From patchwork Sun Jul 12 17:49:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Shinkevich X-Patchwork-Id: 1327582 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=virtuozzo.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4B4Z7s4ymMz9sQt for ; Mon, 13 Jul 2020 03:50:49 +1000 (AEST) Received: from localhost ([::1]:47178 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jug7j-00040K-CF for incoming@patchwork.ozlabs.org; Sun, 12 Jul 2020 13:50:47 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54436) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jug6Q-00039c-VY; Sun, 12 Jul 2020 13:49:26 -0400 Received: from relay.sw.ru ([185.231.240.75]:60379 helo=relay3.sw.ru) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jug6N-0001lA-9E; Sun, 12 Jul 2020 13:49:26 -0400 Received: from [172.16.25.136] (helo=localhost.sw.ru) by relay3.sw.ru with esmtp (Exim 4.93) (envelope-from ) id 1jug6B-0005LT-Ho; Sun, 12 Jul 2020 20:49:11 +0300 From: Andrey Shinkevich To: qemu-block@nongnu.org Subject: [PATCH v4 1/3] scripts/simplebench: compare write request performance Date: Sun, 12 Jul 2020 20:49:16 +0300 Message-Id: <1594576158-75884-2-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1594576158-75884-1-git-send-email-andrey.shinkevich@virtuozzo.com> References: <1594576158-75884-1-git-send-email-andrey.shinkevich@virtuozzo.com> Received-SPF: pass client-ip=185.231.240.75; envelope-from=andrey.shinkevich@virtuozzo.com; helo=relay3.sw.ru X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/12 13:17:17 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, vsementsov@virtuozzo.com, qemu-devel@nongnu.org, mreitz@redhat.com, andrey.shinkevich@virtuozzo.com, den@openvz.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The script 'bench_write_req.py' allows comparing performances of write request for two qemu-img binary files. An example with (qemu-img binary 1) and without (qemu-img binary 2) the applied patch "qcow2: skip writing zero buffers to empty COW areas" (git commit ID: c8bb23cbdbe32f5) has the following results: SSD: ----------------- ------------------- ------------------- 0.34 +- 0.01 10.57 +- 0.96 0.33 +- 0.01 9.15 +- 0.85 0.33 +- 0.00 8.72 +- 0.05 7.43 +- 1.19 14.35 +- 1.00 ----------------- ------------------- ------------------- HDD: ----------------- ------------------- ------------------- 32.61 +- 1.17 55.11 +- 1.15 54.28 +- 8.82 60.11 +- 2.76 57.93 +- 0.47 58.53 +- 0.51 11.47 +- 0.94 17.29 +- 4.40 ----------------- ------------------- ------------------- Suggested-by: Denis V. Lunev Suggested-by: Vladimir Sementsov-Ogievskiy Signed-off-by: Andrey Shinkevich --- scripts/simplebench/bench_write_req.py | 173 +++++++++++++++++++++++++++++++++ 1 file changed, 173 insertions(+) create mode 100755 scripts/simplebench/bench_write_req.py diff --git a/scripts/simplebench/bench_write_req.py b/scripts/simplebench/bench_write_req.py new file mode 100755 index 0000000..a285ef1 --- /dev/null +++ b/scripts/simplebench/bench_write_req.py @@ -0,0 +1,173 @@ +#!/usr/bin/env python3 +# +# Test to compare performance of write requests for two qemu-img binary files. +# +# 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 . +# + + +import sys +import os +import subprocess +import simplebench + + +def bench_func(env, case): + """ Handle one "cell" of benchmarking table. """ + return bench_write_req(env['qemu_img'], env['image_name'], + case['block_size'], case['block_offset'], + case['requests']) + + +def qemu_img_pipe(*args): + '''Run qemu-img and return its output''' + subp = subprocess.Popen(list(args), + stdout=subprocess.PIPE, + stderr=subprocess.STDOUT, + universal_newlines=True) + exitcode = subp.wait() + if exitcode < 0: + sys.stderr.write('qemu-img received signal %i: %s\n' + % (-exitcode, ' '.join(list(args)))) + return subp.communicate()[0] + + +def bench_write_req(qemu_img, image_name, block_size, block_offset, requests): + """Benchmark write requests + + The function creates a QCOW2 image with the given path/name and fills it + with random data optionally. Then it runs the 'qemu-img bench' command and + makes series of write requests on the image clusters. Finally, it returns + the total time of the write operations on the disk. + + qemu_img -- path to qemu_img executable file + image_name -- QCOW2 image name to create + block_size -- size of a block to write to clusters + block_offset -- offset of the block in clusters + requests -- number of write requests per cluster + + Returns {'seconds': int} on success and {'error': str} on failure. + Return value is compatible with simplebench lib. + """ + + if not os.path.isfile(qemu_img): + print(f'File not found: {qemu_img}') + sys.exit(1) + + image_dir = os.path.dirname(os.path.abspath(image_name)) + if not os.path.isdir(image_dir): + print(f'Path not found: {image_name}') + sys.exit(1) + + cluster_size = 1024 * 1024 + image_size = 1024 * cluster_size + seek = 4 + dd_count = int(image_size / cluster_size) - seek + + args_create = [qemu_img, 'create', '-f', 'qcow2', '-o', + f'cluster_size={cluster_size}', + image_name, str(image_size)] + + count = requests * int(image_size / cluster_size) + step = str(cluster_size) + offset = str(block_offset) + cnt = str(count) + size = [] + if block_size: + size = ['-s', f'{block_size}'] + + args_bench = [qemu_img, 'bench', '-w', '-n', '-t', 'none', '-c', cnt, + '-S', step, '-o', offset, '-f', 'qcow2', image_name] + if block_size: + args_bench.extend(size) + + try: + qemu_img_pipe(*args_create) + except OSError as e: + os.remove(image_name) + return {'error': 'qemu_img create failed: ' + str(e)} + + try: + ret = qemu_img_pipe(*args_bench) + finally: + os.remove(image_name) + if not ret: + return {'error': 'qemu_img bench failed'} + if 'seconds' in ret: + ret_list = ret.split() + index = ret_list.index('seconds.') + return {'seconds': float(ret_list[index-1])} + else: + return {'error': 'qemu_img bench failed: ' + ret} + + +if __name__ == '__main__': + + if len(sys.argv) < 4: + program = os.path.basename(sys.argv[0]) + print(f'USAGE: {program} ' + ' ' + '') + exit(1) + + # Test-cases are "rows" in benchmark resulting table, 'id' is a caption + # for the row, other fields are handled by bench_func. + test_cases = [ + { + 'id': '', + 'block_size': 0, + 'block_offset': 0, + 'requests': 10 + }, + { + 'id': '', + 'block_size': 4096, + 'block_offset': 0, + 'requests': 10 + }, + { + 'id': '', + 'block_size': 4096, + 'block_offset': 524288, + 'requests': 10 + }, + { + 'id': '', + 'block_size': 524288, + 'block_offset': 4096, + 'requests': 2 + }, + ] + + # Test-envs are "columns" in benchmark resulting table, 'id is a caption + # for the column, other fields are handled by bench_func. + # Set the paths below to desired values + test_envs = [ + { + 'id': '', + 'qemu_img': f'{sys.argv[1]}', + 'image_name': f'{sys.argv[3]}' + }, + { + 'id': '', + 'qemu_img': f'{sys.argv[2]}', + 'image_name': f'{sys.argv[3]}' + }, + ] + + result = simplebench.bench(bench_func, test_envs, test_cases, count=3, + initial_run=False) + print(simplebench.ascii(result))