = 0; i < *num_records; ++i) {
+    const char* record = buffer + (record_size * (size_t)i);
+    char data = (char)((uintptr_t)record % 255);
+    for (size_t j = 0; j < record_size; ++j) {
+      GPR_ASSERT(data == record[j]);
+    }
+  }
+}
+
+// Tries to write the specified number of records. Stops when the log gets
+// full. Returns the number of records written. Spins for random
+// number of times, up to 'max_spin_count', between writes.
+static int write_records_to_log(int writer_id, size_t record_size,
+                                int num_records, int max_spin_count) {
+  int counter = 0;
+  for (int i = 0; i < num_records; ++i) {
+    int spin_count = max_spin_count ? rand() % max_spin_count : 0;
+    if (VERBOSE && (counter++ == num_records / 10)) {
+      printf("   Writer %d: %d out of %d written\n", writer_id, i, num_records);
+      counter = 0;
+    }
+    char* record = (char*)(census_log_start_write(record_size));
+    if (record == NULL) {
+      return i;
+    }
+    write_record(record, record_size);
+    census_log_end_write(record, record_size);
+    for (int j = 0; j < spin_count; ++j) {
+      GPR_ASSERT(j >= 0);
+    }
+  }
+  return num_records;
+}
+
+// Performs a single read iteration. Returns the number of records read.
+static int perform_read_iteration(size_t record_size) {
+  const void* read_buffer = NULL;
+  size_t bytes_available;
+  int records_read = 0;
+  census_log_init_reader();
+  while ((read_buffer = census_log_read_next(&bytes_available))) {
+    int num_records = 0;
+    read_records(record_size, (const char*)read_buffer, bytes_available,
+                 &num_records);
+    records_read += num_records;
+  }
+  return records_read;
+}
+
+// Asserts that the log is empty.
+static void assert_log_empty(void) {
+  census_log_init_reader();
+  size_t bytes_available;
+  GPR_ASSERT(census_log_read_next(&bytes_available) == NULL);
+}
+
+// Fills the log and verifies data. If 'no fragmentation' is true, records
+// are sized such that CENSUS_LOG_2_MAX_RECORD_SIZE is a multiple of record
+// size. If not a circular log, verifies that the number of records written
+// match the number of records read.
+static void fill_log(size_t log_size, int no_fragmentation, int circular_log) {
+  size_t size;
+  if (no_fragmentation) {
+    int log2size = rand() % (CENSUS_LOG_2_MAX_RECORD_SIZE + 1);
+    size = ((size_t)1 << log2size);
+  } else {
+    while (1) {
+      size = 1 + ((size_t)rand() % CENSUS_LOG_MAX_RECORD_SIZE);
+      if (CENSUS_LOG_MAX_RECORD_SIZE % size) {
+        break;
+      }
+    }
+  }
+  int records_written =
+      write_records_to_log(0 /* writer id */, size,
+                           (int)((log_size / size) * 2), 0 /* spin count */);
+  int records_read = perform_read_iteration(size);
+  if (!circular_log) {
+    GPR_ASSERT(records_written == records_read);
+  }
+  assert_log_empty();
+}
+
+// Structure to pass args to writer_thread
+typedef struct writer_thread_args {
+  // Index of this thread in the writers vector.
+  int index;
+  // Record size.
+  size_t record_size;
+  // Number of records to write.
+  int num_records;
+  // Used to signal when writer is complete
+  gpr_cv* done;
+  gpr_mu* mu;
+  int* count;
+} writer_thread_args;
+
+// Writes the given number of records of random size (up to kMaxRecordSize) and
+// random data to the specified log.
+static void writer_thread(void* arg) {
+  writer_thread_args* args = (writer_thread_args*)arg;
+  // Maximum number of times to spin between writes.
+  static const int MAX_SPIN_COUNT = 50;
+  int records_written = 0;
+  if (VERBOSE) {
+    printf("   Writer %d starting\n", args->index);
+  }
+  while (records_written < args->num_records) {
+    records_written += write_records_to_log(args->index, args->record_size,
+                                            args->num_records - records_written,
+                                            MAX_SPIN_COUNT);
+    if (records_written < args->num_records) {
+      // Ran out of log space. Sleep for a bit and let the reader catch up.
+      // This should never happen for circular logs.
+      if (VERBOSE) {
+        printf(
+            "   Writer %d stalled due to out-of-space: %d out of %d "
+            "written\n",
+            args->index, records_written, args->num_records);
+      }
+      gpr_sleep_until(GRPC_TIMEOUT_MILLIS_TO_DEADLINE(10));
+    }
+  }
+  // Done. Decrement count and signal.
+  gpr_mu_lock(args->mu);
+  (*args->count)--;
+  gpr_cv_signal(args->done);
+  if (VERBOSE) {
+    printf("   Writer %d done\n", args->index);
+  }
+  gpr_mu_unlock(args->mu);
+}
+
+// struct to pass args to reader_thread
+typedef struct reader_thread_args {
+  // Record size.
+  size_t record_size;
+  // Interval between read iterations.
+  int read_iteration_interval_in_msec;
+  // Total number of records.
+  int total_records;
+  // Signalled when reader should stop.
+  gpr_cv stop;
+  int stop_flag;
+  // Used to signal when reader has finished
+  gpr_cv* done;
+  gpr_mu* mu;
+  int running;
+} reader_thread_args;
+
+// Reads and verifies the specified number of records. Reader can also be
+// stopped via gpr_cv_signal(&args->stop). Sleeps for 'read_interval_in_msec'
+// between read iterations.
+static void reader_thread(void* arg) {
+  reader_thread_args* args = (reader_thread_args*)arg;
+  if (VERBOSE) {
+    printf("   Reader starting\n");
+  }
+  gpr_timespec interval = gpr_time_from_micros(
+      args->read_iteration_interval_in_msec * 1000, GPR_TIMESPAN);
+  gpr_mu_lock(args->mu);
+  int records_read = 0;
+  int num_iterations = 0;
+  int counter = 0;
+  while (!args->stop_flag && records_read < args->total_records) {
+    gpr_cv_wait(&args->stop, args->mu, interval);
+    if (!args->stop_flag) {
+      records_read += perform_read_iteration(args->record_size);
+      GPR_ASSERT(records_read <= args->total_records);
+      if (VERBOSE && (counter++ == 100000)) {
+        printf("   Reader: %d out of %d read\n", records_read,
+               args->total_records);
+        counter = 0;
+      }
+      ++num_iterations;
+    }
+  }
+  // Done
+  args->running = 0;
+  gpr_cv_signal(args->done);
+  if (VERBOSE) {
+    printf("   Reader: records: %d, iterations: %d\n", records_read,
+           num_iterations);
+  }
+  gpr_mu_unlock(args->mu);
+}
+
+// Creates NUM_WRITERS writers where each writer writes NUM_RECORDS_PER_WRITER
+// records. Also, starts a reader that iterates over and reads blocks every
+// READ_ITERATION_INTERVAL_IN_MSEC.
+// Number of writers.
+#define NUM_WRITERS 5
+static void multiple_writers_single_reader(int circular_log) {
+  // Sleep interval between read iterations.
+  static const int READ_ITERATION_INTERVAL_IN_MSEC = 10;
+  // Maximum record size.
+  static const size_t MAX_RECORD_SIZE = 20;
+  // Number of records written by each writer. This is sized such that we
+  // will write through the entire log ~10 times.
+  const int NUM_RECORDS_PER_WRITER =
+      (int)((10 * census_log_remaining_space()) / (MAX_RECORD_SIZE / 2)) /
+      NUM_WRITERS;
+  size_t record_size = ((size_t)rand() % MAX_RECORD_SIZE) + 1;
+  // Create and start writers.
+  writer_thread_args writers[NUM_WRITERS];
+  int writers_count = NUM_WRITERS;
+  gpr_cv writers_done;
+  gpr_mu writers_mu;  // protects writers_done and writers_count
+  gpr_cv_init(&writers_done);
+  gpr_mu_init(&writers_mu);
+  gpr_thd_id id;
+  for (int i = 0; i < NUM_WRITERS; ++i) {
+    writers[i].index = i;
+    writers[i].record_size = record_size;
+    writers[i].num_records = NUM_RECORDS_PER_WRITER;
+    writers[i].done = &writers_done;
+    writers[i].count = &writers_count;
+    writers[i].mu = &writers_mu;
+    gpr_thd_new(&id, &writer_thread, &writers[i], NULL);
+  }
+  // Start reader.
+  gpr_cv reader_done;
+  gpr_mu reader_mu;  // protects reader_done and reader.running
+  reader_thread_args reader;
+  reader.record_size = record_size;
+  reader.read_iteration_interval_in_msec = READ_ITERATION_INTERVAL_IN_MSEC;
+  reader.total_records = NUM_WRITERS * NUM_RECORDS_PER_WRITER;
+  reader.stop_flag = 0;
+  gpr_cv_init(&reader.stop);
+  gpr_cv_init(&reader_done);
+  reader.done = &reader_done;
+  gpr_mu_init(&reader_mu);
+  reader.mu = &reader_mu;
+  reader.running = 1;
+  gpr_thd_new(&id, &reader_thread, &reader, NULL);
+  // Wait for writers to finish.
+  gpr_mu_lock(&writers_mu);
+  while (writers_count != 0) {
+    gpr_cv_wait(&writers_done, &writers_mu, gpr_inf_future(GPR_CLOCK_REALTIME));
+  }
+  gpr_mu_unlock(&writers_mu);
+  gpr_mu_destroy(&writers_mu);
+  gpr_cv_destroy(&writers_done);
+  gpr_mu_lock(&reader_mu);
+  if (circular_log) {
+    // Stop reader.
+    reader.stop_flag = 1;
+    gpr_cv_signal(&reader.stop);
+  }
+  // wait for reader to finish
+  while (reader.running) {
+    gpr_cv_wait(&reader_done, &reader_mu, gpr_inf_future(GPR_CLOCK_REALTIME));
+  }
+  if (circular_log) {
+    // Assert that there were no out-of-space errors.
+    GPR_ASSERT(0 == census_log_out_of_space_count());
+  }
+  gpr_mu_unlock(&reader_mu);
+  gpr_mu_destroy(&reader_mu);
+  gpr_cv_destroy(&reader_done);
+  if (VERBOSE) {
+    printf("   Reader: finished\n");
+  }
+}
+
+static void setup_test(int circular_log) {
+  census_log_initialize(LOG_SIZE_IN_MB, circular_log);
+  GPR_ASSERT(census_log_remaining_space() == LOG_SIZE_IN_BYTES);
+}
+
+// Attempts to create a record of invalid size (size >
+// CENSUS_LOG_MAX_RECORD_SIZE).
+void test_invalid_record_size(void) {
+  static const size_t INVALID_SIZE = CENSUS_LOG_MAX_RECORD_SIZE + 1;
+  static const size_t VALID_SIZE = 1;
+  printf("Starting test: invalid record size\n");
+  setup_test(0);
+  void* record = census_log_start_write(INVALID_SIZE);
+  GPR_ASSERT(record == NULL);
+  // Now try writing a valid record.
+  record = census_log_start_write(VALID_SIZE);
+  GPR_ASSERT(record != NULL);
+  census_log_end_write(record, VALID_SIZE);
+  // Verifies that available space went down by one block. In theory, this
+  // check can fail if the thread is context switched to a new CPU during the
+  // start_write execution (multiple blocks get allocated), but this has not
+  // been observed in practice.
+  GPR_ASSERT(LOG_SIZE_IN_BYTES - CENSUS_LOG_MAX_RECORD_SIZE ==
+             census_log_remaining_space());
+  census_log_shutdown();
+}
+
+// Tests end_write() with a different size than what was specified in
+// start_write().
+void test_end_write_with_different_size(void) {
+  static const size_t START_WRITE_SIZE = 10;
+  static const size_t END_WRITE_SIZE = 7;
+  printf("Starting test: end write with different size\n");
+  setup_test(0);
+  void* record_written = census_log_start_write(START_WRITE_SIZE);
+  GPR_ASSERT(record_written != NULL);
+  census_log_end_write(record_written, END_WRITE_SIZE);
+  census_log_init_reader();
+  size_t bytes_available;
+  const void* record_read = census_log_read_next(&bytes_available);
+  GPR_ASSERT(record_written == record_read);
+  GPR_ASSERT(END_WRITE_SIZE == bytes_available);
+  assert_log_empty();
+  census_log_shutdown();
+}
+
+// Verifies that pending records are not available via read_next().
+void test_read_pending_record(void) {
+  static const size_t PR_RECORD_SIZE = 1024;
+  printf("Starting test: read pending record\n");
+  setup_test(0);
+  // Start a write.
+  void* record_written = census_log_start_write(PR_RECORD_SIZE);
+  GPR_ASSERT(record_written != NULL);
+  // As write is pending, read should fail.
+  census_log_init_reader();
+  size_t bytes_available;
+  const void* record_read = census_log_read_next(&bytes_available);
+  GPR_ASSERT(record_read == NULL);
+  // A read followed by end_write() should succeed.
+  census_log_end_write(record_written, PR_RECORD_SIZE);
+  census_log_init_reader();
+  record_read = census_log_read_next(&bytes_available);
+  GPR_ASSERT(record_written == record_read);
+  GPR_ASSERT(PR_RECORD_SIZE == bytes_available);
+  assert_log_empty();
+  census_log_shutdown();
+}
+
+// Tries reading beyond pending write.
+void test_read_beyond_pending_record(void) {
+  printf("Starting test: read beyond pending record\n");
+  setup_test(0);
+  // Start a write.
+  const size_t incomplete_record_size = 10;
+  void* incomplete_record = census_log_start_write(incomplete_record_size);
+  GPR_ASSERT(incomplete_record != NULL);
+  const size_t complete_record_size = 20;
+  void* complete_record = census_log_start_write(complete_record_size);
+  GPR_ASSERT(complete_record != NULL);
+  GPR_ASSERT(complete_record != incomplete_record);
+  census_log_end_write(complete_record, complete_record_size);
+  // Now iterate over blocks to read completed records.
+  census_log_init_reader();
+  size_t bytes_available;
+  const void* record_read = census_log_read_next(&bytes_available);
+  GPR_ASSERT(complete_record == record_read);
+  GPR_ASSERT(complete_record_size == bytes_available);
+  // Complete first record.
+  census_log_end_write(incomplete_record, incomplete_record_size);
+  // Have read past the incomplete record, so read_next() should return NULL.
+  // NB: this test also assumes our thread did not get switched to a different
+  // CPU between the two start_write calls
+  record_read = census_log_read_next(&bytes_available);
+  GPR_ASSERT(record_read == NULL);
+  // Reset reader to get the newly completed record.
+  census_log_init_reader();
+  record_read = census_log_read_next(&bytes_available);
+  GPR_ASSERT(incomplete_record == record_read);
+  GPR_ASSERT(incomplete_record_size == bytes_available);
+  assert_log_empty();
+  census_log_shutdown();
+}
+
+// Tests scenario where block being read is detached from a core and put on the
+// dirty list.
+void test_detached_while_reading(void) {
+  printf("Starting test: detached while reading\n");
+  setup_test(0);
+  // Start a write.
+  static const size_t DWR_RECORD_SIZE = 10;
+  void* record_written = census_log_start_write(DWR_RECORD_SIZE);
+  GPR_ASSERT(record_written != NULL);
+  census_log_end_write(record_written, DWR_RECORD_SIZE);
+  // Read this record.
+  census_log_init_reader();
+  size_t bytes_available;
+  const void* record_read = census_log_read_next(&bytes_available);
+  GPR_ASSERT(record_read != NULL);
+  GPR_ASSERT(DWR_RECORD_SIZE == bytes_available);
+  // Now fill the log. This will move the block being read from core-local
+  // array to the dirty list.
+  while ((record_written = census_log_start_write(DWR_RECORD_SIZE))) {
+    census_log_end_write(record_written, DWR_RECORD_SIZE);
+  }
+
+  // In this iteration, read_next() should only traverse blocks in the
+  // core-local array. Therefore, we expect at most gpr_cpu_num_cores() more
+  // blocks. As log is full, if read_next() is traversing the dirty list, we
+  // will get more than gpr_cpu_num_cores() blocks.
+  int block_read = 0;
+  while ((record_read = census_log_read_next(&bytes_available))) {
+    ++block_read;
+    GPR_ASSERT(block_read <= (int)gpr_cpu_num_cores());
+  }
+  census_log_shutdown();
+}
+
+// Fills non-circular log with records sized such that size is a multiple of
+// CENSUS_LOG_MAX_RECORD_SIZE (no per-block fragmentation).
+void test_fill_log_no_fragmentation(void) {
+  printf("Starting test: fill log no fragmentation\n");
+  const int circular = 0;
+  setup_test(circular);
+  fill_log(LOG_SIZE_IN_BYTES, 1 /* no fragmentation */, circular);
+  census_log_shutdown();
+}
+
+// Fills circular log with records sized such that size is a multiple of
+// CENSUS_LOG_MAX_RECORD_SIZE (no per-block fragmentation).
+void test_fill_circular_log_no_fragmentation(void) {
+  printf("Starting test: fill circular log no fragmentation\n");
+  const int circular = 1;
+  setup_test(circular);
+  fill_log(LOG_SIZE_IN_BYTES, 1 /* no fragmentation */, circular);
+  census_log_shutdown();
+}
+
+// Fills non-circular log with records that may straddle end of a block.
+void test_fill_log_with_straddling_records(void) {
+  printf("Starting test: fill log with straddling records\n");
+  const int circular = 0;
+  setup_test(circular);
+  fill_log(LOG_SIZE_IN_BYTES, 0 /* block straddling records */, circular);
+  census_log_shutdown();
+}
+
+// Fills circular log with records that may straddle end of a block.
+void test_fill_circular_log_with_straddling_records(void) {
+  printf("Starting test: fill circular log with straddling records\n");
+  const int circular = 1;
+  setup_test(circular);
+  fill_log(LOG_SIZE_IN_BYTES, 0 /* block straddling records */, circular);
+  census_log_shutdown();
+}
+
+// Tests scenario where multiple writers and a single reader are using a log
+// that is configured to discard old records.
+void test_multiple_writers_circular_log(void) {
+  printf("Starting test: multiple writers circular log\n");
+  const int circular = 1;
+  setup_test(circular);
+  multiple_writers_single_reader(circular);
+  census_log_shutdown();
+}
+
+// Tests scenario where multiple writers and a single reader are using a log
+// that is configured to discard old records.
+void test_multiple_writers(void) {
+  printf("Starting test: multiple writers\n");
+  const int circular = 0;
+  setup_test(circular);
+  multiple_writers_single_reader(circular);
+  census_log_shutdown();
+}
+
+// Repeat the straddling records and multiple writers tests with a small log.
+void test_small_log(void) {
+  printf("Starting test: small log\n");
+  const int circular = 0;
+  census_log_initialize(0, circular);
+  size_t log_size = census_log_remaining_space();
+  GPR_ASSERT(log_size > 0);
+  fill_log(log_size, 0, circular);
+  census_log_shutdown();
+  census_log_initialize(0, circular);
+  multiple_writers_single_reader(circular);
+  census_log_shutdown();
+}
+
+void test_performance(void) {
+  for (size_t write_size = 1; write_size < CENSUS_LOG_MAX_RECORD_SIZE;
+       write_size *= 2) {
+    setup_test(0);
+    gpr_timespec start_time = gpr_now(GPR_CLOCK_REALTIME);
+    int nrecords = 0;
+    while (1) {
+      void* record = census_log_start_write(write_size);
+      if (record == NULL) {
+        break;
+      }
+      census_log_end_write(record, write_size);
+      nrecords++;
+    }
+    gpr_timespec write_time =
+        gpr_time_sub(gpr_now(GPR_CLOCK_REALTIME), start_time);
+    double write_time_micro =
+        (double)write_time.tv_sec * 1000000 + (double)write_time.tv_nsec / 1000;
+    census_log_shutdown();
+    printf(
+        "Wrote %d %d byte records in %.3g microseconds: %g records/us "
+        "(%g ns/record), %g gigabytes/s\n",
+        nrecords, (int)write_size, write_time_micro,
+        nrecords / write_time_micro, 1000 * write_time_micro / nrecords,
+        (double)((int)write_size * nrecords) / write_time_micro / 1000);
+  }
+}
+
+int main(int argc, char** argv) {
+  grpc_test_init(argc, argv);
+  gpr_time_init();
+  srand((unsigned)gpr_now(GPR_CLOCK_REALTIME).tv_nsec);
+  test_invalid_record_size();
+  test_end_write_with_different_size();
+  test_read_pending_record();
+  test_read_beyond_pending_record();
+  test_detached_while_reading();
+  test_fill_log_no_fragmentation();
+  test_fill_circular_log_no_fragmentation();
+  test_fill_log_with_straddling_records();
+  test_fill_circular_log_with_straddling_records();
+  test_small_log();
+  test_multiple_writers();
+  test_multiple_writers_circular_log();
+  test_performance();
+  return 0;
+}
diff --git a/test/core/end2end/gen_build_yaml.py b/test/core/end2end/gen_build_yaml.py
index d4fa7ab518..f24dbe72cf 100755
--- a/test/core/end2end/gen_build_yaml.py
+++ b/test/core/end2end/gen_build_yaml.py
@@ -152,11 +152,15 @@ def main():
   sec_deps = [
     'end2end_certs',
     'grpc_test_util',
-    'grpc'
+    'grpc',
+    'gpr_test_util',
+    'gpr'
   ]
   unsec_deps = [
     'grpc_test_util_unsecure',
-    'grpc_unsecure'
+    'grpc_unsecure',
+    'gpr_test_util',
+    'gpr'
   ]
   json = {
       '#': 'generated with test/end2end/gen_build_json.py',
diff --git a/test/core/fling/client.c b/test/core/fling/client.c
index 02db681cfd..b36aef3093 100644
--- a/test/core/fling/client.c
+++ b/test/core/fling/client.c
@@ -51,7 +51,7 @@ static grpc_channel *channel;
 static grpc_completion_queue *cq;
 static grpc_call *call;
 static grpc_op ops[6];
-static grpc_op stream_init_op;
+static grpc_op stream_init_ops[2];
 static grpc_op stream_step_ops[2];
 static grpc_metadata_array initial_metadata_recv;
 static grpc_metadata_array trailing_metadata_recv;
@@ -105,13 +105,17 @@ static void step_ping_pong_request(void) {
 }
 
