Author: Jay Scott
Date: 17:11:39 01/24/98
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On January 21, 1998 at 18:18:17, John Scalo wrote: >On my PowerBook G3/250 (hash table = 768k, pawn hash = 80k) -- ... > time: 3.43 cpu:100% mat:0 n:212481 nps:61947 I found this strangely slow, and just got around to running some tests today. I used a PowerMac 7200/90 with a G3 upgrade card, whose specs I do not know. :-( But I ran the same test and got nearly identical results, so it's comparable to the PowerBook. Searching to depth 9, to get a longer baseline, gave ~67 nps, not significantly different. Then I tried MacChess 4.0. Searching to depth 7 took it less than one second and didn't give an accurate speed, so I went to depth 9. It reported ~250K nps. From my experience, that's at the lower end of its normal range--it's what you'd expect in this position. Considering chip performance alone, I'd expect crafty to run rather faster on a G3 Mac than on a PPro 200. But Bob reports: >same ballpark as pentium pro 200... MacChess is definitely not as smart a program as crafty, but I don't think it's 3.7 times dumber. :-) And of course it's optimized for the PowerMac, while crafty is optimized for an Intel box. I can't prove anything, but from the numbers I suspect that crafty's taking a big hit on the Mac from some compiler deficiency or sneaky implementation detail. Jay
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