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120 lines
4.1 KiB
Python
120 lines
4.1 KiB
Python
# 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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import re
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import android_commands
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import math
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# Valid values of result type.
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RESULT_TYPES = {'unimportant': 'RESULT ',
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'default': '*RESULT ',
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'informational': ''}
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def _EscapePerfResult(s):
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"""Escapes |s| for use in a perf result."""
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# Colons (:) and equal signs (=) are not allowed, and we chose an arbitrary
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# limit of 40 chars.
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return re.sub(':|=', '_', s[:40])
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def PrintPerfResult(measurement, trace, values, units, result_type='default',
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print_to_stdout=True):
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"""Prints numerical data to stdout in the format required by perf tests.
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The string args may be empty but they must not contain any colons (:) or
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equals signs (=).
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Args:
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measurement: A description of the quantity being measured, e.g. "vm_peak".
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trace: A description of the particular data point, e.g. "reference".
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values: A list of numeric measured values.
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units: A description of the units of measure, e.g. "bytes".
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result_type: A tri-state that accepts values of ['unimportant', 'default',
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'informational']. 'unimportant' prints RESULT, 'default' prints *RESULT
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and 'informational' prints nothing.
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print_to_stdout: If True, prints the output in stdout instead of returning
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the output to caller.
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Returns:
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String of the formated perf result.
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"""
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assert result_type in RESULT_TYPES, 'result type: %s is invalid' % result_type
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assert isinstance(values, list)
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assert len(values)
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assert '/' not in measurement
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avg = None
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sd = None
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if len(values) > 1:
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try:
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value = '[%s]' % ','.join([str(v) for v in values])
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avg = sum([float(v) for v in values]) / len(values)
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sqdiffs = [(float(v) - avg) ** 2 for v in values]
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variance = sum(sqdiffs) / (len(values) - 1)
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sd = math.sqrt(variance)
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except ValueError:
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value = ", ".join(values)
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else:
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value = values[0]
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trace_name = _EscapePerfResult(trace)
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output = '%s%s: %s%s%s %s' % (
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RESULT_TYPES[result_type],
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_EscapePerfResult(measurement),
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trace_name,
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# Do not show equal sign if the trace is empty. Usually it happens when
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# measurement is enough clear to describe the result.
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'= ' if trace_name else '',
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value,
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units)
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if avg:
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output += '\nAvg %s: %f%s' % (measurement, avg, units)
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if sd:
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output += '\nSd %s: %f%s' % (measurement, sd, units)
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if print_to_stdout:
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print output
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return output
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class PerfTestSetup(object):
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"""Provides methods for setting up a device for perf testing."""
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_DROP_CACHES = '/proc/sys/vm/drop_caches'
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_SCALING_GOVERNOR = '/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor'
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def __init__(self, adb):
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self._adb = adb
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num_cpus = self._adb.GetFileContents('/sys/devices/system/cpu/online',
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log_result=False)
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assert num_cpus, 'Unable to find /sys/devices/system/cpu/online'
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self._num_cpus = int(num_cpus[0].split('-')[-1])
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self._original_scaling_governor = None
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def DropRamCaches(self):
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"""Drops the filesystem ram caches for performance testing."""
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if not self._adb.IsRootEnabled():
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self._adb.EnableAdbRoot()
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self._adb.RunShellCommand('sync')
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self._adb.RunShellCommand('echo 3 > ' + PerfTestSetup._DROP_CACHES)
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def SetUp(self):
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"""Sets up performance tests."""
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if not self._original_scaling_governor:
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self._original_scaling_governor = self._adb.GetFileContents(
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PerfTestSetup._SCALING_GOVERNOR % 0,
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log_result=False)[0]
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self._SetScalingGovernorInternal('performance')
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self.DropRamCaches()
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def TearDown(self):
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"""Tears down performance tests."""
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if self._original_scaling_governor:
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self._SetScalingGovernorInternal(self._original_scaling_governor)
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self._original_scaling_governor = None
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def _SetScalingGovernorInternal(self, value):
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for cpu in range(self._num_cpus):
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self._adb.RunShellCommand(
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('echo %s > ' + PerfTestSetup._SCALING_GOVERNOR) % (value, cpu))
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