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authorGravatar Abseil Team <absl-team@google.com>2018-12-20 12:29:59 -0800
committerGravatar Xiaoyi Zhang <zhangxy988@gmail.com>2018-12-21 14:43:20 -0500
commit968a34ffdaadd7db062a9621dfbdf8b2d16e05af (patch)
tree6db3f5237087d2c51b264ecb33cd57f1e17b69b9 /absl/container/internal/hashtablez_sampler_test.cc
parent3e2e9b5557e76d098de4b8a2a659125b98ca519b (diff)
Export of internal Abseil changes.
-- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
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diff --git a/absl/container/internal/hashtablez_sampler_test.cc b/absl/container/internal/hashtablez_sampler_test.cc
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+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/hashtablez_sampler.h"
+
+#include <atomic>
+#include <limits>
+#include <random>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/container/internal/have_sse.h"
+#include "absl/synchronization/blocking_counter.h"
+#include "absl/synchronization/internal/thread_pool.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/synchronization/notification.h"
+#include "absl/time/clock.h"
+#include "absl/time/time.h"
+
+#if SWISSTABLE_HAVE_SSE2
+constexpr int kProbeLength = 16;
+#else
+constexpr int kProbeLength = 8;
+#endif
+
+namespace absl {
+namespace container_internal {
+class HashtablezInfoHandlePeer {
+ public:
+ static bool IsSampled(const HashtablezInfoHandle& h) {
+ return h.info_ != nullptr;
+ }
+
+ static HashtablezInfo* GetInfo(HashtablezInfoHandle* h) { return h->info_; }
+};
+
+namespace {
+using ::absl::synchronization_internal::ThreadPool;
+using ::testing::IsEmpty;
+using ::testing::UnorderedElementsAre;
+
+std::vector<size_t> GetSizes(HashtablezSampler* s) {
+ std::vector<size_t> res;
+ s->Iterate([&](const HashtablezInfo& info) {
+ res.push_back(info.size.load(std::memory_order_acquire));
+ });
+ return res;
+}
+
+HashtablezInfo* Register(HashtablezSampler* s, size_t size) {
+ auto* info = s->Register();
+ assert(info != nullptr);
+ info->size.store(size);
+ return info;
+}
+
+TEST(HashtablezInfoTest, PrepareForSampling) {
+ absl::Time test_start = absl::Now();
+ HashtablezInfo info;
+ absl::MutexLock l(&info.init_mu);
+ info.PrepareForSampling();
+
+ EXPECT_EQ(info.capacity.load(), 0);
+ EXPECT_EQ(info.size.load(), 0);
+ EXPECT_EQ(info.num_erases.load(), 0);
+ EXPECT_EQ(info.max_probe_length.load(), 0);
+ EXPECT_EQ(info.total_probe_length.load(), 0);
+ EXPECT_EQ(info.hashes_bitwise_or.load(), 0);
+ EXPECT_EQ(info.hashes_bitwise_and.load(), ~size_t{});
+ EXPECT_GE(info.create_time, test_start);
+
+ info.capacity.store(1, std::memory_order_relaxed);
+ info.size.store(1, std::memory_order_relaxed);
+ info.num_erases.store(1, std::memory_order_relaxed);
+ info.max_probe_length.store(1, std::memory_order_relaxed);
+ info.total_probe_length.store(1, std::memory_order_relaxed);
+ info.hashes_bitwise_or.store(1, std::memory_order_relaxed);
+ info.hashes_bitwise_and.store(1, std::memory_order_relaxed);
+ info.create_time = test_start - absl::Hours(20);
+
+ info.PrepareForSampling();
+ EXPECT_EQ(info.capacity.load(), 0);
+ EXPECT_EQ(info.size.load(), 0);
+ EXPECT_EQ(info.num_erases.load(), 0);
+ EXPECT_EQ(info.max_probe_length.load(), 0);
+ EXPECT_EQ(info.total_probe_length.load(), 0);
+ EXPECT_EQ(info.hashes_bitwise_or.load(), 0);
+ EXPECT_EQ(info.hashes_bitwise_and.load(), ~size_t{});
+ EXPECT_GE(info.create_time, test_start);
+}
+