 static void init_ping_pong_stream(void) {
+  grpc_metadata_array_init(&initial_metadata_recv);
+
   grpc_call_error error;
   call = grpc_channel_create_call(channel, NULL, GRPC_PROPAGATE_DEFAULTS, cq,
                                   "/Reflector/reflectStream", "localhost",
                                   gpr_inf_future(GPR_CLOCK_REALTIME), NULL);
-  stream_init_op.op = GRPC_OP_SEND_INITIAL_METADATA;
-  stream_init_op.data.send_initial_metadata.count = 0;
-  error = grpc_call_start_batch(call, &stream_init_op, 1, (void *)1, NULL);
+  stream_init_ops[0].op = GRPC_OP_SEND_INITIAL_METADATA;
+  stream_init_ops[0].data.send_initial_metadata.count = 0;
+  stream_init_ops[1].op = GRPC_OP_RECV_INITIAL_METADATA;
+  stream_init_ops[1].data.recv_initial_metadata = &initial_metadata_recv;
+  error = grpc_call_start_batch(call, stream_init_ops, 2, (void *)1, NULL);
   GPR_ASSERT(GRPC_CALL_OK == error);
   grpc_completion_queue_next(cq, gpr_inf_future(GPR_CLOCK_REALTIME), NULL);
 
