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| author | Antoine Pitrou <solipsis@pitrou.net> | 2010-06-02 17:11:32 (GMT) |
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| committer | Antoine Pitrou <solipsis@pitrou.net> | 2010-06-02 17:11:32 (GMT) |
| commit | 5050bb2e50f4035040380489c2e1d16cd59d51fa (patch) | |
| tree | c209f6f60e93b9f7fe4691746c81e815a713b46d /Doc/library/subprocess.rst | |
| parent | aa47f0ead8a88e66f774e56623d17dc55146197e (diff) | |
| download | cpython-5050bb2e50f4035040380489c2e1d16cd59d51fa.zip cpython-5050bb2e50f4035040380489c2e1d16cd59d51fa.tar.gz cpython-5050bb2e50f4035040380489c2e1d16cd59d51fa.tar.bz2 | |
Merged revisions 81654 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k
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r81654 | antoine.pitrou | 2010-06-02 19:10:49 +0200 (mer., 02 juin 2010) | 10 lines
Merged revisions 81652 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r81652 | antoine.pitrou | 2010-06-02 19:08:47 +0200 (mer., 02 juin 2010) | 4 lines
Issue #8873: add a documentation note about possible performance issues with the
default of unbuffered IO in subprocess.Popen.
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Diffstat (limited to 'Doc/library/subprocess.rst')
| -rw-r--r-- | Doc/library/subprocess.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst index 834ec58..2c39551 100644 --- a/Doc/library/subprocess.rst +++ b/Doc/library/subprocess.rst @@ -88,6 +88,12 @@ This module defines one class called :class:`Popen`: size. A negative *bufsize* means to use the system default, which usually means fully buffered. The default value for *bufsize* is :const:`0` (unbuffered). + .. note:: + + If you experience performance issues, it is recommended that you try to + enable buffering by setting *bufsize* to either -1 or a large enough + positive value (such as 4096). + The *executable* argument specifies the program to execute. It is very seldom needed: Usually, the program to execute is defined by the *args* argument. If ``shell=True``, the *executable* argument specifies which shell to use. On Unix, |