Winfried Plappert <[EMAIL PROTECTED]> added the comment: The created testfile size is 588890 bytes, which implies that subprocess.Popen reads the file in completely unbuffered mode, one byte at a time. If I modify the popentest.py programme by specifying a bufsize of 1_000_000, the execution time drops quite a bit: time with os.popen 0.069 sec time with subprocess.Popen 0.118 sec This Solaris 9/Python 2.6.
I think I have got it: Lib/subprocess.py should have a default bufsize of -1, not 0! I tested it by modifying the subprocess.Popen call and here is the result: time with os.popen 0.086 sec time with subprocess.Popen 0.080 sec See also Modules/posixmodule.c. _______________________________________ Python tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue4194> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