diff --git a/test/core/iomgr/udp_server_test.c b/test/core/iomgr/udp_server_test.c
index 85e28732e4..2e253d8a8a 100644
--- a/test/core/iomgr/udp_server_test.c
+++ b/test/core/iomgr/udp_server_test.c
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -173,7 +173,7 @@ static void test_receive(int number_of_clients) {
   grpc_exec_ctx_finish(&exec_ctx);
 }
 
-static void destroy_pollset(grpc_exec_ctx *exec_ctx, void *p, int success) {
+static void destroy_pollset(grpc_exec_ctx *exec_ctx, void *p, bool success) {
   grpc_pollset_destroy(p);
 }
 
diff --git a/test/cpp/common/alarm_test.cc b/test/cpp/common/alarm_cpp_test.cc
index 09df6852a5..4745ef14ec 100644
--- a/test/cpp/common/alarm_test.cc
+++ b/test/cpp/common/alarm_cpp_test.cc
@@ -35,58 +35,47 @@
 #include <grpc++/completion_queue.h>
 #include <gtest/gtest.h>
 
-#include <grpc++/completion_queue.h>
 #include "test/core/util/test_config.h"
 
 namespace grpc {
 namespace {
 
-class TestTag : public CompletionQueueTag {
- public:
-  TestTag() : tag_(0) {}
-  TestTag(intptr_t tag) : tag_(tag) {}
-  bool FinalizeResult(void** tag, bool* status) { return true; }
-  intptr_t tag() { return tag_; }
-
- private:
-  intptr_t tag_;
-};
-
 TEST(AlarmTest, RegularExpiry) {
   CompletionQueue cq;
-  TestTag input_tag(1618033);
-  Alarm alarm(&cq, GRPC_TIMEOUT_SECONDS_TO_DEADLINE(1), &input_tag);
+  void* junk = reinterpret_cast<void*>(1618033);
+  Alarm alarm(&cq, GRPC_TIMEOUT_SECONDS_TO_DEADLINE(1), junk);
 
-  TestTag* output_tag;
+  void* output_tag;
   bool ok;
   const CompletionQueue::NextStatus status = cq.AsyncNext(
       (void**)&output_tag, &ok, GRPC_TIMEOUT_SECONDS_TO_DEADLINE(2));
 
   EXPECT_EQ(status, CompletionQueue::GOT_EVENT);
   EXPECT_TRUE(ok);
-  EXPECT_EQ(output_tag->tag(), input_tag.tag());
+  EXPECT_EQ(junk, output_tag);
 }
 
 TEST(AlarmTest, Cancellation) {
   CompletionQueue cq;
-  TestTag input_tag(1618033);
-  Alarm alarm(&cq, GRPC_TIMEOUT_SECONDS_TO_DEADLINE(2), &input_tag);
+  void* junk = reinterpret_cast<void*>(1618033);
+  Alarm alarm(&cq, GRPC_TIMEOUT_SECONDS_TO_DEADLINE(2), junk);
   alarm.Cancel();
 
-  TestTag* output_tag;
+  void* output_tag;
   bool ok;
   const CompletionQueue::NextStatus status = cq.AsyncNext(
       (void**)&output_tag, &ok, GRPC_TIMEOUT_SECONDS_TO_DEADLINE(1));
 
   EXPECT_EQ(status, CompletionQueue::GOT_EVENT);
   EXPECT_FALSE(ok);
-  EXPECT_EQ(output_tag->tag(), input_tag.tag());
+  EXPECT_EQ(junk, output_tag);
 }
 
 }  // namespace
 }  // namespace grpc
 
 int main(int argc, char** argv) {
+  grpc_test_init(argc, argv);
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
 }
diff --git a/test/cpp/end2end/async_end2end_test.cc b/test/cpp/end2end/async_end2end_test.cc
index 252bda3798..a194c615cd 100644
--- a/test/cpp/end2end/async_end2end_test.cc
+++ b/test/cpp/end2end/async_end2end_test.cc
@@ -479,8 +479,10 @@ TEST_P(AsyncEnd2endTest, ClientInitialMetadataRpc) {
   send_request.set_message("Hello");
   std::pair<grpc::string, grpc::string> meta1("key1", "val1");
   std::pair<grpc::string, grpc::string> meta2("key2", "val2");
+  std::pair<grpc::string, grpc::string> meta3("g.r.d-bin", "xyz");
   cli_ctx.AddMetadata(meta1.first, meta1.second);
   cli_ctx.AddMetadata(meta2.first, meta2.second);
+  cli_ctx.AddMetadata(meta3.first, meta3.second);
 
   std::unique_ptr<ClientAsyncResponseReader<EchoResponse>> response_reader(
       stub_->AsyncEcho(&cli_ctx, send_request, cq_.get()));
@@ -494,6 +496,8 @@ TEST_P(AsyncEnd2endTest, ClientInitialMetadataRpc) {
             ToString(client_initial_metadata.find(meta1.first)->second));
   EXPECT_EQ(meta2.second,
             ToString(client_initial_metadata.find(meta2.first)->second));
+  EXPECT_EQ(meta3.second,
+            ToString(client_initial_metadata.find(meta3.first)->second));
   EXPECT_GE(client_initial_metadata.size(), static_cast<size_t>(2));
 
   send_response.set_message(recv_request.message());
diff --git a/test/cpp/qps/client.h b/test/cpp/qps/client.h
index 50b2bf2514..c94a523fa1 100644
--- a/test/cpp/qps/client.h
+++ b/test/cpp/qps/client.h
@@ -41,6 +41,7 @@
 #include <grpc++/support/byte_buffer.h>
 #include <grpc++/support/slice.h>
 #include <grpc/support/log.h>
+#include <grpc/support/time.h>
 
