Author: Jeremiah Penery
Date: 15:39:00 06/18/03
Go up one level in this thread
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.
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