1 #!/usr/bin/env python 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. 5 import os 6 import sys 7 import time 8 9 sys.path.append(os.path.join(os.path.dirname(__file__), '..')) 10 11 from telemetry.core import browser_finder 12 from telemetry.core import browser_options 13 14 def Main(args): 15 options = browser_options.BrowserFinderOptions() 16 parser = options.CreateParser('telemetry_perf_test.py') 17 options, args = parser.parse_args(args) 18 19 browser_to_create = browser_finder.FindBrowser(options) 20 assert browser_to_create 21 with browser_to_create.Create() as b: 22 tab = b.tabs[0] 23 24 # Measure round-trip-time for evaluate 25 times = [] 26 for i in range(1000): 27 start = time.time() 28 tab.EvaluateJavaScript('%i * 2' % i) 29 times.append(time.time() - start) 30 N = float(len(times)) 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) 34 times.sort() 35 percentile_75 = times[int(0.75 * N)] 36 37 print "%s: avg=%f; stdev=%f; min=%f; 75th percentile = %f" % ( 38 "Round trip time (seconds)", 39 avg, stdev, min(times), percentile_75) 40 41 return 0 42 43 if __name__ == '__main__': 44 sys.exit(Main(sys.argv[1:])) 45
