client/site_tests/kernel_HdParm/kernel_HdParm.py

#!/usr/bin/python
#
# Copyright (c) 2011-2012 The Chromium 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 logging, re

from autotest_lib.client.bin import test, utils
from autotest_lib.client.common_lib import error


class kernel_HdParm(test.test):
    """
    Measure disk performance: both disk (-t) and cache (-T).
    """
    version = 1

    def run_once(self):
        if (utils.get_cpu_arch() == "arm"):
            disk = '/dev/mmcblk0'
        else:
            disk = '/dev/sda'

        logging.debug("Using device %s", disk)

        result = utils.system_output('hdparm -T %s' % disk)
        match = re.search('(\d+\.\d+) MB\/sec', result)
        self.write_perf_keyval({'cache_throughput': match.groups()[0]})
        result = utils.system_output('hdparm -t %s' % disk)
        match = re.search('(\d+\.\d+) MB\/sec', result)
        self.write_perf_keyval({'disk_throughput': match.groups()[0]})