Author: Charles Worthington
Date: 12:59:57 02/19/03
Go up one level in this thread
On February 19, 2003 at 15:38:02, martin fierz wrote: >On February 19, 2003 at 14:57:18, Aaron Gordon wrote: > >>Hyatt has two CPUs. Each CPU will provide about a 16% boost in crafty from >>Hyper-threading so 16% X 2 = 32%. Pretty much identical to his claim. > >i don't follow this math. one CPU = 100%, hyperthreading on =116%. >by this account 2 CPUs are 200% and hyperthreading 2*116=232%. that is >still only a 16% speedup... > >cheers > martin >Actally martin it is 32% it is 16% per cpu times 2. The math is correct. Charles > >>Now, I'd prefer if when he said this he did it in a bit more detail instead of >>saying, "Oh, Hyperthreading gives you a 30-33% boost". IMO it should be worded, >>"With two Xeon chips hyperthreading produces around a 30% speedup in Crafty. >>This is around 15% per cpu". >> >>On February 19, 2003 at 14:17:55, Steffen Basting wrote: >> >>>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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