 #include "src/proto/grpc/testing/payloads.grpc.pb.h"
 #include "src/proto/grpc/testing/services.grpc.pb.h"
@@ -52,27 +53,8 @@
 #include "test/cpp/util/create_test_channel.h"
 
 namespace grpc {
-
-#if defined(__APPLE__)
-// Specialize Timepoint for high res clock as we need that
-template <>
-class TimePoint<std::chrono::high_resolution_clock::time_point> {
- public:
-  TimePoint(const std::chrono::high_resolution_clock::time_point& time) {
-    TimepointHR2Timespec(time, &time_);
-  }
-  gpr_timespec raw_time() const { return time_; }
-
- private:
-  gpr_timespec time_;
-};
-#endif
-
 namespace testing {
 
-typedef std::chrono::high_resolution_clock grpc_time_source;
-typedef std::chrono::time_point<grpc_time_source> grpc_time;
-
 template <class RequestType>
 class ClientRequestCreator {
  public:
@@ -184,7 +166,7 @@ class Client {
     // Set up the load distribution based on the number of threads
     const auto& load = config.load_params();
 
-    std::unique_ptr<RandomDist> random_dist;
+    std::unique_ptr<RandomDistInterface> random_dist;
     switch (load.load_case()) {
       case LoadParams::kClosedLoop:
         // Closed-loop doesn't use random dist at all
@@ -218,25 +200,26 @@ class Client {
       closed_loop_ = false;
       // set up interarrival timer according to random dist
       interarrival_timer_.init(*random_dist, num_threads);
+      const auto now = gpr_now(GPR_CLOCK_MONOTONIC);
       for (size_t i = 0; i < num_threads; i++) {
-        next_time_.push_back(
-            grpc_time_source::now() +
-            std::chrono::duration_cast<grpc_time_source::duration>(
-                interarrival_timer_(i)));
+        next_time_.push_back(gpr_time_add(
+            now,
+            gpr_time_from_nanos(interarrival_timer_.next(i), GPR_TIMESPAN)));
       }
     }
   }
 
-  bool NextIssueTime(int thread_idx, grpc_time* time_delay) {
-    if (closed_loop_) {
-      return false;
-    } else {
-      *time_delay = next_time_[thread_idx];
-      next_time_[thread_idx] +=
-          std::chrono::duration_cast<grpc_time_source::duration>(
-              interarrival_timer_(thread_idx));
-      return true;
-    }
+  gpr_timespec NextIssueTime(int thread_idx) {
+    const gpr_timespec result = next_time_[thread_idx];
+    next_time_[thread_idx] =
+        gpr_time_add(next_time_[thread_idx],
+                     gpr_time_from_nanos(interarrival_timer_.next(thread_idx),
+                                         GPR_TIMESPAN));
+    return result;
+  }
+  std::function<gpr_timespec()> NextIssuer(int thread_idx) {
+    return closed_loop_ ? std::function<gpr_timespec()>()
+                        : std::bind(&Client::NextIssueTime, this, thread_idx);
   }
 
  private:
@@ -306,7 +289,7 @@ class Client {
     Histogram* new_stats_;
     Histogram histogram_;
     Client* client_;
-    size_t idx_;
+    const size_t idx_;
     std::thread impl_;
   };
 
@@ -314,7 +297,7 @@ class Client {
   std::unique_ptr<Timer> timer_;
 
   InterarrivalTimer interarrival_timer_;
-  std::vector<grpc_time> next_time_;
+  std::vector<gpr_timespec> next_time_;
 };
 
 template <class StubType, class RequestType>
@@ -323,9 +306,9 @@ class ClientImpl : public Client {
   ClientImpl(const ClientConfig& config,
              std::function<std::unique_ptr<StubType>(std::shared_ptr<Channel>)>
                  create_stub)
-      : channels_(config.client_channels()), create_stub_(create_stub) {
-    cores_ = LimitCores(config.core_list().data(), config.core_list_size());
-
+      : cores_(LimitCores(config.core_list().data(), config.core_list_size())),
+        channels_(config.client_channels()),
+        create_stub_(create_stub) {
     for (int i = 0; i < config.client_channels(); i++) {
       channels_[i].init(config.server_targets(i % config.server_targets_size()),
                         config, create_stub_);
@@ -337,7 +320,7 @@ class ClientImpl : public Client {
   virtual ~ClientImpl() {}
 
  protected:
-  int cores_;
+  const int cores_;
   RequestType request_;
 
   class ClientChannelInfo {
diff --git a/test/cpp/qps/client_async.cc b/test/cpp/qps/client_async.cc
index f3f8f37051..9e8767d103 100644
--- a/test/cpp/qps/client_async.cc
+++ b/test/cpp/qps/client_async.cc
@@ -43,9 +43,9 @@
 #include <vector>
 
 #include <gflags/gflags.h>
+#include <grpc++/alarm.h>
 #include <grpc++/channel.h>
 #include <grpc++/client_context.h>
-#include <grpc++/client_context.h>
 #include <grpc++/generic/generic_stub.h>
 #include <grpc/grpc.h>
 #include <grpc/support/cpu.h>
@@ -60,11 +60,9 @@
 namespace grpc {
 namespace testing {
 
-typedef std::list<grpc_time> deadline_list;
-
 class ClientRpcContext {
  public:
-  explicit ClientRpcContext(int ch) : channel_id_(ch) {}
+  ClientRpcContext() {}
   virtual ~ClientRpcContext() {}
   // next state, return false if done. Collect stats when appropriate
   virtual bool RunNextState(bool, Histogram* hist) = 0;
@@ -74,72 +72,73 @@ class ClientRpcContext {
     return reinterpret_cast<ClientRpcContext*>(t);
   }
 
-  deadline_list::iterator deadline_posn() const { return deadline_posn_; }
-  void set_deadline_posn(const deadline_list::iterator& it) {
-    deadline_posn_ = it;
-  }
   virtual void Start(CompletionQueue* cq) = 0;
-  int channel_id() const { return channel_id_; }
-
- protected:
-  int channel_id_;
-
- private:
-  deadline_list::iterator deadline_posn_;
 };
 
 template <class RequestType, class ResponseType>
 class ClientRpcContextUnaryImpl : public ClientRpcContext {
  public:
   ClientRpcContextUnaryImpl(
-      int channel_id, BenchmarkService::Stub* stub, const RequestType& req,
+      BenchmarkService::Stub* stub, const RequestType& req,
+      std::function<gpr_timespec()> next_issue,
       std::function<
           std::unique_ptr<grpc::ClientAsyncResponseReader<ResponseType>>(
               BenchmarkService::Stub*, grpc::ClientContext*, const RequestType&,
               CompletionQueue*)> start_req,
       std::function<void(grpc::Status, ResponseType*)> on_done)
-      : ClientRpcContext(channel_id),
-        context_(),
+      : context_(),
         stub_(stub),
+        cq_(nullptr),
         req_(req),
         response_(),
-        next_state_(&ClientRpcContextUnaryImpl::RespDone),
+        next_state_(State::READY),
         callback_(on_done),
+        next_issue_(next_issue),
         start_req_(start_req) {}
+  ~ClientRpcContextUnaryImpl() GRPC_OVERRIDE {}
   void Start(CompletionQueue* cq) GRPC_OVERRIDE {
-    start_ = Timer::Now();
-    response_reader_ = start_req_(stub_, &context_, req_, cq);
-    response_reader_->Finish(&response_, &status_, ClientRpcContext::tag(this));
+    cq_ = cq;
+    if (!next_issue_) {  // ready to issue
+      RunNextState(true, nullptr);
+    } else {  // wait for the issue time
+      alarm_.reset(new Alarm(cq_, next_issue_(), ClientRpcContext::tag(this)));
+    }
   }
-  ~ClientRpcContextUnaryImpl() GRPC_OVERRIDE {}
   bool RunNextState(bool ok, Histogram* hist) GRPC_OVERRIDE {
-    bool ret = (this->*next_state_)(ok);
-    if (!ret) {
-      hist->Add((Timer::Now() - start_) * 1e9);
+    switch (next_state_) {
+      case State::READY:
+        start_ = Timer::Now();
+        response_reader_ = start_req_(stub_, &context_, req_, cq_);
+        response_reader_->Finish(&response_, &status_,
+                                 ClientRpcContext::tag(this));
+        next_state_ = State::RESP_DONE;
+        return true;
+      case State::RESP_DONE:
+        hist->Add((Timer::Now() - start_) * 1e9);
+        callback_(status_, &response_);
+        next_state_ = State::INVALID;
+        return false;
+      default:
+        GPR_ASSERT(false);
+        return false;
     }
-    return ret;
   }
-
   ClientRpcContext* StartNewClone() GRPC_OVERRIDE {
-    return new ClientRpcContextUnaryImpl(channel_id_, stub_, req_, start_req_,
+    return new ClientRpcContextUnaryImpl(stub_, req_, next_issue_, start_req_,
                                          callback_);
   }
 
  private:
-  bool RespDone(bool) {
-    next_state_ = &ClientRpcContextUnaryImpl::DoCallBack;
-    return false;
-  }
-  bool DoCallBack(bool) {
-    callback_(status_, &response_);
-    return true;  // we're done, this'll be ignored
-  }
   grpc::ClientContext context_;
   BenchmarkService::Stub* stub_;
+  CompletionQueue* cq_;
+  std::unique_ptr<Alarm> alarm_;
   RequestType req_;
   ResponseType response_;
-  bool (ClientRpcContextUnaryImpl::*next_state_)(bool);
+  enum State { INVALID, READY, RESP_DONE };
+  State next_state_;
   std::function<void(grpc::Status, ResponseType*)> callback_;
+  std::function<gpr_timespec()> next_issue_;
   std::function<std::unique_ptr<grpc::ClientAsyncResponseReader<ResponseType>>(
       BenchmarkService::Stub*, grpc::ClientContext*, const RequestType&,
       CompletionQueue*)> start_req_;
@@ -157,49 +156,35 @@ class AsyncClient : public ClientImpl<StubType, RequestType> {
   // member name resolution until the template types are fully resolved
  public:
   using Client::SetupLoadTest;
-  using Client::NextIssueTime;
   using Client::closed_loop_;
+  using Client::NextIssuer;
   using ClientImpl<StubType, RequestType>::cores_;
   using ClientImpl<StubType, RequestType>::channels_;
   using ClientImpl<StubType, RequestType>::request_;
   AsyncClient(const ClientConfig& config,
-              std::function<ClientRpcContext*(int, StubType*,
-                                              const RequestType&)> setup_ctx,
+              std::function<ClientRpcContext*(
+                  StubType*, std::function<gpr_timespec()> next_issue,
+                  const RequestType&)> setup_ctx,
               std::function<std::unique_ptr<StubType>(std::shared_ptr<Channel>)>
                   create_stub)
       : ClientImpl<StubType, RequestType>(config, create_stub),
-        num_async_threads_(NumThreads(config)),
-        channel_lock_(new std::mutex[config.client_channels()]),
-        contexts_(config.client_channels()),
-        max_outstanding_per_channel_(config.outstanding_rpcs_per_channel()),
-        channel_count_(config.client_channels()),
-        pref_channel_inc_(num_async_threads_) {
+        num_async_threads_(NumThreads(config)) {
     SetupLoadTest(config, num_async_threads_);
 
