1 #!/usr/bin/env python 2 # Copyright 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 6 import os 7 import sys 8 import time 9 10 sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir)) 11 12 from telemetry.core import browser_finder 13 from telemetry.core import browser_options 14 15 16 def Main(args): 17 options = browser_options.BrowserFinderOptions() 18 parser = options.CreateParser('telemetry_perf_test.py') 19 options, args = parser.parse_args(args) 20 21 browser_to_create = browser_finder.FindBrowser(options) 22 assert browser_to_create 23 with browser_to_create.Create() as b: 24 tab = b.tabs[0] 25 26 # Measure round-trip-time for evaluate 27 times = [] 28 for i in range(1000): 29 start = time.time() 30 tab.EvaluateJavaScript('%i * 2' % i) 31 times.append(time.time() - start) 32 N = float(len(times)) 33 avg = sum(times, 0.0) / N 34 squared_diffs = [(t - avg) * (t - avg) for t in times] 35 stdev = sum(squared_diffs, 0.0) / (N - 1) 36 times.sort() 37 percentile_75 = times[int(0.75 * N)] 38 39 print "%s: avg=%f; stdev=%f; min=%f; 75th percentile = %f" % ( 40 "Round trip time (seconds)", 41 avg, stdev, min(times), percentile_75) 42 43 return 0 44 45 46 if __name__ == '__main__': 47 sys.exit(Main(sys.argv[1:])) 48
