STINNER Victor <[EMAIL PROTECTED]> added the comment: > Victor> About Python3, os.popen() is more than two times faster (...) > Victor> The difference is just this instruction: > Victor> stdout = io.TextIOWrapper(stdout) > > This is a known issue. The default for bufsize in os.popen is -1 (fully > buffered? line buffered?). The default for bufsize in subprocess.Popen is > 0 (unbuffered).
Wrong, it's not related to the buffer size. With Python3 trunk on Linux, os.popen time is ~0.10 sec whereas subprocess.Popen is ~0.25 sec. Change the buffer size of subprocess doesn't help: - (default) 0.25 - buffering = (-1): 0.25 - buffering = 1: 0.25 - buffering = 8192: 0.26 - buffering = 16384: 0.26 (it's a little big slower with a bigger buffer...) You get the same speed (than os.popen) using TextIOWrapper() adapter: [i for i in read_handle] => 0.25 sec [i for i in io.TextIOWrapper(read_handle)] => 0.10 sec WTF? Unicode is *FASTER* than raw bytes? _______________________________________ 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
