96 lines
3.3 KiB
Python
Executable File
96 lines
3.3 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Process img-bench test templates
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#
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# Copyright (c) 2021 Virtuozzo International GmbH.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import sys
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import subprocess
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import re
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import json
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import simplebench
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from results_to_text import results_to_text
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from table_templater import Templater
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def bench_func(env, case):
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test = templater.gen(env['data'], case['data'])
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p = subprocess.run(test, shell=True, stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT, universal_newlines=True)
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if p.returncode == 0:
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try:
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m = re.search(r'Run completed in (\d+.\d+) seconds.', p.stdout)
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return {'seconds': float(m.group(1))}
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except Exception:
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return {'error': f'failed to parse qemu-img output: {p.stdout}'}
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else:
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return {'error': f'qemu-img failed: {p.returncode}: {p.stdout}'}
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if __name__ == '__main__':
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if len(sys.argv) > 1:
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print("""
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Usage: img_bench_templater.py < path/to/test-template.sh
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This script generates performance tests from a test template (example below),
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runs them, and displays the results in a table. The template is read from
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stdin. It must be written in bash and end with a `qemu-img bench` invocation
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(whose result is parsed to get the test instance’s result).
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Use the following syntax in the template to create the various different test
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instances:
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column templating: {var1|var2|...} - test will use different values in
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different columns. You may use several {} constructions in the test, in this
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case product of all choice-sets will be used.
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row templating: [var1|var2|...] - similar thing to define rows (test-cases)
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Test template example:
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Assume you want to compare two qemu-img binaries, called qemu-img-old and
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qemu-img-new in your build directory in two test-cases with 4K writes and 64K
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writes. The template may look like this:
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qemu_img=/path/to/qemu/build/qemu-img-{old|new}
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$qemu_img create -f qcow2 /ssd/x.qcow2 1G
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$qemu_img bench -c 100 -d 8 [-s 4K|-s 64K] -w -t none -n /ssd/x.qcow2
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When passing this to stdin of img_bench_templater.py, the resulting comparison
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table will contain two columns (for two binaries) and two rows (for two
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test-cases).
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In addition to displaying the results, script also stores results in JSON
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format into results.json file in current directory.
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""")
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sys.exit()
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templater = Templater(sys.stdin.read())
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envs = [{'id': ' / '.join(x), 'data': x} for x in templater.columns]
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cases = [{'id': ' / '.join(x), 'data': x} for x in templater.rows]
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result = simplebench.bench(bench_func, envs, cases, count=5,
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initial_run=False)
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print(results_to_text(result))
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with open('results.json', 'w') as f:
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json.dump(result, f, indent=4)
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