     for (int i = 0; i < num_async_threads_; i++) {
       cli_cqs_.emplace_back(new CompletionQueue);
-      if (!closed_loop_) {
-        rpc_deadlines_.emplace_back();
-        next_channel_.push_back(i % channel_count_);
-        issue_allowed_.emplace_back(true);
-
-        grpc_time next_issue;
-        NextIssueTime(i, &next_issue);
-        next_issue_.push_back(next_issue);
-      }
+      next_issuers_.emplace_back(NextIssuer(i));
     }
 
+    using namespace std::placeholders;
     int t = 0;
     for (int i = 0; i < config.outstanding_rpcs_per_channel(); i++) {
-      for (int ch = 0; ch < channel_count_; ch++) {
+      for (int ch = 0; ch < config.client_channels(); ch++) {
         auto* cq = cli_cqs_[t].get();
+        auto ctx =
+            setup_ctx(channels_[ch].get_stub(), next_issuers_[t], request_);
+        ctx->Start(cq);
         t = (t + 1) % cli_cqs_.size();
-        auto ctx = setup_ctx(ch, channels_[ch].get_stub(), request_);
-        if (closed_loop_) {
-          ctx->Start(cq);
-        } else {
-          contexts_[ch].push_front(ctx);
-        }
       }
     }
   }
@@ -212,140 +197,34 @@ class AsyncClient : public ClientImpl<StubType, RequestType> {
         delete ClientRpcContext::detag(got_tag);
       }
     }
-    // Now clear out all the pre-allocated idle contexts
-    for (int ch = 0; ch < channel_count_; ch++) {
-      while (!contexts_[ch].empty()) {
-        // Get an idle context from the front of the list
-        auto* ctx = *(contexts_[ch].begin());
-        contexts_[ch].pop_front();
-        delete ctx;
-      }
-    }
-    delete[] channel_lock_;
   }
 
   bool ThreadFunc(Histogram* histogram,
                   size_t thread_idx) GRPC_OVERRIDE GRPC_FINAL {
     void* got_tag;
     bool ok;
-    grpc_time deadline, short_deadline;
-    if (closed_loop_) {
-      deadline = grpc_time_source::now() + std::chrono::seconds(1);
-      short_deadline = deadline;
-    } else {
-      if (rpc_deadlines_[thread_idx].empty()) {
-        deadline = grpc_time_source::now() + std::chrono::seconds(1);
-      } else {
-        deadline = *(rpc_deadlines_[thread_idx].begin());
-      }
-      short_deadline =
-          issue_allowed_[thread_idx] ? next_issue_[thread_idx] : deadline;
-    }
-
-    bool got_event;
 
-    switch (cli_cqs_[thread_idx]->AsyncNext(&got_tag, &ok, short_deadline)) {
-      case CompletionQueue::SHUTDOWN:
-        return false;
-      case CompletionQueue::TIMEOUT:
-        got_event = false;
-        break;
-      case CompletionQueue::GOT_EVENT:
-        got_event = true;
-        break;
-      default:
-        GPR_ASSERT(false);
-        break;
-    }
-    if (got_event) {
+    if (cli_cqs_[thread_idx]->Next(&got_tag, &ok)) {
+      // Got a regular event, so process it
       ClientRpcContext* ctx = ClientRpcContext::detag(got_tag);
-      if (ctx->RunNextState(ok, histogram) == false) {
-        // call the callback and then clone the ctx
-        ctx->RunNextState(ok, histogram);
-        ClientRpcContext* clone_ctx = ctx->StartNewClone();
-        if (closed_loop_) {
-          clone_ctx->Start(cli_cqs_[thread_idx].get());
-        } else {
-          // Remove the entry from the rpc deadlines list
-          rpc_deadlines_[thread_idx].erase(ctx->deadline_posn());
-          // Put the clone_ctx in the list of idle contexts for this channel
-          // Under lock
-          int ch = clone_ctx->channel_id();
-          std::lock_guard<std::mutex> g(channel_lock_[ch]);
-          contexts_[ch].push_front(clone_ctx);
-        }
+      if (!ctx->RunNextState(ok, histogram)) {
+        // The RPC and callback are done, so clone the ctx
+        // and kickstart the new one
+        auto clone = ctx->StartNewClone();
+        clone->Start(cli_cqs_[thread_idx].get());
         // delete the old version
         delete ctx;
       }
-      if (!closed_loop_)
-        issue_allowed_[thread_idx] =
-            true;  // may be ok now even if it hadn't been
+      return true;
+    } else {  // queue is shutting down
+      return false;
     }
-    if (!closed_loop_ && issue_allowed_[thread_idx] &&
-        grpc_time_source::now() >= next_issue_[thread_idx]) {
-      // Attempt to issue
-      bool issued = false;
-      for (int num_attempts = 0, channel_attempt = next_channel_[thread_idx];
-           num_attempts < channel_count_ && !issued; num_attempts++) {
-        bool can_issue = false;
-        ClientRpcContext* ctx = nullptr;
-        {
-          std::lock_guard<std::mutex> g(channel_lock_[channel_attempt]);
-          if (!contexts_[channel_attempt].empty()) {
-            // Get an idle context from the front of the list
-            ctx = *(contexts_[channel_attempt].begin());
-            contexts_[channel_attempt].pop_front();
-            can_issue = true;
-          }
-        }
-        if (can_issue) {
-          // do the work to issue
-          rpc_deadlines_[thread_idx].emplace_back(grpc_time_source::now() +
-                                                  std::chrono::seconds(1));
-          auto it = rpc_deadlines_[thread_idx].end();
-          --it;
-          ctx->set_deadline_posn(it);
-          ctx->Start(cli_cqs_[thread_idx].get());
-          issued = true;
-          // If we did issue, then next time, try our thread's next
-          // preferred channel
-          next_channel_[thread_idx] += pref_channel_inc_;
-          if (next_channel_[thread_idx] >= channel_count_)
-            next_channel_[thread_idx] = (thread_idx % channel_count_);
-        } else {
-          // Do a modular increment of channel attempt if we couldn't issue
-          channel_attempt = (channel_attempt + 1) % channel_count_;
-        }
-      }
-      if (issued) {
-        // We issued one; see when we can issue the next
-        grpc_time next_issue;
-        NextIssueTime(thread_idx, &next_issue);
-        next_issue_[thread_idx] = next_issue;
-      } else {
-        issue_allowed_[thread_idx] = false;
-      }
-    }
-    return true;
   }
 
  protected:
-  int num_async_threads_;
+  const int num_async_threads_;
 
  private:
-  class boolean {  // exists only to avoid data-race on vector<bool>
-   public:
-    boolean() : val_(false) {}
-    boolean(bool b) : val_(b) {}
-    operator bool() const { return val_; }
-    boolean& operator=(bool b) {
-      val_ = b;
-      return *this;
-    }
-
-   private:
-    bool val_;
-  };
   int NumThreads(const ClientConfig& config) {
     int num_threads = config.async_client_threads();
     if (num_threads <= 0) {  // Use dynamic sizing
@@ -356,18 +235,7 @@ class AsyncClient : public ClientImpl<StubType, RequestType> {
   }
 
   std::vector<std::unique_ptr<CompletionQueue>> cli_cqs_;
-
-  std::vector<deadline_list> rpc_deadlines_;  // per thread deadlines
-  std::vector<int> next_channel_;       // per thread round-robin channel ctr
-  std::vector<boolean> issue_allowed_;  // may this thread attempt to issue
-  std::vector<grpc_time> next_issue_;   // when should it issue?
-
-  std::mutex*
-      channel_lock_;  // a vector, but avoid std::vector for old compilers
-  std::vector<context_list> contexts_;  // per-channel list of idle contexts
-  int max_outstanding_per_channel_;
-  int channel_count_;
-  int pref_channel_inc_;
+  std::vector<std::function<gpr_timespec()>> next_issuers_;
 };
 
