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# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import cStringIO, collections, dbus, gzip, logging, subprocess
from autotest_lib.client.bin import test
from autotest_lib.client.common_lib import error
class platform_DebugDaemonGetPerfData(test.test):
"""
This autotest tests the collection of perf data. It calls perf indirectly
through debugd -> quipper -> perf.
The perf data is collected both when the system is idle and when there is a
process running in the background.
The perf data is collected over various durations.
"""
version = 1
# A list of durations over which to gather perf data using quipper (given in
# seconds), plus the number of times to run perf with each duration.
# e.g. the entry "1: 50" means to run perf for 1 second 50 times.
_profile_duration_and_repetitions = [
(1, 3),
(5, 1)
]
# Commands to repeatedly run in the background when collecting perf data.
_system_load_commands = {
'idle' : 'sleep 1',
'busy' : 'ls',
}
_dbus_debugd_object = '/org/chromium/debugd'
_dbus_debugd_name = 'org.chromium.debugd'
# For storing the size of returned results.
SizeInfo = collections.namedtuple('SizeInfo', ['size', 'size_zipped'])
def gzip_string(self, string):
"""
Gzip a string.
@param string: The input string to be gzipped.
Returns:
The gzipped string.
"""
string_file = cStringIO.StringIO()
gzip_file = gzip.GzipFile(fileobj=string_file, mode='wb')
gzip_file.write(string)
gzip_file.close()
return string_file.getvalue()
def validate_get_perf_method(self, duration, num_reps, load_type):
"""
Validate a debugd method that returns perf data.
@param duration: The duration to use for perf data collection.
@param num_reps: Number of times to run.
@param load_type: A label to use for storing into perf keyvals.
"""
# Dictionary for storing results returned from debugd.
# Key: Name of data type (string)
# Value: Sizes of results in bytes (list of SizeInfos)
stored_results = collections.defaultdict(list)
for _ in range(num_reps):
perf_command = ['perf', 'record', '-a', '-e', 'cycles',
'-c', '1000003']
status, perf_data, perf_stat = self.dbus_iface.GetPerfOutput(
duration, perf_command, signature="uas")
if status != 0:
raise error.TestFail('GetPerfOutput() returned status %d',
status)
if len(perf_data) == 0 and len(perf_stat) == 0:
raise error.TestFail('GetPerfOutput() returned no data')
if len(perf_data) > 0 and len(perf_stat) > 0:
raise error.TestFail('GetPerfOutput() returned both '
'perf_data and perf_stat')
result_type = None
if perf_data:
result = perf_data
result_type = "perf_data"
else: # if perf_stat
result = perf_stat
result_type = "perf_stat"
logging.info('GetPerfOutput() for %s seconds returned %d '
'bytes of type %s',
duration, len(result), result_type)
if len(result) < 10:
raise error.TestFail('Perf output too small')
# Convert |result| from an array of dbus.Bytes to a string.
result = ''.join(chr(b) for b in result)
# If there was an error in collecting a profile with quipper, debugd
# will output an error message. Make sure to check for this message.
# It is found in PerfTool::GetPerfDataHelper() in
# debugd/src/perf_tool.cc.
if result.startswith('<process exited with status: '):
raise error.TestFail('Quipper failed: %s' % result)
stored_results[result_type].append(
self.SizeInfo(len(result), len(self.gzip_string(result))))
for result_type, sizes in stored_results.iteritems():
key = 'mean_%s_size_%s_%d' % (result_type, load_type, duration)
total_size = sum(entry.size for entry in sizes)
total_size_zipped = sum(entry.size_zipped for entry in sizes)
keyvals = {}
keyvals[key] = total_size / len(sizes)
keyvals[key + '_zipped'] = total_size_zipped / len(sizes)
self.write_perf_keyval(keyvals)
def run_once(self, *args, **kwargs):
"""
Primary autotest function.
"""
bus = dbus.SystemBus()
proxy = bus.get_object(
self._dbus_debugd_name, self._dbus_debugd_object, introspect=False)
self.dbus_iface = dbus.Interface(proxy,
dbus_interface=self._dbus_debugd_name)
# Open /dev/null to redirect unnecessary output.
devnull = open('/dev/null', 'w')
load_items = self._system_load_commands.iteritems()
for load_type, load_command in load_items:
# Repeatedly run the comand for the current load.
cmd = 'while true; do %s; done' % load_command
process = subprocess.Popen(cmd, stdout=devnull, shell=True)
for duration, num_reps in self._profile_duration_and_repetitions:
# Collect perf data from debugd.
self.validate_get_perf_method(duration, num_reps, load_type)
# Terminate the process and actually wait for it to terminate.
process.terminate()
while process.poll() == None:
pass
devnull.close()
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