117 lines
4.2 KiB
Python
117 lines
4.2 KiB
Python
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# Copyright (c) 2012 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Utilities for iotop/top style profiling for android."""
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import collections
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import json
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import os
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import subprocess
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import sys
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import urllib
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import constants
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import io_stats_parser
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class DeviceStatsMonitor(object):
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"""Class for collecting device stats such as IO/CPU usage.
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Args:
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adb: Instance of AndroidComannds.
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hz: Frequency at which to sample device stats.
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"""
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DEVICE_PATH = constants.TEST_EXECUTABLE_DIR + '/device_stats_monitor'
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PROFILE_PATH = (constants.DEVICE_PERF_OUTPUT_DIR +
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'/device_stats_monitor.profile')
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RESULT_VIEWER_PATH = os.path.abspath(os.path.join(
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os.path.dirname(os.path.realpath(__file__)), 'device_stats_monitor.html'))
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def __init__(self, adb, hz, build_type):
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self._adb = adb
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host_path = os.path.abspath(os.path.join(
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constants.DIR_SOURCE_ROOT, 'out', build_type, 'device_stats_monitor'))
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self._adb.PushIfNeeded(host_path, DeviceStatsMonitor.DEVICE_PATH)
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self._hz = hz
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def Start(self):
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"""Starts device stats monitor on the device."""
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self._adb.SetProtectedFileContents(DeviceStatsMonitor.PROFILE_PATH, '')
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self._process = subprocess.Popen(
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['adb', 'shell', '%s --hz=%d %s' % (
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DeviceStatsMonitor.DEVICE_PATH, self._hz,
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DeviceStatsMonitor.PROFILE_PATH)])
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def StopAndCollect(self, output_path):
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"""Stops monitoring and saves results.
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Args:
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output_path: Path to save results.
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Returns:
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String of URL to load results in browser.
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"""
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assert self._process
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self._adb.KillAll(DeviceStatsMonitor.DEVICE_PATH)
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self._process.wait()
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profile = self._adb.GetFileContents(DeviceStatsMonitor.PROFILE_PATH)
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results = collections.defaultdict(list)
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last_io_stats = None
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last_cpu_stats = None
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for line in profile:
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if ' mmcblk0 ' in line:
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stats = io_stats_parser.ParseIoStatsLine(line)
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if last_io_stats:
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results['sectors_read'].append(stats.num_sectors_read -
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last_io_stats.num_sectors_read)
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results['sectors_written'].append(stats.num_sectors_written -
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last_io_stats.num_sectors_written)
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last_io_stats = stats
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elif line.startswith('cpu '):
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stats = self._ParseCpuStatsLine(line)
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if last_cpu_stats:
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results['user'].append(stats.user - last_cpu_stats.user)
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results['nice'].append(stats.nice - last_cpu_stats.nice)
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results['system'].append(stats.system - last_cpu_stats.system)
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results['idle'].append(stats.idle - last_cpu_stats.idle)
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results['iowait'].append(stats.iowait - last_cpu_stats.iowait)
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results['irq'].append(stats.irq - last_cpu_stats.irq)
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results['softirq'].append(stats.softirq- last_cpu_stats.softirq)
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last_cpu_stats = stats
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units = {
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'sectors_read': 'sectors',
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'sectors_written': 'sectors',
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'user': 'jiffies',
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'nice': 'jiffies',
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'system': 'jiffies',
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'idle': 'jiffies',
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'iowait': 'jiffies',
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'irq': 'jiffies',
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'softirq': 'jiffies',
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}
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with open(output_path, 'w') as f:
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f.write('display(%d, %s, %s);' % (self._hz, json.dumps(results), units))
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return 'file://%s?results=file://%s' % (
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DeviceStatsMonitor.RESULT_VIEWER_PATH, urllib.quote(output_path))
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@staticmethod
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def _ParseCpuStatsLine(line):
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"""Parses a line of cpu stats into a CpuStats named tuple."""
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# Field definitions: http://www.linuxhowtos.org/System/procstat.htm
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cpu_stats = collections.namedtuple('CpuStats',
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['device',
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'user',
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'nice',
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'system',
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'idle',
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'iowait',
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'irq',
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'softirq',
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])
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fields = line.split()
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return cpu_stats._make([fields[0]] + [int(f) for f in fields[1:8]])
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