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#!/usr/bin/env python3
#
# Benchmark block jobs
#
# Copyright (c) 2019 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 socket
import json
sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
from qemu.machine import QEMUMachine
from qemu.qmp import ConnectError
def bench_block_job(cmd, cmd_args, qemu_args):
"""Benchmark block-job
cmd -- qmp command to run block-job (like blockdev-backup)
cmd_args -- dict of qmp command arguments
qemu_args -- list of Qemu command line arguments, including path to Qemu
binary
Returns {'seconds': int} on success and {'error': str} on failure, dict may
contain additional 'vm-log' field. Return value is compatible with
simplebench lib.
"""
vm = QEMUMachine(qemu_args[0], args=qemu_args[1:])
try:
vm.launch()
except OSError as e:
return {'error': 'popen failed: ' + str(e)}
except (ConnectError, socket.timeout):
return {'error': 'qemu failed: ' + str(vm.get_log())}
try:
res = vm.qmp(cmd, **cmd_args)
if res != {'return': {}}:
vm.shutdown()
return {'error': '"{}" command failed: {}'.format(cmd, str(res))}
e = vm.event_wait('JOB_STATUS_CHANGE')
assert e['data']['status'] == 'created'
start_ms = e['timestamp']['seconds'] * 1000000 + \
e['timestamp']['microseconds']
e = vm.events_wait((('BLOCK_JOB_READY', None),
('BLOCK_JOB_COMPLETED', None),
('BLOCK_JOB_FAILED', None)), timeout=True)
if e['event'] not in ('BLOCK_JOB_READY', 'BLOCK_JOB_COMPLETED'):
vm.shutdown()
return {'error': 'block-job failed: ' + str(e),
'vm-log': vm.get_log()}
if 'error' in e['data']:
vm.shutdown()
return {'error': 'block-job failed: ' + e['data']['error'],
'vm-log': vm.get_log()}
end_ms = e['timestamp']['seconds'] * 1000000 + \
e['timestamp']['microseconds']
finally:
vm.shutdown()
return {'seconds': (end_ms - start_ms) / 1000000.0}
def get_image_size(path):
out = subprocess.run(['qemu-img', 'info', '--out=json', path],
stdout=subprocess.PIPE, check=True).stdout
return json.loads(out)['virtual-size']
def get_blockdev_size(obj):
img = obj['filename'] if 'filename' in obj else obj['file']['filename']
return get_image_size(img)
# Bench backup or mirror
def bench_block_copy(qemu_binary, cmd, cmd_options, source, target):
"""Helper to run bench_block_job() for mirror or backup"""
assert cmd in ('blockdev-backup', 'blockdev-mirror')
if target['driver'] == 'qcow2':
try:
os.remove(target['file']['filename'])
except OSError:
pass
subprocess.run(['qemu-img', 'create', '-f', 'qcow2',
target['file']['filename'],
str(get_blockdev_size(source))],
stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL, check=True)
source['node-name'] = 'source'
target['node-name'] = 'target'
cmd_options['job-id'] = 'job0'
cmd_options['device'] = 'source'
cmd_options['target'] = 'target'
cmd_options['sync'] = 'full'
return bench_block_job(cmd, cmd_options,
[qemu_binary,
'-blockdev', json.dumps(source),
'-blockdev', json.dumps(target)])
def drv_file(filename, o_direct=True):
node = {'driver': 'file', 'filename': filename}
if o_direct:
node['cache'] = {'direct': True}
node['aio'] = 'native'
return node
def drv_nbd(host, port):
return {'driver': 'nbd',
'server': {'type': 'inet', 'host': host, 'port': port}}
def drv_qcow2(file):
return {'driver': 'qcow2', 'file': file}
if __name__ == '__main__':
import sys
if len(sys.argv) < 4:
print('USAGE: {} <qmp block-job command name> '
'<json string of arguments for the command> '
'<qemu binary path and arguments>'.format(sys.argv[0]))
exit(1)
res = bench_block_job(sys.argv[1], json.loads(sys.argv[2]), sys.argv[3:])
if 'seconds' in res:
print('{:.2f}'.format(res['seconds']))
else:
print(res)
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