Author: Robert Hyatt
Date: 12:14:30 06/21/02
Go up one level in this thread
On June 21, 2002 at 14:51:14, Robert Henry Durrett wrote: >On June 21, 2002 at 14:36:13, Dann Corbit wrote: > >>On June 21, 2002 at 08:30:45, Robert Henry Durrett wrote: >> >>> >>>Soon, maybe next Spring, Intel and AMD will have their advanced 64-bit >>>microprocessors out and, hopefully, they will be well-suited for Quad Crafty >>>chess engines. Will AMD be the winner in this "Crafty Competition"? >> >>Doubt it. The fastest crafty on SMP will be one with really big on-die cache. >>If the Hammer line makes something with huge cache like the Intel Xeon, then it >>might be competitive. Eugene's benchmark of a 2 CPU AMD system showed a 40% >>gain for the second CPU. 60% loss is a bit disappointing. >> >>With the Xeon that Bob uses, there is a very tiny SMP loss of only a few >>percent. > >Will Itaniums also have this "huge cache" advantage over hammers? Especially >interested in Madison Itaniums compared to equivalent Hammers. > >Is there a 64-bit Xeon? I thought they were all 32-bit. > >[Note: Would be misleading to compare 3rd generation of one processor to 1st >generation of the other. Need to consider what each, Intel & AMD, will have out >at the same time.] > >Bob D. Huge cache is not necessary. Crafty's SMP performance is similar whether it is on a quad pentium pro 200mhz, quad xeon/400, quad xeon/550 or my quad xeon/700. The SMP "loss" is only a few percent per cpu added. The P6/200 quad has the normal 256K L2 cache. the xeon 400's and 550's have 512K, while my 700's have 1024K (I wouldn't have bought the 1024's but that is all that was available in 700, except for the 2048K chips that are extremely pricey. Note that all the quads above have classic 4-way memory interleaving, while duals generally do not. I think _that_ is the big difference. Not the L2 cache or anything else. Just pure memory bandwidth and 4-way interleaving just about quadruples thruput...
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