Author: Mihaly Szalai
Date: 12:46:52 11/01/05
Go up one level in this thread
On November 01, 2005 at 15:17:41, Eugene Nalimov wrote: >On November 01, 2005 at 14:45:17, Aaron Gordon wrote: > >>On November 01, 2005 at 13:21:05, Gabor Szots wrote: >> >>>On November 01, 2005 at 12:41:25, Aaron Gordon wrote: >>> >>>>>Thanks, Günther. A disappointment as P4 is concerned... >>>>> >>>>>Regards, >>>>>Gábor >>>> >>>>As far as HT goes, please take Hyatts advice there. I don't know the exact >>>>numbers, but here is a decent example. Lets say you've got a dual CPU system >>>>where 1 cpu takes 60 seconds to hit 16 ply. As soon as you switch to 2 >>>>threads/cpus, you get a 20% performance decrease. So, lets figure two cpus that >>>>can do 16 ply in 60 seconds a piece, minus 20%. That puts us at ~36 seconds, a >>>>nice improvement over 1 cpu. >>>> >>>>Now, with HT, it isn't a real second CPU. So, lets say we take that same >>>>performance decrease and see what it does with HT enabled. >>>>60 seconds per cpu again, 1 cpu. HT will probably benefit you about 10%, but, >>>>going into SMP mode again drops you 20%. So, you actually lose performance. Now >>>>your 60 second time turns into about 64.8 seconds (if I did my math properly, >>>>heh). >>>> >>>>Here are some benchmarks I ran to compare a few systems. This is with Crafty >>>>19.15 compiled by Bryan Hofmann (http://cito.atspace.com/) run with the "bench" >>>>command and 48mb hash. I would have enabled HT for the P4 test, however, my P4 >>>>does not have HT. >>>> >>>>3054kn/s - Athlon 64 2.85GHz (San Diego) 64 bit >>>>2149kn/s - Athlon 64 2.85GHz (San Diego) 32 bit >>>>1934kn/s - Athlon 64 1.80GHz (San Diego) 64 bit >>>>1612kn/s - Athlon XP 2.50GHz (Barton) 32 bit >>>>1350kn/s - Athlon 64 1.80GHz (San Diego) 32 bit >>>>1209kn/s - Pentium 4 3.0GHz (Northwood) 32 bit >>>>1095kn/s - Athlon XP 2500+ 1.83GHz (Barton) 32 bit >>> >>>Thanks, Aaron. The last line corresponds to my system. I got 1089 on my Barton. >> >>Do you know if the P4-3GHz you have is a Northwood or Prescott? I think the >>Prescotts can be up to 20% slower than Northwoods at chess, unfortunately. Could >>you test yours and see how it compares? Thanks. > >My dual-core 3GHz Intel system runs that executable (single-threaded) at >1,185knps. I believe all dual-core Intel CPUs are Prescott-based -- CPUINFO >gives "Family 15, Model 6, Stepping 1. " > >Thanks, >Eugene My 3 GHz Intel Prescott (Family 15, Model 3, Stepping 4.) gives 1289 kN/s. Mihaly
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