 static std::unique_ptr<BenchmarkService::Stub> BenchmarkStubCreator(
@@ -391,11 +259,11 @@ class AsyncUnaryClient GRPC_FINAL
            const SimpleRequest& request, CompletionQueue* cq) {
     return stub->AsyncUnaryCall(ctx, request, cq);
   };
-  static ClientRpcContext* SetupCtx(int channel_id,
-                                    BenchmarkService::Stub* stub,
+  static ClientRpcContext* SetupCtx(BenchmarkService::Stub* stub,
+                                    std::function<gpr_timespec()> next_issue,
                                     const SimpleRequest& req) {
     return new ClientRpcContextUnaryImpl<SimpleRequest, SimpleResponse>(
-        channel_id, stub, req, AsyncUnaryClient::StartReq,
+        stub, req, next_issue, AsyncUnaryClient::StartReq,
         AsyncUnaryClient::CheckDone);
   }
 };
@@ -404,62 +272,94 @@ template <class RequestType, class ResponseType>
 class ClientRpcContextStreamingImpl : public ClientRpcContext {
  public:
   ClientRpcContextStreamingImpl(
-      int channel_id, BenchmarkService::Stub* stub, const RequestType& req,
+      BenchmarkService::Stub* stub, const RequestType& req,
+      std::function<gpr_timespec()> next_issue,
       std::function<std::unique_ptr<
           grpc::ClientAsyncReaderWriter<RequestType, ResponseType>>(
           BenchmarkService::Stub*, grpc::ClientContext*, CompletionQueue*,
           void*)> start_req,
       std::function<void(grpc::Status, ResponseType*)> on_done)
-      : ClientRpcContext(channel_id),
-        context_(),
+      : context_(),
         stub_(stub),
+        cq_(nullptr),
         req_(req),
         response_(),
-        next_state_(&ClientRpcContextStreamingImpl::ReqSent),
+        next_state_(State::INVALID),
         callback_(on_done),
+        next_issue_(next_issue),
         start_req_(start_req),
         start_(Timer::Now()) {}
   ~ClientRpcContextStreamingImpl() GRPC_OVERRIDE {}
+  void Start(CompletionQueue* cq) GRPC_OVERRIDE {
+    cq_ = cq;
+    stream_ = start_req_(stub_, &context_, cq, ClientRpcContext::tag(this));
+    next_state_ = State::STREAM_IDLE;
+  }
   bool RunNextState(bool ok, Histogram* hist) GRPC_OVERRIDE {
-    return (this->*next_state_)(ok, hist);
+    while (true) {
+      switch (next_state_) {
+        case State::STREAM_IDLE:
+          if (!next_issue_) {  // ready to issue
+            next_state_ = State::READY_TO_WRITE;
+          } else {
+            next_state_ = State::WAIT;
+          }
+          break;  // loop around, don't return
+        case State::WAIT:
+          alarm_.reset(
+              new Alarm(cq_, next_issue_(), ClientRpcContext::tag(this)));
+          next_state_ = State::READY_TO_WRITE;
+          return true;
+        case State::READY_TO_WRITE:
+          if (!ok) {
+            return false;
+          }
+          start_ = Timer::Now();
+          next_state_ = State::WRITE_DONE;
+          stream_->Write(req_, ClientRpcContext::tag(this));
+          return true;
+        case State::WRITE_DONE:
+          if (!ok) {
+            return false;
+          }
+          next_state_ = State::READ_DONE;
+          stream_->Read(&response_, ClientRpcContext::tag(this));
+          return true;
+          break;
+        case State::READ_DONE:
+          hist->Add((Timer::Now() - start_) * 1e9);
+          callback_(status_, &response_);
+          next_state_ = State::STREAM_IDLE;
+          break;  // loop around
+        default:
+          GPR_ASSERT(false);
+          return false;
+      }
+    }
   }
   ClientRpcContext* StartNewClone() GRPC_OVERRIDE {
-    return new ClientRpcContextStreamingImpl(channel_id_, stub_, req_,
+    return new ClientRpcContextStreamingImpl(stub_, req_, next_issue_,
                                              start_req_, callback_);
   }
-  void Start(CompletionQueue* cq) GRPC_OVERRIDE {
-    stream_ = start_req_(stub_, &context_, cq, ClientRpcContext::tag(this));
-  }
 
  private:
-  bool ReqSent(bool ok, Histogram*) { return StartWrite(ok); }
-  bool StartWrite(bool ok) {
-    if (!ok) {
-      return (false);
-    }
-    start_ = Timer::Now();
-    next_state_ = &ClientRpcContextStreamingImpl::WriteDone;
-    stream_->Write(req_, ClientRpcContext::tag(this));
-    return true;
-  }
-  bool WriteDone(bool ok, Histogram*) {
-    if (!ok) {
-      return (false);
-    }
-    next_state_ = &ClientRpcContextStreamingImpl::ReadDone;
-    stream_->Read(&response_, ClientRpcContext::tag(this));
-    return true;
-  }
-  bool ReadDone(bool ok, Histogram* hist) {
-    hist->Add((Timer::Now() - start_) * 1e9);
-    return StartWrite(ok);
-  }
   grpc::ClientContext context_;
   BenchmarkService::Stub* stub_;
+  CompletionQueue* cq_;
+  std::unique_ptr<Alarm> alarm_;
   RequestType req_;
   ResponseType response_;
-  bool (ClientRpcContextStreamingImpl::*next_state_)(bool, Histogram*);
+  enum State {
+    INVALID,
+    STREAM_IDLE,
+    WAIT,
+    READY_TO_WRITE,
+    WRITE_DONE,
+    READ_DONE
+  };
+  State next_state_;
   std::function<void(grpc::Status, ResponseType*)> callback_;
+  std::function<gpr_timespec()> next_issue_;
   std::function<
       std::unique_ptr<grpc::ClientAsyncReaderWriter<RequestType, ResponseType>>(
           BenchmarkService::Stub*, grpc::ClientContext*, CompletionQueue*,
@@ -475,9 +375,6 @@ class AsyncStreamingClient GRPC_FINAL
  public:
   explicit AsyncStreamingClient(const ClientConfig& config)
       : AsyncClient(config, SetupCtx, BenchmarkStubCreator) {
-    // async streaming currently only supports closed loop
-    GPR_ASSERT(closed_loop_);
-
     StartThreads(num_async_threads_);
   }
 
@@ -492,11 +389,11 @@ class AsyncStreamingClient GRPC_FINAL
     auto stream = stub->AsyncStreamingCall(ctx, cq, tag);
     return stream;
   };
-  static ClientRpcContext* SetupCtx(int channel_id,
-                                    BenchmarkService::Stub* stub,
+  static ClientRpcContext* SetupCtx(BenchmarkService::Stub* stub,
+                                    std::function<gpr_timespec()> next_issue,
                                     const SimpleRequest& req) {
     return new ClientRpcContextStreamingImpl<SimpleRequest, SimpleResponse>(
-        channel_id, stub, req, AsyncStreamingClient::StartReq,
+        stub, req, next_issue, AsyncStreamingClient::StartReq,
         AsyncStreamingClient::CheckDone);
   }
 };
@@ -504,64 +401,96 @@ class AsyncStreamingClient GRPC_FINAL
 class ClientRpcContextGenericStreamingImpl : public ClientRpcContext {
  public:
   ClientRpcContextGenericStreamingImpl(
-      int channel_id, grpc::GenericStub* stub, const ByteBuffer& req,
+      grpc::GenericStub* stub, const ByteBuffer& req,
+      std::function<gpr_timespec()> next_issue,
       std::function<std::unique_ptr<grpc::GenericClientAsyncReaderWriter>(
           grpc::GenericStub*, grpc::ClientContext*,
           const grpc::string& method_name, CompletionQueue*, void*)> start_req,
       std::function<void(grpc::Status, ByteBuffer*)> on_done)
-      : ClientRpcContext(channel_id),
-        context_(),
+      : context_(),
         stub_(stub),
+        cq_(nullptr),
         req_(req),
         response_(),
-        next_state_(&ClientRpcContextGenericStreamingImpl::ReqSent),
+        next_state_(State::INVALID),
         callback_(on_done),
+        next_issue_(next_issue),
         start_req_(start_req),
         start_(Timer::Now()) {}
   ~ClientRpcContextGenericStreamingImpl() GRPC_OVERRIDE {}
-  bool RunNextState(bool ok, Histogram* hist) GRPC_OVERRIDE {
-    return (this->*next_state_)(ok, hist);
-  }
-  ClientRpcContext* StartNewClone() GRPC_OVERRIDE {
-    return new ClientRpcContextGenericStreamingImpl(channel_id_, stub_, req_,
-                                                    start_req_, callback_);
-  }
   void Start(CompletionQueue* cq) GRPC_OVERRIDE {
+    cq_ = cq;
     const grpc::string kMethodName(
         "/grpc.testing.BenchmarkService/StreamingCall");
     stream_ = start_req_(stub_, &context_, kMethodName, cq,
                          ClientRpcContext::tag(this));
+    next_state_ = State::STREAM_IDLE;
   }
-
- private:
-  bool ReqSent(bool ok, Histogram*) { return StartWrite(ok); }
-  bool StartWrite(bool ok) {
-    if (!ok) {
-      return (false);
-    }
-    start_ = Timer::Now();
-    next_state_ = &ClientRpcContextGenericStreamingImpl::WriteDone;
-    stream_->Write(req_, ClientRpcContext::tag(this));
-    return true;
-  }
-  bool WriteDone(bool ok, Histogram*) {
-    if (!ok) {
-      return (false);
+  bool RunNextState(bool ok, Histogram* hist) GRPC_OVERRIDE {
+    while (true) {
+      switch (next_state_) {
+        case State::STREAM_IDLE:
+          if (!next_issue_) {  // ready to issue
+            next_state_ = State::READY_TO_WRITE;
+          } else {
+            next_state_ = State::WAIT;
+          }
+          break;  // loop around, don't return
+        case State::WAIT:
+          alarm_.reset(
+              new Alarm(cq_, next_issue_(), ClientRpcContext::tag(this)));
+          next_state_ = State::READY_TO_WRITE;
+          return true;
+        case State::READY_TO_WRITE:
+          if (!ok) {
+            return false;
+          }
+          start_ = Timer::Now();
+          next_state_ = State::WRITE_DONE;
+          stream_->Write(req_, ClientRpcContext::tag(this));
+          return true;
+        case State::WRITE_DONE:
+          if (!ok) {
+            return false;
+          }
+          next_state_ = State::READ_DONE;
+          stream_->Read(&response_, ClientRpcContext::tag(this));
+          return true;
+          break;
+        case State::READ_DONE:
+          hist->Add((Timer::Now() - start_) * 1e9);
+          callback_(status_, &response_);
+          next_state_ = State::STREAM_IDLE;
+          break;  // loop around
+        default:
+          GPR_ASSERT(false);
+          return false;
+      }
     }
-    next_state_ = &ClientRpcContextGenericStreamingImpl::ReadDone;
-    stream_->Read(&response_, ClientRpcContext::tag(this));
-    return true;
   }
-  bool ReadDone(bool ok, Histogram* hist) {
-    hist->Add((Timer::Now() - start_) * 1e9);
-    return StartWrite(ok);
+  ClientRpcContext* StartNewClone() GRPC_OVERRIDE {
+    return new ClientRpcContextGenericStreamingImpl(stub_, req_, next_issue_,
+                                                    start_req_, callback_);
   }
+
+ private:
   grpc::ClientContext context_;
   grpc::GenericStub* stub_;
+  CompletionQueue* cq_;
+  std::unique_ptr<Alarm> alarm_;
   ByteBuffer req_;
   ByteBuffer response_;
-  bool (ClientRpcContextGenericStreamingImpl::*next_state_)(bool, Histogram*);
+  enum State {
+    INVALID,
+    STREAM_IDLE,
+    WAIT,
+    READY_TO_WRITE,
+    WRITE_DONE,
+    READ_DONE
+  };
+  State next_state_;
   std::function<void(grpc::Status, ByteBuffer*)> callback_;
+  std::function<gpr_timespec()> next_issue_;
   std::function<std::unique_ptr<grpc::GenericClientAsyncReaderWriter>(
       grpc::GenericStub*, grpc::ClientContext*, const grpc::string&,
       CompletionQueue*, void*)> start_req_;
@@ -580,9 +509,6 @@ class GenericAsyncStreamingClient GRPC_FINAL
  public:
   explicit GenericAsyncStreamingClient(const ClientConfig& config)
       : AsyncClient(config, SetupCtx, GenericStubCreator) {
-    // async streaming currently only supports closed loop
-    GPR_ASSERT(closed_loop_);
-
     StartThreads(num_async_threads_);
   }
 
