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#!/usr/bin/env python3
#
# Benchmark preallocate filter
#
# Copyright (c) 2020 Virtuozzo International GmbH.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import sys
import os
import subprocess
import re
import json
import simplebench
from results_to_text import results_to_text
def qemu_img_bench(args):
p = subprocess.run(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
universal_newlines=True)
if p.returncode == 0:
try:
m = re.search(r'Run completed in (\d+.\d+) seconds.', p.stdout)
return {'seconds': float(m.group(1))}
except Exception:
return {'error': f'failed to parse qemu-img output: {p.stdout}'}
else:
return {'error': f'qemu-img failed: {p.returncode}: {p.stdout}'}
def bench_func(env, case):
fname = f"{case['dir']}/prealloc-test.qcow2"
try:
os.remove(fname)
except OSError:
pass
subprocess.run([env['qemu-img-binary'], 'create', '-f', 'qcow2', fname,
'16G'], stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL, check=True)
args = [env['qemu-img-binary'], 'bench', '-c', str(case['count']),
'-d', '64', '-s', case['block-size'], '-t', 'none', '-n', '-w']
if env['prealloc']:
args += ['--image-opts',
'driver=qcow2,file.driver=preallocate,file.file.driver=file,'
f'file.file.filename={fname}']
else:
args += ['-f', 'qcow2', fname]
return qemu_img_bench(args)
def auto_count_bench_func(env, case):
case['count'] = 100
while True:
res = bench_func(env, case)
if 'error' in res:
return res
if res['seconds'] >= 1:
break
case['count'] *= 10
if res['seconds'] < 5:
case['count'] = round(case['count'] * 5 / res['seconds'])
res = bench_func(env, case)
if 'error' in res:
return res
res['iops'] = case['count'] / res['seconds']
return res
if __name__ == '__main__':
if len(sys.argv) < 2:
print(f'USAGE: {sys.argv[0]} <qemu-img binary> '
'DISK_NAME:DIR_PATH ...')
exit(1)
qemu_img = sys.argv[1]
envs = [
{
'id': 'no-prealloc',
'qemu-img-binary': qemu_img,
'prealloc': False
},
{
'id': 'prealloc',
'qemu-img-binary': qemu_img,
'prealloc': True
}
]
aligned_cases = []
unaligned_cases = []
for disk in sys.argv[2:]:
name, path = disk.split(':')
aligned_cases.append({
'id': f'{name}, aligned sequential 16k',
'block-size': '16k',
'dir': path
})
unaligned_cases.append({
'id': f'{name}, unaligned sequential 64k',
'block-size': '16k',
'dir': path
})
result = simplebench.bench(auto_count_bench_func, envs,
aligned_cases + unaligned_cases, count=5)
print(results_to_text(result))
with open('results.json', 'w') as f:
json.dump(result, f, indent=4)
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