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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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Antoine Pitrou 2010-06-02 17:10:49 +00:00
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Doc/library/subprocess.rst
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@ -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 size. A negative *bufsize* means to use the system default, which usually means
fully buffered. The default value for *bufsize* is :const:`0` (unbuffered). 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 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 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, ``shell=True``, the *executable* argument specifies which shell to use. On Unix,