Author: Eugene Nalimov
Date: 18:05:31 11/11/03
Go up one level in this thread
On November 11, 2003 at 19:55:22, Aaron Gordon wrote: >On November 11, 2003 at 17:38:38, Eugene Nalimov wrote: > >>On November 11, 2003 at 08:50:53, Aaron Gordon wrote: >> >>>It would be better had they used a quad or 8-way Opteron running 2GHz or more. >>>From some testing I've done in the past you can figure a single Opteron 2GHz == >>>a P4-3.6GHz in Fritz 8 (32bit mode). So, a Quad Opteron 2.0 == Quad P4-3.6. >>>Almost 30% faster, plus the memory bandwidth available would probably push it a >>>bit over that with large hash table sizes. 8-way Opteron 2.0 would of course be >>>like 8 p4-3.6's (however with some 40gb/s+ memory bandwidth available depending >>>on bus speed). >>> >>>Why not use the best hardware? Seems like if you'd want to promote your new >>>'awesome' chess program you'd want to give it the best chance of winning. >> >>I am not so sure that for SMP program that is not NUMA-aware quad Opteron will >>be faster than quad Xeon, even if single-CPU Opteron is faster than single-CPU >>Xeon. >> >>At least it was so for Crafty. Before we modified it to be NUMA-aware, 1.8GHz >>Opteron was faster than 1.5GHz Itanium, but quad 1.4GHz Itanium was faster than >>quad 1.5GHz Opteron. Actually, Itanium was slightly faster even on 2 CPUs. >> >>Thanks, >>Eugene > >Fritz doesn't run on the Itanium platform that I'm aware of.. not without >emulation. All of the Itanium emulation I've seen runs like a 486.. so.. back to >the 4 to 8-way Opteron arguement I go. :) I gave numbers for Crafty. Not for Fritz, Chess Tiger, Hiarcs, etc. I definitely told so in my post. Ok, trying to re-phrase it: You told: "For program 'F' single-CPU system 'O' is 30% faster than system 'P', so quad system 'O' is definitely faster than quad system 'P'". I answered: "Not necessary. For (another) program 'C' (prior to my NUMA modifications) single-CPU system 'O' is faster than system 'I', bud quad system 'O' is noticeable slower than quad system 'I'". Yes, I did not have the exact numbers for Fritz. But the numbers I have suggest that quad system 'P' can in fact be faster than system 'O'. It's hard to say without measuring... Thanks, Eugene
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