+TEST(HashtablezInfoTest, RecordStorageChanged) {
+ HashtablezInfo info;
+ absl::MutexLock l(&info.init_mu);
+ info.PrepareForSampling();
+ RecordStorageChangedSlow(&info, 17, 47);
+ EXPECT_EQ(info.size.load(), 17);
+ EXPECT_EQ(info.capacity.load(), 47);
+ RecordStorageChangedSlow(&info, 20, 20);
+ EXPECT_EQ(info.size.load(), 20);
+ EXPECT_EQ(info.capacity.load(), 20);
+}
+
+TEST(HashtablezInfoTest, RecordInsert) {
+ HashtablezInfo info;
+ absl::MutexLock l(&info.init_mu);
+ info.PrepareForSampling();
+ EXPECT_EQ(info.max_probe_length.load(), 0);
+ RecordInsertSlow(&info, 0x0000FF00, 6 * kProbeLength);
+ EXPECT_EQ(info.max_probe_length.load(), 6);
+ EXPECT_EQ(info.hashes_bitwise_and.load(), 0x0000FF00);
+ EXPECT_EQ(info.hashes_bitwise_or.load(), 0x0000FF00);
+ RecordInsertSlow(&info, 0x000FF000, 4 * kProbeLength);
+ EXPECT_EQ(info.max_probe_length.load(), 6);
+ EXPECT_EQ(info.hashes_bitwise_and.load(), 0x0000F000);
+ EXPECT_EQ(info.hashes_bitwise_or.load(), 0x000FFF00);
+ RecordInsertSlow(&info, 0x00FF0000, 12 * kProbeLength);
+ EXPECT_EQ(info.max_probe_length.load(), 12);
+ EXPECT_EQ(info.hashes_bitwise_and.load(), 0x00000000);
+ EXPECT_EQ(info.hashes_bitwise_or.load(), 0x00FFFF00);
+}
+
+TEST(HashtablezInfoTest, RecordErase) {
+ HashtablezInfo info;
+ absl::MutexLock l(&info.init_mu);
+ info.PrepareForSampling();
+ EXPECT_EQ(info.num_erases.load(), 0);
+ EXPECT_EQ(info.size.load(), 0);
+ RecordInsertSlow(&info, 0x0000FF00, 6 * kProbeLength);
+ EXPECT_EQ(info.size.load(), 1);
+ RecordEraseSlow(&info);
+ EXPECT_EQ(info.size.load(), 0);
+ EXPECT_EQ(info.num_erases.load(), 1);
+}
+
+TEST(HashtablezSamplerTest, SmallSampleParameter) {
+ SetHashtablezEnabled(true);
+ SetHashtablezSampleParameter(100);
+
+ for (int i = 0; i < 1000; ++i) {
+ int64_t next_sample = 0;
+ HashtablezInfo* sample = SampleSlow(&next_sample);
+ EXPECT_GT(next_sample, 0);
+ EXPECT_NE(sample, nullptr);
+ UnsampleSlow(sample);
+ }
+}
+
+TEST(HashtablezSamplerTest, LargeSampleParameter) {
+ SetHashtablezEnabled(true);
+ SetHashtablezSampleParameter(std::numeric_limits<int32_t>::max());
+
+ for (int i = 0; i < 1000; ++i) {
+ int64_t next_sample = 0;
+ HashtablezInfo* sample = SampleSlow(&next_sample);
+ EXPECT_GT(next_sample, 0);
+ EXPECT_NE(sample, nullptr);
+ UnsampleSlow(sample);
+ }
+}
+
+TEST(HashtablezSamplerTest, Sample) {
+ SetHashtablezEnabled(true);
+ SetHashtablezSampleParameter(100);
+ int64_t num_sampled = 0;
+ int64_t total = 0;
+ double sample_rate;
+ for (int i = 0; i < 1000000; ++i) {
+ HashtablezInfoHandle h = Sample();
+ ++total;
+ if (HashtablezInfoHandlePeer::IsSampled(h)) {
+ ++num_sampled;
+ }
+ sample_rate = static_cast<double>(num_sampled) / total;
+ if (0.005 < sample_rate && sample_rate < 0.015) break;
+ }
+ EXPECT_NEAR(sample_rate, 0.01, 0.005);
+}
+
+TEST(HashtablezSamplerTest, Handle) {
+ auto& sampler = HashtablezSampler::Global();
+ HashtablezInfoHandle h(sampler.Register());
+ auto* info = HashtablezInfoHandlePeer::GetInfo(&h);
+ info->hashes_bitwise_and.store(0x12345678, std::memory_order_relaxed);
+
+ bool found = false;
+ sampler.Iterate([&](const HashtablezInfo& h) {
+ if (&h == info) {
+ EXPECT_EQ(h.hashes_bitwise_and.load(), 0x12345678);
+ found = true;
+ }
+ });
+ EXPECT_TRUE(found);
+
+ h = HashtablezInfoHandle();
+ found = false;
+ sampler.Iterate([&](const HashtablezInfo& h) {
+ if (&h == info) {
+ // this will only happen if some other thread has resurrected the info
+ // the old handle was using.
