Author: Mridul Muralidharan
Date: 01:58:51 12/27/03
Go up one level in this thread
On December 26, 2003 at 19:29:57, Robert Hyatt wrote: >On December 26, 2003 at 18:40:57, Mridul Muralidharan wrote: > >>On December 26, 2003 at 16:13:26, Luis Smith wrote: >> >>>On December 26, 2003 at 15:34:43, Darren Rushton wrote: >>> >>>>>Actually what happens, is the 366 is SLOW. And I mean SLOW. >>>> >>>>I don't intend to be controversial here, but the conclusion I draw from your >>>>results is that Shredder 7 is such a brilliant program it is almost a match for >>>>the one of the better amateur programs on hardware that's almost 10 times >>>>slower. >>>> >>>>Regards, >>>> >>>>Darren >>> >>>I think you're missing the point of these experiments. Some people here were >>>saying that Crafty isn't a world contender. Bob could get much better hardware >>>than most of the commercials. He mentioned something about a 32 way box. Can >>>you imagine the speed of Crafty on something like that? >>> >>>I don't think anyone can count Crafty out after this experiment. >> >>You also need to get decent speedup on those boxes :) >>And I hope it is not a shared bus 32 proc bus ;) >> >>A 4/8 cpu opteron against a 32 proc alpha is not fair - for crafty - it would >>lose again against say shredder or fritz. >> >>Mridul > > >I'm not sure what you are saying in the above? The 4-8cpu opteron will not >run programs well without some work. I've already done it. Just dropping >in deep fritz or something similar will not produce great results, from past >experience. As far as 32 proc alpha, it depends on the box. I got reasonable >scaling on the 32 cpu version I used last year at Compaq. 4 things are important here. 1) If deep fritz/shredder/etc gets released which supports quad/8 way opteron - then it will be ported and tested. And the authors will ensure that there is a decent speedup. Dont tell me that they are never going to figure out how to get their program working on a numa opteron box :) - Nalimov could have a good job at crafty - but even other people would figure out what to do from their specs and docs. And I have a suspicion that some already have ;) 2) The alpha proc has a disadvantage in latency and processing power w.r.t the opteron - so it is never a 1:4 or 1:8 h/w advantage between the two machines - much lower. Also - what is crafty speedup here ? Any numbers ? What kind of machine is it ? Shared bus ? - in which case you are dead due to bus contention. numa ? - I thought you said crafty works only on windows and intel/amd. You have crafty working for alpha also ? 3) A program scaling at 4 or 8 proc is going to be much higher than at 16 or 32. 4) Even with a 1:10 or 1:8 advantage crafty only barely manages to catch up or beat these top order programs - so not much of a chance if they show up with the above mentioned machines. Mridul
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