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#!/usr/bin/env python3
"""Run bench.c in copy and draft modes on a real device, alternating order."""
import argparse
import json
import platform
import shutil
import subprocess
from pathlib import Path
HERE = Path(__file__).resolve().parent
ROOT = HERE.parents[2]
def main():
parser = argparse.ArgumentParser()
parser.add_argument('--work', type=Path, default=ROOT / 'build' / 'bench-drafts')
parser.add_argument('--size', type=int, default=1048576)
parser.add_argument('--saves', type=int, default=24)
parser.add_argument('--rounds', type=int, default=3)
parser.add_argument('--output', type=Path)
args = parser.parse_args()
shutil.rmtree(args.work, ignore_errors=True)
args.work.mkdir(parents=True)
device = subprocess.check_output(['findmnt', '-n', '-T', str(args.work), '-o', 'SOURCE,FSTYPE'], text=True).split()
assert device[1] != 'tmpfs', 'fsync is free on tmpfs'
binary = args.work / 'bench'
subprocess.run(['cc', '-std=c17', '-O2', '-Wall', '-Wextra', '-Werror', f'-I{ROOT / "core"}',
str(HERE / 'bench.c'), str(ROOT / 'store' / 'store-tree.c'), '-o', str(binary)], check=True)
runs = []
for round_number in range(args.rounds):
for mode in (('copy', 'draft') if round_number % 2 == 0 else ('draft', 'copy')):
directory = args.work / f'{mode}-{round_number}'
subprocess.run([str(binary), 'create', str(directory), str(args.size), '0'], check=True)
line = subprocess.check_output([str(binary), mode, str(directory), str(args.size), str(args.saves)], text=True)
runs.append(json.loads(line))
print(line.strip(), flush=True)
shutil.rmtree(directory)
report = {'device': device[0], 'filesystem': device[1], 'machine': platform.machine(),
'kernel': platform.release(), 'store': 'store-tree.c', 'runs': runs}
if args.output:
args.output.write_text(json.dumps(report, indent=2) + '\n')
if __name__ == '__main__':
main()
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