[Python-Dev] subprocess.Popen: change default buffer size?
victor.stinner at haypocalc.com
Mon Nov 24 02:37:59 CET 2008
subprocess.Popen is much SLOWER than os.popen() on Mac and Solaris.
The goal is to read the output of a command (through a pipe) as fast as
possible. The problem is the pipe buffering (the reader file in the Python
Today, subprocess.Popen() uses bufsize=0 by default. It should be
bufsize=(-1): use the system default buffer size.
Note: On Linux the performances between subprocess (unbuffered) and popen()
(buffered) are the same, which is quite strange.
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