On 9/12/07, Gregory P. Smith <[EMAIL PROTECTED]> wrote: > [cpu rant] > Off topic: not true. The Pentium D is the final Pentium 4 netburst > architecture based design. It is not at all close to the Pentium M. The M > is much more a derivative of the pentium pro,ii,iii, & iii-m before it as > core and more distantly core2 are follow ons to the M. Yes the D (50xx) and > Woodcrest core2s (51xx) shared the same socket and front side bus but > internally they are unrelated. > [/cpu rant]
Yeah, my mistake, I misread intel's NetBurst page. I should have stuck with Wikipedia (who knew). > Regardless comparing between different cpus doesn't matter, only the > difference between runs on the same cpu. I agree. > for instance on a 1.4Ghz efficeon: > > python2.5: > 10 loops, best of 3: 932 msec per loop > python 3.0a1 svn trunk: > 10 loops, best of 3: 1.54 sec per loop > > (both compiled with gcc 4.1.2 -O3) > > which falls right smack in the middle of the measurements others were > reporting in this thread. ;) I should look at a comparison of 2.5 and 2.6 at some point, for better reference. > > Without looking into it at a much lower level, > > it's hard to tell, but the difference between a 1MB and 2MB L2 cache > > might make all the difference in 3.0 performance. > > doubtful, python's ceval core and the data representing the code being > executed are both tiny. Makes me miss the G4/5 version of Shark on MacOS X, which would show you the pipelining in the processor and cache utilization, so you could actually see what was going on - the x86 Shark doesn't seem to have this capability. It's suitably interesting on my windows xp machine to turn processor affinity off and see the performance go to hell in a handbasket. (Why, oh why, does windows insist on moving processes between CPUs all the time?) -- Nick _______________________________________________ Python-3000 mailing list [email protected] http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
