From: Antoine Pitrou Date: Wed, 2 Jun 2010 17:10:45 +0000 (+0000) Subject: Merged revisions 81652 via svnmerge from X-Git-Tag: v2.6.6rc1~222 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b56b50ddd149fd0d81e8b37d38efac60e736da9e;p=thirdparty%2FPython%2Fcpython.git Merged revisions 81652 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ 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. ........ --- diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst index 967c4a97ee20..ffa880fa00d1 100644 --- a/Doc/library/subprocess.rst +++ b/Doc/library/subprocess.rst @@ -94,6 +94,12 @@ 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,