Author: Robert Hyatt
Date: 13:45:52 06/19/03
Go up one level in this thread
On June 18, 2003 at 18:39:00, Jeremiah Penery wrote: >On June 18, 2003 at 06:05:52, Aaron Gordon wrote: > >>On June 18, 2003 at 00:23:04, Jeremiah Penery wrote: >> >>>On June 17, 2003 at 19:01:25, Aaron Gordon wrote: >>> >>>>On June 17, 2003 at 01:41:59, Jeremiah Penery wrote: >>>> >>>>>On June 16, 2003 at 23:17:12, Jay Urbanski wrote: >>>>> >>>>>>On June 15, 2003 at 19:04:02, Vincent Lejeune wrote: >>>>>> >>>>>>>Could we get result for 2 crafty bench in same time (one by CPU), please ? >>>>>> >>>>>>Sure. >>>>>> >>>>>>CPU 0 >>>>>>Raw nodes per second: 1150676 >>>>> >>>>>>CPU 1 >>>>>>Raw nodes per second: 1150676 >>>>> >>>>> >>>>>That's almost impossible to believe. >>>> >>>>My dual Athlon shows the same almost.. check out my previous post to Hyatt. >>>> >>>>http://www.talkchess.com/forums/1/message.html?300395 >>>> >>>>1.995x speedup running two copies of Crafty, one per cpu. 1.6x speedup with 1 >>>>Crafty, 2 cpus. This is a Crafty problem however and it's also occuring on >>>>Hyatt's dual Xeon system.. he's currently looking into the problem. >>> >>>Your system shows *identical* NPS for 2 concurrent bench tests? >> >>Yes. I think Crafty has an inaccurate timer. Like taking 28718972 nodes (for >>example) and dividing it by 15, 16, 17 (seconds). Would be better if Hyatt used >>a more precise timer I believe. Not sure what, but, this old one is the one I >>always use... I'm sure he's got something better. Just incase, here you go... > >Ok, I see the problem. For some reason, the bench command is calculating NPS >with a time granularity of seconds, rather than the centiseconds used elsewhere >in the program. Maybe I'll hack a fix for this and send it to Bob. That's possible, since I didn't write the bench code. Not sure why it would be done in second granularity other than to perhaps forget about the 1/100ths for simplicity in displaying the output.
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