Author: Sune Fischer
Date: 21:55:31 03/25/02
Go up one level in this thread
On March 25, 2002 at 18:15:54, Jeremiah Penery wrote: >On March 25, 2002 at 08:48:54, Sune Fischer wrote: > >>On March 25, 2002 at 08:00:18, Vincent Diepeveen wrote: >> >>>On March 25, 2002 at 07:52:12, Sune Fischer wrote: >>> >>>>On March 25, 2002 at 07:05:26, Vincent Diepeveen wrote: >>>> >>>>>The only INTERESTING thing is how fast a processor + compiler performs >>>>>for a program. If you build a 1Ghz processor, then it gotta beat >>>>>a 2Ghz K7 simply. If it doesn't, THEN YOU ARE SLOWER. >>>> >>>>Actually, it might beat it: >>> >>>>"In SPEC CFP2000 the Alpha 21264A running at 667MHz can outperform our beloved >>>>AMD Athlon at over 2x the clock speed, not to mention that Intel's own Itanium >>>>only runs at 800MHz while providing even higher scores." >>> >>>that's the floating point unit Sune. not a single chessprogram is >>>using much floating point. also floating point isn't faster than >>>integers (otherwise we could rewrite stuff to floating point). >>> >>>Just look how fast the best prepared alpha machine at specINT is >>>completely outgunned by XP2000 (=mp2000). >> >>That is true when talking about the Alpha, it was probably not designed to be >>very integer fast, I've even heard it couldn't do integers, that it would just > >The Alpha is just as much faster than other processors in Integer operations as >it is in FP ones. Well lets not split hairs on this, I think the alpha was designed primarily to do floating point ops. It is still pretty fast on the integers though: http://www.redhill.net.au/hw-cpu-test-nonx86.html >>cast from floats. Don't know if that is true or not, but why would the Hammer >>have the same weakness? >>Look at the specs for the Hammer, it looks as though it will be 2x faster at >>64-bit int-operations. > >2x faster than what? Everything I've read indicates the Hammer will be about >25% faster than the AthlonXP clock for clock in 32-bit mode, and going to 64-bit >mode will give another 15-20% speed boost, mostly due to the extra GP registers. > Maybe for a bitboard-based program like Crafty, it would get even more of a >speed boost. The second part of thet doesn't really make any sense to me, "15-20% speed boost" on 64 bit-operations???? First of all, why would Crafty then "get even more of a speed boost" and second why not a clear factor 2 in speed (assuming everything runs in cache so not to waste bandwith)? The registers are 64-bit, so that is twice the operational bit capacity clock for clock over a 32 bit chip. -S.
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