| # Copyright (c) 2014 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 os, logging, shutil |
| from autotest_lib.client.bin import test, utils |
| |
| |
| class hardware_RamFio(test.test): |
| """ |
| Create ram disk and use FIO to test for ram throughput |
| """ |
| |
| version = 1 |
| |
| DEFAULT_SIZE = 1024 * 1024 * 1024 |
| |
| def run_once(self, size=DEFAULT_SIZE, requirements=None, dry_run=False): |
| """ |
| Call hardware_StorageFio to test on ram drive |
| |
| @param size: size to test in byte |
| 0 means all usable memory |
| @param requirements: requirement to pass to hardware_StorageFio |
| """ |
| # assume 20% overhead with ramfs |
| usable_mem = int(utils.usable_memtotal() * 1024 * 0.8) |
| |
| if size == 0: |
| size = usable_mem |
| elif usable_mem < size: |
| logging.info('Not enough memory. Want: %d, Usable: %d', |
| size, usable_mem) |
| size = usable_mem |
| |
| self.write_perf_keyval({'Size' : size}) |
| |
| if dry_run: |
| return |
| |
| utils.run('mkdir -p /tmp/ramdisk') |
| utils.run('mount -t ramfs ramfs /tmp/ramdisk') |
| |
| self.job.run_test('hardware_StorageFio', |
| dev='/tmp/ramdisk/test_file', |
| size=size, |
| requirements=requirements) |
| |
| utils.run('umount /tmp/ramdisk') |
| |
| dst = os.path.join(self.resultsdir, 'perf_measurements') |
| src = dst.replace('hardware_RamFio', 'hardware_StorageFio') |
| shutil.copyfile(src, dst) |
