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| author | Antoine Pitrou <solipsis@pitrou.net> | 2010-06-02 17:10:49 (GMT) |
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| committer | Antoine Pitrou <solipsis@pitrou.net> | 2010-06-02 17:10:49 (GMT) |
| commit | 4b87620d5dde50949ef820ed241d9883ac9f96de (patch) | |
| tree | bfeb9cf1ac4a5cd96be62dea2918a660fe058c09 /Doc/library/subprocess.rst | |
| parent | 82bfcc87f023c0423443c6691b1d9ad2db4fb4a5 (diff) | |
| download | cpython-4b87620d5dde50949ef820ed241d9883ac9f96de.zip cpython-4b87620d5dde50949ef820ed241d9883ac9f96de.tar.gz cpython-4b87620d5dde50949ef820ed241d9883ac9f96de.tar.bz2 | |
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 4b19761..c7a349b 100644 --- a/Doc/library/subprocess.rst +++ b/Doc/library/subprocess.rst @@ -89,6 +89,12 @@ 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, |