@@ -596,10 +522,11 @@ class GenericAsyncStreamingClient GRPC_FINAL
     auto stream = stub->Call(ctx, method_name, cq, tag);
     return stream;
   };
-  static ClientRpcContext* SetupCtx(int channel_id, grpc::GenericStub* stub,
+  static ClientRpcContext* SetupCtx(grpc::GenericStub* stub,
+                                    std::function<gpr_timespec()> next_issue,
                                     const ByteBuffer& req) {
     return new ClientRpcContextGenericStreamingImpl(
-        channel_id, stub, req, GenericAsyncStreamingClient::StartReq,
+        stub, req, next_issue, GenericAsyncStreamingClient::StartReq,
         GenericAsyncStreamingClient::CheckDone);
   }
 };
diff --git a/test/cpp/qps/client_sync.cc b/test/cpp/qps/client_sync.cc
index d93537b279..edfc246a25 100644
--- a/test/cpp/qps/client_sync.cc
+++ b/test/cpp/qps/client_sync.cc
@@ -84,11 +84,8 @@ class SynchronousClient
 
  protected:
   void WaitToIssue(int thread_idx) {
-    grpc_time next_time;
-    if (NextIssueTime(thread_idx, &next_time)) {
-      gpr_timespec next_timespec;
-      TimepointHR2Timespec(next_time, &next_timespec);
-      gpr_sleep_until(next_timespec);
+    if (!closed_loop_) {
+      gpr_sleep_until(NextIssueTime(thread_idx));
     }
   }
 
diff --git a/test/cpp/qps/driver.cc b/test/cpp/qps/driver.cc
index 80f6ada409..1c7fdf8796 100644
--- a/test/cpp/qps/driver.cc
+++ b/test/cpp/qps/driver.cc
@@ -197,9 +197,7 @@ std::unique_ptr<ScenarioResult> RunScenario(
   workers.resize(num_clients + num_servers);
 
   gpr_timespec deadline =
-      gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
-                   gpr_time_from_seconds(
-                       warmup_seconds + benchmark_seconds + 20, GPR_TIMESPAN));
+      GRPC_TIMEOUT_SECONDS_TO_DEADLINE(warmup_seconds + benchmark_seconds + 20);
 
   // Start servers
   using runsc::ServerData;
diff --git a/test/cpp/qps/interarrival.h b/test/cpp/qps/interarrival.h
index 841619e3ff..b6fd67b77c 100644
--- a/test/cpp/qps/interarrival.h
+++ b/test/cpp/qps/interarrival.h
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -51,15 +51,15 @@ namespace testing {
 // stacks. Thus, this code only uses a uniform distribution of doubles [0,1)
 // and then provides the distribution functions itself.
 
-class RandomDist {
+class RandomDistInterface {
  public:
-  RandomDist() {}
-  virtual ~RandomDist() = 0;
-  // Argument to operator() is a uniform double in the range [0,1)
-  virtual double operator()(double uni) const = 0;
+  RandomDistInterface() {}
+  virtual ~RandomDistInterface() = 0;
+  // Argument to transform is a uniform double in the range [0,1)
+  virtual double transform(double uni) const = 0;
 };
 
-inline RandomDist::~RandomDist() {}
+inline RandomDistInterface::~RandomDistInterface() {}
 
 // ExpDist implements an exponential distribution, which is the
 // interarrival distribution for a Poisson process. The parameter
@@ -69,11 +69,11 @@ inline RandomDist::~RandomDist() {}
 // independent identical stationary sources. For more information,
 // see http://en.wikipedia.org/wiki/Exponential_distribution
 
-class ExpDist GRPC_FINAL : public RandomDist {
+class ExpDist GRPC_FINAL : public RandomDistInterface {
  public:
   explicit ExpDist(double lambda) : lambda_recip_(1.0 / lambda) {}
   ~ExpDist() GRPC_OVERRIDE {}
-  double operator()(double uni) const GRPC_OVERRIDE {
+  double transform(double uni) const GRPC_OVERRIDE {
     // Note: Use 1.0-uni above to avoid NaN if uni is 0
     return lambda_recip_ * (-log(1.0 - uni));
   }
@@ -87,11 +87,11 @@ class ExpDist GRPC_FINAL : public RandomDist {
 // mean interarrival time is (lo+hi)/2. For more information,
 // see http://en.wikipedia.org/wiki/Uniform_distribution_%28continuous%29
 
-class UniformDist GRPC_FINAL : public RandomDist {
+class UniformDist GRPC_FINAL : public RandomDistInterface {
  public:
   UniformDist(double lo, double hi) : lo_(lo), range_(hi - lo) {}
   ~UniformDist() GRPC_OVERRIDE {}
-  double operator()(double uni) const GRPC_OVERRIDE {
+  double transform(double uni) const GRPC_OVERRIDE {
     return uni * range_ + lo_;
   }
 
@@ -106,11 +106,11 @@ class UniformDist GRPC_FINAL : public RandomDist {
 // clients) will not preserve any deterministic interarrival gap across
 // requests.
 
-class DetDist GRPC_FINAL : public RandomDist {
+class DetDist GRPC_FINAL : public RandomDistInterface {
  public:
   explicit DetDist(double val) : val_(val) {}
   ~DetDist() GRPC_OVERRIDE {}
-  double operator()(double uni) const GRPC_OVERRIDE { return val_; }
+  double transform(double uni) const GRPC_OVERRIDE { return val_; }
 
  private:
   double val_;
@@ -123,12 +123,12 @@ class DetDist GRPC_FINAL : public RandomDist {
 // good representation of the response times of data center jobs. See
 // http://en.wikipedia.org/wiki/Pareto_distribution
 
-class ParetoDist GRPC_FINAL : public RandomDist {
+class ParetoDist GRPC_FINAL : public RandomDistInterface {
  public:
   ParetoDist(double base, double alpha)
       : base_(base), alpha_recip_(1.0 / alpha) {}
   ~ParetoDist() GRPC_OVERRIDE {}
-  double operator()(double uni) const GRPC_OVERRIDE {
+  double transform(double uni) const GRPC_OVERRIDE {
     // Note: Use 1.0-uni above to avoid div by zero if uni is 0
     return base_ / pow(1.0 - uni, alpha_recip_);
   }
@@ -145,13 +145,14 @@ class ParetoDist GRPC_FINAL : public RandomDist {
 class InterarrivalTimer {
  public:
   InterarrivalTimer() {}
-  void init(const RandomDist& r, int threads, int entries = 1000000) {
+  void init(const RandomDistInterface& r, int threads, int entries = 1000000) {
     for (int i = 0; i < entries; i++) {
       // rand is the only choice that is portable across POSIX and Windows
       // and that supports new and old compilers
-      const double uniform_0_1 = rand() / RAND_MAX;
+      const double uniform_0_1 =
+          static_cast<double>(rand()) / static_cast<double>(RAND_MAX);
       random_table_.push_back(
-          std::chrono::nanoseconds(static_cast<int64_t>(1e9 * r(uniform_0_1))));
+          static_cast<int64_t>(1e9 * r.transform(uniform_0_1)));
     }
     // Now set up the thread positions
     for (int i = 0; i < threads; i++) {
@@ -160,7 +161,7 @@ class InterarrivalTimer {
   }
   virtual ~InterarrivalTimer(){};
 
-  std::chrono::nanoseconds operator()(int thread_num) {
+  int64_t next(int thread_num) {
     auto ret = *(thread_posns_[thread_num]++);
     if (thread_posns_[thread_num] == random_table_.end())
       thread_posns_[thread_num] = random_table_.begin();
@@ -168,7 +169,7 @@ class InterarrivalTimer {
   }
 
  private:
-  typedef std::vector<std::chrono::nanoseconds> time_table;
+  typedef std::vector<int64_t> time_table;
   std::vector<time_table::const_iterator> thread_posns_;
   time_table random_table_;
 };
diff --git a/test/cpp/qps/qps_interarrival_test.cc b/test/cpp/qps/qps_interarrival_test.cc
index ccda28f09a..77e81fb84b 100644
--- a/test/cpp/qps/qps_interarrival_test.cc
+++ b/test/cpp/qps/qps_interarrival_test.cc
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -39,17 +39,17 @@
 
 #include "test/cpp/qps/interarrival.h"
 
-using grpc::testing::RandomDist;
+using grpc::testing::RandomDistInterface;
 using grpc::testing::InterarrivalTimer;
 
