1 files changed, 169 insertions, 0 deletions
diff --git a/tools/profiling/qps/qps_diff.py b/tools/profiling/qps/qps_diff.py
new file mode 100755
index 0000000000..0654f45666
--- /dev/null
+++ b/tools/profiling/qps/qps_diff.py
@@ -0,0 +1,169 @@
+#!/usr/bin/env python2.7
+#
+# Copyright 2017 gRPC 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.
+""" Computes the diff between two qps runs and outputs significant results """
+
+import argparse
+import json
+import multiprocessing
+import os
+import qps_scenarios
+import shutil
+import subprocess
+import sys
+import tabulate
+
+sys.path.append(
+  os.path.join(
+    os.path.dirname(sys.argv[0]), '..', 'microbenchmarks', 'bm_diff'))
+import bm_speedup
+
+sys.path.append(
+  os.path.join(
+    os.path.dirname(sys.argv[0]), '..', '..', 'run_tests', 'python_utils'))
+import comment_on_pr
+
+
+def _args():
+  argp = argparse.ArgumentParser(
+    description='Perform diff on QPS Driver')
+  argp.add_argument(
+    '-d',
+    '--diff_base',
+    type=str,
+    help='Commit or branch to compare the current one to')
+  argp.add_argument(
+    '-l',
+    '--loops',
+    type=int,
+    default=4,
+    help='Number of loops for each benchmark. More loops cuts down on noise'
+  )
+  argp.add_argument(
+    '-j',
+    '--jobs',
+    type=int,
+    default=multiprocessing.cpu_count(),
+    help='Number of CPUs to use')
+  args = argp.parse_args()
+  assert args.diff_base, "diff_base must be set"
+  return args
+
+
+def _make_cmd(jobs):
+  return ['make', '-j', '%d' % jobs, 'qps_json_driver', 'qps_worker']
+
+
+def build(name, jobs):
+  shutil.rmtree('qps_diff_%s' % name, ignore_errors=True)
+  subprocess.check_call(['git', 'submodule', 'update'])
+  try:
+    subprocess.check_call(_make_cmd(jobs))
+  except subprocess.CalledProcessError, e:
+    subprocess.check_call(['make', 'clean'])
+    subprocess.check_call(_make_cmd(jobs))
+  os.rename('bins', 'qps_diff_%s' % name)
+
+
+def _run_cmd(name, scenario, fname):
+  return ['qps_diff_%s/opt/qps_json_driver' % name, '--scenarios_json', scenario, '--json_file_out', fname]
+
+
+def run(name, scenarios, loops):
+  for sn in scenarios:
+    for i in range(0, loops):
+      fname = "%s.%s.%d.json" % (sn, name, i)
+      subprocess.check_call(_run_cmd(name, scenarios[sn], fname))
+
+
+def _load_qps(fname):
+  try:
+    with open(fname) as f:
+      return json.loads(f.read())['qps']
+  except IOError, e:
+    print("IOError occurred reading file: %s" % fname)
+    return None
+  except ValueError, e:
+    print("ValueError occurred reading file: %s" % fname)
+    return None
+
+
+def _median(ary):
+  assert (len(ary))
+  ary = sorted(ary)
+  n = len(ary)
+  if n % 2 == 0:
+    return (ary[(n - 1) / 2] + ary[(n - 1) / 2 + 1]) / 2.0
+  else:
+    return ary[n / 2]
+
+
+def diff(scenarios, loops, old, new):
+  old_data = {}
+  new_data = {}
+
+  # collect data
+  for sn in scenarios:
+    old_data[sn] = []
+    new_data[sn] = []
+    for i in range(loops):
+      old_data[sn].append(_load_qps("%s.%s.%d.json" % (sn, old, i)))
+      new_data[sn].append(_load_qps("%s.%s.%d.json" % (sn, new, i)))
+
+  # crunch data
+  headers = ['Benchmark', 'qps']
+  rows = []
+  for sn in scenarios:
+    mdn_diff = abs(_median(new_data[sn]) - _median(old_data[sn]))
+    print('%s: %s=%r %s=%r mdn_diff=%r' % (sn, new, new_data[sn], old, old_data[sn], mdn_diff))
+    s = bm_speedup.speedup(new_data[sn], old_data[sn], 10e-5)
+    if abs(s) > 3 and mdn_diff > 0.5:
+      rows.append([sn, '%+d%%' % s])
+
+  if rows:
+    return tabulate.tabulate(rows, headers=headers, floatfmt='+.2f')
+  else:
+    return None
+
+
+def main(args):
+  build('new', args.jobs)
+
+  if args.diff_base:
+    where_am_i = subprocess.check_output(
+      ['git', 'rev-parse', '--abbrev-ref', 'HEAD']).strip()
+    subprocess.check_call(['git', 'checkout', args.diff_base])
+    try:
+      build('old', args.jobs)
+    finally:
+      subprocess.check_call(['git', 'checkout', where_am_i])
+      subprocess.check_call(['git', 'submodule', 'update'])
+
+  run('new', qps_scenarios._SCENARIOS, args.loops)
+  run('old', qps_scenarios._SCENARIOS, args.loops)
+
+  diff_output = diff(qps_scenarios._SCENARIOS, args.loops, 'old', 'new')
+
+  if diff_output:
+    text = '[qps] Performance differences noted:\n%s' % diff_output
+  else:
+    text = '[qps] No significant performance differences'
+  print('%s' % text)
+  comment_on_pr.comment_on_pr('```\n%s\n```' % text)
+
+
+if __name__ == '__main__':
+  args = _args()
+  main(args)