Author: Charles Worthington
Date: 12:08:24 02/19/03
Go up one level in this thread
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. > >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. >> Im not actually counting on the 1.33 at any rate. In reality the hyperthreading multiple is just a bonus for me. The bottom line though: Hyperthreading 10% or 30% this machine will be very fast indeed! Charles >>----- 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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