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1 #!/usr/bin/env python | 1 #!/usr/bin/env python |
2 # Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 3 # Use of this source code is governed by a BSD-style license that can be |
4 # found in the LICENSE file. | 4 # found in the LICENSE file. |
5 import os | 5 import os |
6 import sys | 6 import sys |
7 import time | 7 import time |
8 | 8 |
9 sys.path.append(os.path.join(os.path.dirname(__file__), '..')) | 9 sys.path.append(os.path.join(os.path.dirname(__file__), '..')) |
10 | 10 |
11 from telemetry.core import browser_finder | 11 import telemetry |
12 from telemetry.core import browser_options | |
13 | 12 |
14 def Main(args): | 13 def Main(args): |
15 options = browser_options.BrowserOptions() | 14 options = telemetry.BrowserOptions() |
16 parser = options.CreateParser('telemetry_perf_test.py') | 15 parser = options.CreateParser('telemetry_perf_test.py') |
17 options, args = parser.parse_args(args) | 16 options, args = parser.parse_args(args) |
18 | 17 |
19 browser_to_create = browser_finder.FindBrowser(options) | 18 browser_to_create = telemetry.FindBrowser(options) |
20 assert browser_to_create | 19 assert browser_to_create |
21 with browser_to_create.Create() as b: | 20 with browser_to_create.Create() as b: |
22 tab = b.tabs[0] | 21 tab = b.tabs[0] |
23 | 22 |
24 # Measure round-trip-time for evaluate | 23 # Measure round-trip-time for evaluate |
25 times = [] | 24 times = [] |
26 for i in range(1000): | 25 for i in range(1000): |
27 start = time.time() | 26 start = time.time() |
28 tab.EvaluateJavaScript('%i * 2' % i) | 27 tab.EvaluateJavaScript('%i * 2' % i) |
29 times.append(time.time() - start) | 28 times.append(time.time() - start) |
30 N = float(len(times)) | 29 N = float(len(times)) |
31 avg = sum(times, 0.0) / N | 30 avg = sum(times, 0.0) / N |
32 squared_diffs = [(t - avg) * (t - avg) for t in times] | 31 squared_diffs = [(t - avg) * (t - avg) for t in times] |
33 stdev = sum(squared_diffs, 0.0) / (N - 1) | 32 stdev = sum(squared_diffs, 0.0) / (N - 1) |
34 times.sort() | 33 times.sort() |
35 percentile_75 = times[int(0.75 * N)] | 34 percentile_75 = times[int(0.75 * N)] |
36 | 35 |
37 print "%s: avg=%f; stdev=%f; min=%f; 75th percentile = %f" % ( | 36 print "%s: avg=%f; stdev=%f; min=%f; 75th percentile = %f" % ( |
38 "Round trip time (seconds)", | 37 "Round trip time (seconds)", |
39 avg, stdev, min(times), percentile_75) | 38 avg, stdev, min(times), percentile_75) |
40 | 39 |
41 return 0 | 40 return 0 |
42 | 41 |
43 if __name__ == '__main__': | 42 if __name__ == '__main__': |
44 sys.exit(Main(sys.argv[1:])) | 43 sys.exit(Main(sys.argv[1:])) |
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