Author: Robert Hyatt
Date: 07:52:52 07/18/04
Go up one level in this thread
On July 18, 2004 at 02:12:58, Sune Fischer wrote: >On July 17, 2004 at 19:39:43, Robert Hyatt wrote: > >>On July 17, 2004 at 17:15:15, Sune Fischer wrote: >> >>>On July 17, 2004 at 16:18:07, Robert Hyatt wrote: >>>> >>>>The correct number is around 45%, gcc 32 bit vs gcc 64 bit, or msvc 32 bit vs >>>>msvc 64 bit. I believe AMD has already published these numbers in fact... >>> >>>...which is still higher than the 1.4 :) >>> >>>>And Microsoft's compiler is at _least_ 10% faster than GCC. More can be said by >>>>Eugene if he wants... >>>> >>>>I was simply pointing out that there was absolutely no way a quad is 4x faster >>>>than a 1-cpu box. >>> >>>Actually there is, if you use a quad 2.4 GHz against a single at 2.0 GHz :) >>> >>>-S. >> >> >>Nope. Again, going over the math. >> >>First, assume that the 2.4ghz machine runs like a 2.2ghz box due to the missing >>NUMA kernel. My testing shows that the 2.2ghz box searched one position at >>2.07M nodes per second (1 cpu) where the 2.4ghz searched the same position at >>2.1M nodes per second, almost identical. > >Missing NUMA kernal and bad compilers, that all software issues. > >So according to you...: > >"That's not my problem. IE he ran on a 64 bit processor. So _hardware_ >advantage is easy to compute. If he didn't compile it correctly, there's little >I can do about that. But the raw _hardware_ advantage is easy to compute. " > >:) > >-S. Correct me if I am wrong, but the issue was "how much faster would falcon have to go to eliminate the hardware advantage Crafty had?" I believe I answered that as clearly as possible. It was _not_ a factor of 4x faster. It was exactly as I stated... It _could_ have been a bit more, perhaps 10%, but that didn't happen. It seems (to me) irrelevant as to what falcon _might_ have been able to do. IE if it was a 32 bit application on a 64 bit machine, that was a choice made by the programmer since 64 bit operating systems are available for the Opteron. I simply responded to the above question...
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