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benchmarking script to time the different asyncio write options (#2179)
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import asyncio | ||
import atexit | ||
import math | ||
import os | ||
import signal | ||
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PORT = 8888 | ||
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server = os.fork() | ||
if server == 0: | ||
loop = asyncio.get_event_loop() | ||
coro = asyncio.start_server(lambda *_: None, port=PORT) | ||
loop.run_until_complete(coro) | ||
loop.run_forever() | ||
else: | ||
atexit.register(os.kill, server, signal.SIGTERM) | ||
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async def write_joined_bytearray(writer, chunks): | ||
body = bytearray(chunks[0]) | ||
for c in chunks[1:]: | ||
body += c | ||
writer.write(body) | ||
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async def write_joined_list(writer, chunks): | ||
body = b''.join(chunks) | ||
writer.write(body) | ||
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async def write_separately(writer, chunks): | ||
for c in chunks: | ||
writer.write(c) | ||
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def fm_size(s, _fms=('', 'K', 'M', 'G')): | ||
i = 0 | ||
while s >= 1024: | ||
s /= 1024 | ||
i += 1 | ||
return '{:.0f}{}B'.format(s, _fms[i]) | ||
def fm_time(s, _fms=('', 'm', 'µ', 'n')): | ||
if s == 0: | ||
return '0' | ||
i = 0 | ||
while s < 1: | ||
s *= 1000 | ||
i += 1 | ||
return '{:.2f}{}s'.format(s, _fms[i]) | ||
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writes = [ | ||
("b''.join", write_joined_list), | ||
('bytearray', write_joined_bytearray), | ||
('multiple writes', write_separately), | ||
] | ||
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bodies = ( | ||
[], | ||
[10 * 2 ** 0 ], | ||
[10 * 2 ** 7], | ||
[10 * 2 ** 17], | ||
[10 * 2 ** 27], | ||
[50 * 2 ** 27], | ||
[ 1 * 2 ** 0 for _ in range(10)], | ||
[ 1 * 2 ** 7 for _ in range(10)], | ||
[ 1 * 2 ** 17 for _ in range(10)], | ||
[ 1 * 2 ** 27 for _ in range(10)], | ||
[10 * 2 ** 27 for _ in range(5)], | ||
) | ||
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jobs = [( | ||
# always start with a 256B headers chunk | ||
'{} / {}'.format(fm_size(sum(j) if j else 0), len(j)), | ||
[b'0' * s for s in [256] + list(j)], | ||
) for j in bodies] | ||
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async def time(loop, fn, *args): | ||
spent = [] | ||
while not spent or sum(spent) < .2: | ||
s = loop.time() | ||
await fn(*args) | ||
e = loop.time() | ||
spent.append(e - s) | ||
mean = sum(spent) / len(spent) | ||
sd = sum((x - mean) ** 2 for x in spent) / len(spent) | ||
return len(spent), mean, math.sqrt(sd) | ||
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async def main(loop): | ||
_, writer = await asyncio.open_connection(port=PORT) | ||
print('Loop:', loop) | ||
print('Transport:', writer._transport) | ||
res = [ | ||
('size/chunks', 'Write option', 'Mean', 'Std dev', 'loops', 'Variation'), | ||
] | ||
res.append([':---', ':---', '---:', '---:', '---:', '---:']) | ||
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async def bench(job_title, w, body, base=None): | ||
it, mean, sd = await time(loop, w[1], writer, c) | ||
res.append(( | ||
job_title, | ||
w[0], | ||
fm_time(mean), | ||
fm_time(sd), | ||
str(it), | ||
'{:.2%}'.format(mean / base - 1) if base is not None else '', | ||
)) | ||
return mean | ||
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for t, c in jobs: | ||
print('Doing', t) | ||
base = await bench(t, writes[0], c) | ||
for w in writes[1:]: | ||
await bench('', w, c, base) | ||
with open('bench.md', 'w') as f: | ||
for l in res: | ||
f.write('| {} |\n'.format(' | '.join(l))) | ||
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loop = asyncio.get_event_loop() | ||
loop.run_until_complete(main(loop)) |