diff --git a/test/cpp/qps/qps_diff.py b/test/cpp/qps/qps_diff.py
new file mode 100755
index 0000000000000000000000000000000000000000..9db5f73194237fbd60040f237e65b92037d1938e
--- /dev/null
+++ b/test/cpp/qps/qps_diff.py
@@ -0,0 +1,164 @@
+#!/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 shutil
+import subprocess
+import os
+import multiprocessing
+import json
+import sys
+import tabulate
+import argparse
+
+sys.path.append(
+ os.path.join(
+ os.path.dirname(sys.argv[0]), '..', '..', '..', 'tools', 'profiling', 'microbenchmarks', 'bm_diff'))
+import bm_speedup
+
+sys.path.append(
+ os.path.join(
+ os.path.dirname(sys.argv[0]), '..', '..', '..', 'tools', 'run_tests', 'python_utils'))
+import comment_on_pr
+
+_SCENARIOS = {
+ 'large-message-throughput': '{"scenarios":[{"name":"large-message-throughput", "spawn_local_worker_count": -2, "warmup_seconds": 30, "benchmark_seconds": 270, "num_servers": 1, "server_config": {"async_server_threads": 1, "security_params": null, "server_type": "ASYNC_SERVER"}, "num_clients": 1, "client_config": {"client_type": "ASYNC_CLIENT", "security_params": null, "payload_config": {"simple_params": {"resp_size": 1048576, "req_size": 1048576}}, "client_channels": 1, "async_client_threads": 1, "outstanding_rpcs_per_channel": 1, "rpc_type": "UNARY", "load_params": {"closed_loop": {}}, "histogram_params": {"max_possible": 60000000000.0, "resolution": 0.01}}}]}',
+ 'multi-channel-64-KiB': '{"scenarios":[{"name":"multi-channel-64-KiB", "spawn_local_worker_count": -3, "warmup_seconds": 30, "benchmark_seconds": 270, "num_servers": 1, "server_config": {"async_server_threads": 31, "security_params": null, "server_type": "ASYNC_SERVER"}, "num_clients": 2, "client_config": {"client_type": "ASYNC_CLIENT", "security_params": null, "payload_config": {"simple_params": {"resp_size": 65536, "req_size": 65536}}, "client_channels": 32, "async_client_threads": 31, "outstanding_rpcs_per_channel": 100, "rpc_type": "UNARY", "load_params": {"closed_loop": {}}, "histogram_params": {"max_possible": 60000000000.0, "resolution": 0.01}}}]}'
+}
+
+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=6,
+ help='Number of times to loops the benchmarks. 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(0, 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])
+ 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', _SCENARIOS, args.loops)
+ run('old', _SCENARIOS, args.loops)
+
+ diff = diff(_SCENARIOS, args.loops, 'old', 'new')
+
+ if diff:
+ text = '[qps] Performance differences noted:\n%s' % diff
+ 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);