2 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
9 sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
11 from telemetry.core import browser_finder
12 from telemetry.core import browser_options
15 options = browser_options.BrowserFinderOptions()
16 parser = options.CreateParser('telemetry_perf_test.py')
17 options, args = parser.parse_args(args)
19 browser_to_create = browser_finder.FindBrowser(options)
20 assert browser_to_create
21 with browser_to_create.Create() as b:
24 # Measure round-trip-time for evaluate
28 tab.EvaluateJavaScript('%i * 2' % i)
29 times.append(time.time() - start)
31 avg = sum(times, 0.0) / N
32 squared_diffs = [(t - avg) * (t - avg) for t in times]
33 stdev = sum(squared_diffs, 0.0) / (N - 1)
35 percentile_75 = times[int(0.75 * N)]
37 print "%s: avg=%f; stdev=%f; min=%f; 75th percentile = %f" % (
38 "Round trip time (seconds)",
39 avg, stdev, min(times), percentile_75)
43 if __name__ == '__main__':
44 sys.exit(Main(sys.argv[1:]))