1 # Copyright 2015 The Chromium OS 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 import logging 6 import os 7 import re 8 9 import common 10 from autotest_lib.client.common_lib import error 11 from autotest_lib.server import test 12 13 14 _DEFAULT_BLOCK_SIZE = 4096 15 _DEFAULT_NUM_BLOCKS = 20000 16 _DEFAULT_MIN_SPEED = 30 * 1024 * 1024 17 18 19 class brillo_StorageWriteSpeedTest(test.test): 20 """Verify that writing to a Brillo device data storage is fast enough.""" 21 version = 1 22 23 def run_once(self, host=None, block_size=_DEFAULT_BLOCK_SIZE, 24 num_blocks=_DEFAULT_NUM_BLOCKS, min_speed=_DEFAULT_MIN_SPEED): 25 """Runs the test. 26 27 @param host: A host object representing the DUT. 28 @param block_size: The size of blocks to write in bytes. 29 @param num_blocks: The number of blocks to write. 30 @param min_speed: Minimum required write speed in bytes/sec. 31 32 @raise TestError: Something went wrong while trying to execute the test. 33 @raise TestFail: The test failed. 34 """ 35 try: 36 tmp_file = os.path.join(host.get_tmp_dir(), 'testfile') 37 result = host.run_output( 38 'dd if=/dev/zero of=%s bs=%s count=%s 2>&1' % 39 (tmp_file, block_size, num_blocks)) 40 actual_speed = None 41 for line in result.splitlines(): 42 match = re.match('.*\(([0-9]+) bytes/sec\)$', line) 43 if match: 44 actual_speed = int(match.group(1)) 45 break 46 if actual_speed is None: 47 raise error.TestError('Error finding storage write speed') 48 logging.info('Actual write speed is %d bytes/sec', actual_speed) 49 if actual_speed < int(min_speed): 50 logging.error('Write speed (%s bytes/sec) is lower than ' 51 'required (%s bytes/sec)', 52 actual_speed, min_speed) 53 raise error.TestFail( 54 'Storage write speed is lower than required') 55 except error.GenericHostRunError: 56 raise error.TestFail('Error writing to device data partition') 57
