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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 import telemetry | 11 from telemetry.core import browser_finder | 
|  | 12 from telemetry.core import browser_options | 
| 12 | 13 | 
| 13 def Main(args): | 14 def Main(args): | 
| 14   options = telemetry.BrowserOptions() | 15   options = browser_options.BrowserOptions() | 
| 15   parser = options.CreateParser('telemetry_perf_test.py') | 16   parser = options.CreateParser('telemetry_perf_test.py') | 
| 16   options, args = parser.parse_args(args) | 17   options, args = parser.parse_args(args) | 
| 17 | 18 | 
| 18   browser_to_create = telemetry.FindBrowser(options) | 19   browser_to_create = browser_finder.FindBrowser(options) | 
| 19   assert browser_to_create | 20   assert browser_to_create | 
| 20   with browser_to_create.Create() as b: | 21   with browser_to_create.Create() as b: | 
| 21     tab = b.tabs[0] | 22     tab = b.tabs[0] | 
| 22 | 23 | 
| 23     # Measure round-trip-time for evaluate | 24     # Measure round-trip-time for evaluate | 
| 24     times = [] | 25     times = [] | 
| 25     for i in range(1000): | 26     for i in range(1000): | 
| 26       start = time.time() | 27       start = time.time() | 
| 27       tab.EvaluateJavaScript('%i * 2' % i) | 28       tab.EvaluateJavaScript('%i * 2' % i) | 
| 28       times.append(time.time() - start) | 29       times.append(time.time() - start) | 
| 29     N = float(len(times)) | 30     N = float(len(times)) | 
| 30     avg = sum(times, 0.0) / N | 31     avg = sum(times, 0.0) / N | 
| 31     squared_diffs = [(t - avg) * (t - avg) for t in times] | 32     squared_diffs = [(t - avg) * (t - avg) for t in times] | 
| 32     stdev = sum(squared_diffs, 0.0) / (N - 1) | 33     stdev = sum(squared_diffs, 0.0) / (N - 1) | 
| 33     times.sort() | 34     times.sort() | 
| 34     percentile_75 = times[int(0.75 * N)] | 35     percentile_75 = times[int(0.75 * N)] | 
| 35 | 36 | 
| 36     print "%s: avg=%f; stdev=%f; min=%f; 75th percentile = %f" % ( | 37     print "%s: avg=%f; stdev=%f; min=%f; 75th percentile = %f" % ( | 
| 37       "Round trip time (seconds)", | 38       "Round trip time (seconds)", | 
| 38       avg, stdev, min(times), percentile_75) | 39       avg, stdev, min(times), percentile_75) | 
| 39 | 40 | 
| 40   return 0 | 41   return 0 | 
| 41 | 42 | 
| 42 if __name__ == '__main__': | 43 if __name__ == '__main__': | 
| 43   sys.exit(Main(sys.argv[1:])) | 44   sys.exit(Main(sys.argv[1:])) | 
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