1 # Copyright 2013 The Chromium Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 """Multi tab memory test. 6 7 This test is a multi tab test, but we're interested in measurements for 8 the entire test rather than each single page. 9 """ 10 11 import logging 12 13 from metrics import histogram_util 14 from telemetry.page import page_measurement 15 16 17 class MemoryPressure(page_measurement.PageMeasurement): 18 def __init__(self, *args, **kwargs): 19 super(MemoryPressure, self).__init__(*args, **kwargs) 20 # _first_tab is used to access histograms 21 self._is_first_page = True 22 self._tab_count = 0 23 24 # Allow histogram collection 25 def CustomizeBrowserOptions(self, options): 26 histogram_util.CustomizeBrowserOptions(options) 27 28 # Open a new tab at each page 29 def TabForPage(self, page, browser): 30 return browser.tabs.New() 31 32 def GetTabsHistogramCounts(self, tab): 33 histogram_type = histogram_util.BROWSER_HISTOGRAM 34 discard_count = histogram_util.GetHistogramCount( 35 histogram_type, "Tabs.Discard.DiscardCount", tab) 36 kill_count = histogram_util.GetHistogramCount( 37 histogram_type, "Tabs.SadTab.KillCreated", tab) 38 return (discard_count, kill_count) 39 40 def MeasurePage(self, page, tab, results): 41 # After navigating to each page, check if it triggered tab discards or 42 # kills. 43 (discard_count, kill_count) = self.GetTabsHistogramCounts(tab) 44 45 # Sanity check for first page 46 if self._is_first_page: 47 self._is_first_page = False 48 assert discard_count == 0 and kill_count == 0 49 50 self._tab_count += 1 51 # End the test at the first kill or discard. 52 if kill_count > 0 or discard_count > 0: 53 logging.info("test ending at tab %d, discards = %d, kills = %d" % 54 (self._tab_count, discard_count, kill_count)) 55 self.RequestExit() 56
