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#!/usr/bin/env python3
# Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
A simple micro benchmark script which prints the speedup when using
Process.oneshot() ctx manager.
See: https://github.com/giampaolo/psutil/issues/799
"""
from __future__ import division
from __future__ import print_function
import sys
import textwrap
import timeit
import psutil
ITERATIONS = 1000
# The list of Process methods which gets collected in one shot and
# as such get advantage of the speedup.
names = [
'cpu_times',
'cpu_percent',
'memory_info',
'memory_percent',
'ppid',
'parent',
]
if psutil.POSIX:
names.append('uids')
names.append('username')
if psutil.LINUX:
names += [
# 'memory_full_info',
# 'memory_maps',
'cpu_num',
'cpu_times',
'gids',
'name',
'num_ctx_switches',
'num_threads',
'ppid',
'status',
'terminal',
'uids',
]
elif psutil.BSD:
names = [
'cpu_times',
'gids',
'io_counters',
'memory_full_info',
'memory_info',
'name',
'num_ctx_switches',
'ppid',
'status',
'terminal',
'uids',
]
if psutil.FREEBSD:
names.append('cpu_num')
elif psutil.SUNOS:
names += [
'cmdline',
'gids',
'memory_full_info',
'memory_info',
'name',
'num_threads',
'ppid',
'status',
'terminal',
'uids',
]
elif psutil.MACOS:
names += [
'cpu_times',
'create_time',
'gids',
'memory_info',
'name',
'num_ctx_switches',
'num_threads',
'ppid',
'terminal',
'uids',
]
elif psutil.WINDOWS:
names += [
'num_ctx_switches',
'num_threads',
# dual implementation, called in case of AccessDenied
'num_handles',
'cpu_times',
'create_time',
'num_threads',
'io_counters',
'memory_info',
]
names = sorted(set(names))
setup = textwrap.dedent("""
from __main__ import names
import psutil
def call_normal(funs):
for fun in funs:
fun()
def call_oneshot(funs):
with p.oneshot():
for fun in funs:
fun()
p = psutil.Process()
funs = [getattr(p, n) for n in names]
""")
def main():
print("%s methods involved on platform %r (%s iterations, psutil %s):" % (
len(names), sys.platform, ITERATIONS, psutil.__version__))
for name in sorted(names):
print(" " + name)
# "normal" run
elapsed1 = timeit.timeit(
"call_normal(funs)", setup=setup, number=ITERATIONS)
print("normal: %.3f secs" % elapsed1)
# "one shot" run
elapsed2 = timeit.timeit(
"call_oneshot(funs)", setup=setup, number=ITERATIONS)
print("onshot: %.3f secs" % elapsed2)
# done
if elapsed2 < elapsed1:
print("speedup: +%.2fx" % (elapsed1 / elapsed2))
elif elapsed2 > elapsed1:
print("slowdown: -%.2fx" % (elapsed2 / elapsed1))
else:
print("same speed")
if __name__ == '__main__':
main()
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