-static void RunTest(RandomDist &&r, int threads, std::string title) {
+static void RunTest(RandomDistInterface &&r, int threads, std::string title) {
   InterarrivalTimer timer;
   timer.init(r, threads);
   gpr_histogram *h(gpr_histogram_create(0.01, 60e9));
 
   for (int i = 0; i < 10000000; i++) {
     for (int j = 0; j < threads; j++) {
-      gpr_histogram_add(h, timer(j).count());
+      gpr_histogram_add(h, timer.next(j));
     }
   }
 
@@ -70,7 +70,7 @@ using grpc::testing::ParetoDist;
 int main(int argc, char **argv) {
   RunTest(ExpDist(10.0), 5, std::string("Exponential(10)"));
   RunTest(DetDist(5.0), 5, std::string("Det(5)"));
-  RunTest(UniformDist(0.0, 10.0), 5, std::string("Uniform(1,10)"));
+  RunTest(UniformDist(0.0, 10.0), 5, std::string("Uniform(0,10)"));
   RunTest(ParetoDist(1.0, 1.0), 5, std::string("Pareto(1,1)"));
   return 0;
 }
diff --git a/test/cpp/qps/qps_openloop_test.cc b/test/cpp/qps/qps_openloop_test.cc
index fe5f685b6e..0ac41d9f96 100644
--- a/test/cpp/qps/qps_openloop_test.cc
+++ b/test/cpp/qps/qps_openloop_test.cc
@@ -53,7 +53,7 @@ static void RunQPS() {
   client_config.set_outstanding_rpcs_per_channel(1000);
   client_config.set_client_channels(8);
   client_config.set_async_client_threads(8);
-  client_config.set_rpc_type(UNARY);
+  client_config.set_rpc_type(STREAMING);
   client_config.mutable_load_params()->mutable_poisson()->set_offered_load(
       1000.0);
 
diff --git a/test/cpp/qps/qps_test.cc b/test/cpp/qps/qps_test.cc
index 15054db892..27aaf137f6 100644
--- a/test/cpp/qps/qps_test.cc
+++ b/test/cpp/qps/qps_test.cc
@@ -53,7 +53,7 @@ static void RunQPS() {
   client_config.set_outstanding_rpcs_per_channel(1000);
   client_config.set_client_channels(8);
   client_config.set_async_client_threads(8);
-  client_config.set_rpc_type(UNARY);
+  client_config.set_rpc_type(STREAMING);
   client_config.mutable_load_params()->mutable_closed_loop();
 
   ServerConfig server_config;
diff --git a/test/cpp/qps/server_async.cc b/test/cpp/qps/server_async.cc
index 1302d718f0..2024e0bfef 100644
--- a/test/cpp/qps/server_async.cc
+++ b/test/cpp/qps/server_async.cc
@@ -51,6 +51,7 @@
 #include <gtest/gtest.h>
 
 #include "src/proto/grpc/testing/services.grpc.pb.h"
+#include "test/core/util/test_config.h"
 #include "test/cpp/qps/server.h"
 
 namespace grpc {
@@ -129,7 +130,7 @@ class AsyncQpsServerTest : public Server {
     }
   }
   ~AsyncQpsServerTest() {
-    auto deadline = std::chrono::system_clock::now() + std::chrono::seconds(10);
+    auto deadline = GRPC_TIMEOUT_SECONDS_TO_DEADLINE(10);
     server_->Shutdown(deadline);
     for (auto ss = shutdown_state_.begin(); ss != shutdown_state_.end(); ++ss) {
       (*ss)->set_shutdown();
diff --git a/test/distrib/csharp/run_distrib_test.sh b/test/distrib/csharp/run_distrib_test.sh
index 8ddb4c4bff..1de62041b3 100755
--- a/test/distrib/csharp/run_distrib_test.sh
+++ b/test/distrib/csharp/run_distrib_test.sh
@@ -34,8 +34,9 @@ cd $(dirname $0)
 
 unzip -o "$EXTERNAL_GIT_ROOT/input_artifacts/csharp_nugets.zip" -d TestNugetFeed
 
-# TODO(jtattermusch): replace the version number
-./update_version.sh 0.13.0
+# Extract the version number from Grpc nuget package name.
+CSHARP_VERSION=$(ls TestNugetFeed | grep '^Grpc\.[0-9].*\.nupkg$' | sed s/^Grpc\.// | sed s/\.nupkg$//)
+./update_version.sh $CSHARP_VERSION
 
 nuget restore
 
diff --git a/test/distrib/node/run_distrib_test.sh b/test/distrib/node/run_distrib_test.sh
index ac9e7d7090..9b8f15771b 100755
--- a/test/distrib/node/run_distrib_test.sh
+++ b/test/distrib/node/run_distrib_test.sh
@@ -28,19 +28,19 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+NODE_VERSION=$1
+source ~/.nvm/nvm.sh
 set -ex
 
 cd $(dirname $0)
 
-NODE_VERSION="$1"
-
-# make sure nvm is available
-source ~/.nvm/nvm.sh || true
-
 nvm install $NODE_VERSION
 
 npm install -g node-static
 
+# Kill off existing static servers
+kill -9 $(ps aux | grep '[n]ode .*static' | awk '{print $2}') || true
+
 STATIC_SERVER=127.0.0.1
 STATIC_PORT=8080
 
diff --git a/test/distrib/python/distribtest.py b/test/distrib/python/distribtest.py
index 66c1f88796..dc20688140 100644
--- a/test/distrib/python/distribtest.py
+++ b/test/distrib/python/distribtest.py
@@ -1,4 +1,4 @@
-# Copyright 2015-2016, Google Inc.
+# Copyright 2016, Google Inc.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
diff --git a/test/distrib/python/run_distrib_test.sh b/test/distrib/python/run_distrib_test.sh
index 08856ad388..8fd7ffb54c 100755
--- a/test/distrib/python/run_distrib_test.sh
+++ b/test/distrib/python/run_distrib_test.sh
@@ -32,11 +32,11 @@ set -ex
 
 cd $(dirname $0)
 
-# TODO(jtattermusch): replace the version number
-SDIST_ARCHIVE="$EXTERNAL_GIT_ROOT/input_artifacts/grpcio-0.12.0b8.tar.gz"
+# Pick up the source dist archive whatever its version is
+SDIST_ARCHIVE=$EXTERNAL_GIT_ROOT/input_artifacts/grpcio-*.tar.gz
 BDIST_DIR="file://$EXTERNAL_GIT_ROOT/input_artifacts"
 
-if [ ! -f "${SDIST_ARCHIVE}" ]
+if [ ! -f ${SDIST_ARCHIVE} ]
 then
   echo "Archive ${SDIST_ARCHIVE} does not exist."
   exit 1
@@ -52,7 +52,7 @@ $PIP install --upgrade six
 
 GRPC_PYTHON_BINARIES_REPOSITORY="${BDIST_DIR}" \
     $PIP install \
-    "${SDIST_ARCHIVE}"
+    ${SDIST_ARCHIVE}
 
 $PYTHON distribtest.py
 
diff --git a/test/distrib/ruby/Gemfile b/test/distrib/ruby/Gemfile
new file mode 100644
index 0000000000..96e68e9c34
--- /dev/null
+++ b/test/distrib/ruby/Gemfile
@@ -0,0 +1,11 @@
+# -*- ruby -*-
+# encoding: utf-8
+
+source 'https://rubygems.org/'
+
+# TODO(jtattermusch): don't hardcode the absolute path the local gem source
+source "file:///var/local/git/grpc/gem_source" do
+  gem 'grpc'
+end
+
+gemspec
diff --git a/test/distrib/ruby/distribtest.gemspec b/test/distrib/ruby/distribtest.gemspec
new file mode 100644
index 0000000000..d72892f46c
--- /dev/null
+++ b/test/distrib/ruby/distribtest.gemspec
@@ -0,0 +1,19 @@
+# -*- ruby -*-
+# encoding: utf-8
+
+Gem::Specification.new do |s|
+  s.name          = 'distribtest'
+  s.version       = '0.0.1'
+  s.authors       = ['gRPC Authors']
+  s.email         = 'jtattermusch@google.com'
+  s.homepage      = 'https://github.com/grpc/grpc'
+  s.summary       = 'gRPC Distribution test'
+
+  s.files         = ['distribtest.rb']
+  s.executables   = ['distribtest.rb']
+  s.platform      = Gem::Platform::RUBY
+
+  s.add_dependency 'grpc', '>=0'
+
+  s.add_development_dependency 'bundler', '~> 1.7'
+end
diff --git a/test/distrib/ruby/distribtest.rb b/test/distrib/ruby/distribtest.rb
new file mode 100755
index 0000000000..3f656a89f3
--- /dev/null
+++ b/test/distrib/ruby/distribtest.rb
@@ -0,0 +1,39 @@
+#!/usr/bin/env ruby
+
+# Copyright 2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+require 'grpc'
+
+# This code doesn't do much but makes sure the native extension is loaded
+# which is what we are testing here.
+ch = GRPC::Core::Channel.new('localhost:1000', nil, :this_channel_is_insecure)
+ch.destroy
+
+puts "Success!"
diff --git a/test/distrib/ruby/run_distrib_test.sh b/test/distrib/ruby/run_distrib_test.sh
index ae409f8dc5..be60e44b63 100755
--- a/test/distrib/ruby/run_distrib_test.sh
+++ b/test/distrib/ruby/run_distrib_test.sh
@@ -32,5 +32,13 @@ set -ex
 
 cd $(dirname $0)
 
-# do something ruby-ish
+# Create an indexed local gem source with gRPC gems to test
+GEM_SOURCE=../../../gem_source
+mkdir -p ${GEM_SOURCE}/gems
+cp -r $EXTERNAL_GIT_ROOT/input_artifacts/*.gem ${GEM_SOURCE}/gems
+gem install builder
+gem generate_index --directory ${GEM_SOURCE}
 
+bundle install
+
+bundle exec ./distribtest.rb