[New-bugs-announce] [issue4194] Miserable subprocess.Popen performance
Skip Montanaro
report at bugs.python.org
Fri Oct 24 19:54:42 CEST 2008
New submission from Skip Montanaro <skip at pobox.com>:
I noticed a colleague at work today checked in a change to his code to
switch back from subprocess.Popen to os.popen. I asked him about it and he
reported that subprocess.Popen was about 10x slower than os.popen. I asked
him for a simple test case, which is attached. Here are my results with
Python 2.4 through 2.7 (aka CVS HEAD):
tmp% python2.4 popentest.py
time with os.popen : 0.09
time with subprocess.Popen : 2.27
tmp% python2.5 popentest.py
time with os.popen : 0.03
time with subprocess.Popen : 1.52
tmp% python2.6 popentest.py
time with os.popen : 0.038824
time with subprocess.Popen : 1.517056
tmp% python2.7 popentest.py
time with os.popen : 0.033746
time with subprocess.Popen : 1.512331
These times are on my Mac laptop, all writing to the local disk. It seems
there was a bit of improvement in the 2.5 release but that it is still
miserably slow when compared with os.popen.
His original test used time.clock() as the timer. I changed to time.time()
but got essentially the same result.
Skip
----------
files: popentest.py
messages: 75173
nosy: skip.montanaro
severity: normal
status: open
title: Miserable subprocess.Popen performance
Added file: http://bugs.python.org/file11871/popentest.py
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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4194>
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