+ if (h.hashes_bitwise_and.load() == 0x12345678) {
+ found = true;
+ }
+ }
+ });
+ EXPECT_FALSE(found);
+}
+
+TEST(HashtablezSamplerTest, Registration) {
+ HashtablezSampler sampler;
+ auto* info1 = Register(&sampler, 1);
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(1));
+
+ auto* info2 = Register(&sampler, 2);
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(1, 2));
+ info1->size.store(3);
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(3, 2));
+
+ sampler.Unregister(info1);
+ sampler.Unregister(info2);
+}
+
+TEST(HashtablezSamplerTest, Unregistration) {
+ HashtablezSampler sampler;
+ std::vector<HashtablezInfo*> infos;
+ for (size_t i = 0; i < 3; ++i) {
+ infos.push_back(Register(&sampler, i));
+ }
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 1, 2));
+
+ sampler.Unregister(infos[1]);
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 2));
+
+ infos.push_back(Register(&sampler, 3));
+ infos.push_back(Register(&sampler, 4));
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 2, 3, 4));
+ sampler.Unregister(infos[3]);
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 2, 4));
+
+ sampler.Unregister(infos[0]);
+ sampler.Unregister(infos[2]);
+ sampler.Unregister(infos[4]);
+ EXPECT_THAT(GetSizes(&sampler), IsEmpty());
+}
+
+TEST(HashtablezSamplerTest, MultiThreaded) {
+ HashtablezSampler sampler;
+ Notification stop;
+ ThreadPool pool(10);
+
+ for (int i = 0; i < 10; ++i) {
+ pool.Schedule([&sampler, &stop]() {
+ std::random_device rd;
+ std::mt19937 gen(rd());
+
+ std::vector<HashtablezInfo*> infoz;
+ while (!stop.HasBeenNotified()) {
+ if (infoz.empty()) {
+ infoz.push_back(sampler.Register());
+ }
+ switch (std::uniform_int_distribution<>(0, 2)(gen)) {
+ case 0: {
+ infoz.push_back(sampler.Register());
+ break;
+ }
+ case 1: {
+ size_t p =
+ std::uniform_int_distribution<>(0, infoz.size() - 1)(gen);
+ HashtablezInfo* info = infoz[p];
+ infoz[p] = infoz.back();
+ infoz.pop_back();
+ sampler.Unregister(info);
+ break;
+ }
+ case 2: {
+ absl::Duration oldest = absl::ZeroDuration();
+ sampler.Iterate([&](const HashtablezInfo& info) {
+ oldest = std::max(oldest, absl::Now() - info.create_time);
+ });
+ ASSERT_GE(oldest, absl::ZeroDuration());
+ break;
+ }
+ }
+ }
+ });
+ }
+ // The threads will hammer away. Give it a little bit of time for tsan to
+ // spot errors.
+ absl::SleepFor(absl::Seconds(3));
+ stop.Notify();
+}
+
+} // namespace
+} // namespace container_internal
+} // namespace absl