On Thu, Aug 25, 2005 at 01:35:04PM -0400, Bill Mill wrote: > On 8/25/05, Erik Max Francis <[EMAIL PROTECTED]> wrote: > > Mark Dickinson wrote: > > > > > Questions: > > > > > > (1) Can anyone else reproduce this behaviour, or is it just some quirk > > > of my setup? > > > (2) Any possible explanations? Is there some optimization that kicks > > > in at a certain number of lines, or at a certain length of > > > bytecode? > > > (3) If (2), is there some way to force the optimization, so that I can > > > get the speed increase without having to add the extra lines? > > > > I did find, though, that if I remove all print statements from the > program, the dummy and non-dummy variable versions take indentical > time. Can others reproduce this? > > I'm Investigating further...
I'm getting similarly freakish results. I tried a little ghetto debugging by putting a printf in dictobject.c's resize method and recompiling python. Sadly I can't get the problem to reproduce itself with the new binary (with or without the printf). The Ubuntu default 2.4.1 is sometimes fast, my hand compiled one (./configure && make) is always slow. There are some very arcane low level things going on here. sprat:~/src/Python-2.4.1# time ./python /tmp/odd.py > /dev/null 7.876u 0.008s 0:07.91 99.4% 0+0k 0+0io 0pf+0w sprat:~/src/Python-2.4.1# time python /tmp/odd.py > /dev/null 1.813u 0.004s 0:01.77 102.2% 0+0k 0+0io 0pf+0w sprat:~/src/Python-2.4.1# ./python Python 2.4.1 (#5, Aug 25 2005, 13:55:44) [GCC 3.3.5 (Debian 1:3.3.5-8ubuntu2)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> sprat:~/src/Python-2.4.1# python Python 2.4.1 (#2, Mar 30 2005, 21:51:10) [GCC 3.3.5 (Debian 1:3.3.5-8ubuntu2)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> No-idea-ly, -jackdied -- http://mail.python.org/mailman/listinfo/python-list