[issue11314] Subprocess suffers 40% process creation overhead penalty

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> os.popen is 41% is slower than subprocess: I suppose that it 
> is the usage of stdout=PIPE (creation of the pipe) which make 
> it slower

Oh no, it's because os.popen() calls subprocess.Popen() with shell=True: the overhead is the shell. Nothing wrong here.

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<http://bugs.python.org/issue11314>
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