Author: Steffen Basting
Date: 11:17:55 02/19/03
Hi! I've posted some benchmark results on my PIV 3.06 earlier and your 1.33 factor in speed up seems to be a little too optimistic. Crafty benefits most from hyperthreading (about 20%), the usual nodes per second increase (Deep Shredder 6 and Deep Fritz 7) is about 10% at maximum. Perhaps Xeons perform better, but I don't think the hyperthreading performance differs too much. ----- Crafty, 1 Thread ----- White(1): hash 96M hash table memory = 96M bytes. White(1): smpmt=0 parallel threads disabled. White(1): bench Running benchmark. . . ...... Total nodes: 48447803 Raw nodes per second: 1211195 Total elapsed time: 40 SMP time-to-ply measurement: 16.000000 ----- Crafty, 2 Threads ----- White(1): hash 96M hash table memory = 96M bytes. White(1): smpmt=2 max threads set to 2 White(1): bench Running benchmark. . . ...... Total nodes: 48586305 Raw nodes per second: 1429008 Total elapsed time: 34 SMP time-to-ply measurement: 18.823529 ----- Shredder 6-Mark, 1 Thread ----- 655+-44, 490kn/s ----- Shredder 6-Mark, 2 Threads ----- 696+-45, 502kn/s ----- Deep Fritz 7-Mark, 1 Thread ----- 1433+-0, 1193kn/s ----- Deep Fritz 7-Mark, 2 Threads ----- 1602+-0, 1352kn/s Regards, Steffen. PS: The Crafty version I used was 18.6-smp from Bob's site, perhaps newer versions are optimized for hyperthreading?
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