Author: Eugene Nalimov
Date: 16:10:25 06/25/02
Go up one level in this thread
On June 25, 2002 at 17:28:48, J. Wesley Cleveland wrote: >On June 25, 2002 at 17:12:31, Robert Hyatt wrote: > >>On June 25, 2002 at 07:54:35, Vincent Lejeune wrote: >> >>>On June 25, 2002 at 05:09:04, Adam Oellermann wrote: >>> >>>... >>>>As I understand it, the Power4 blows the doors off Itanium2 for integer >>>>performance. So a dual for approx $20000 and a quad for approx $30000 would >>>>represent an *immense* amount of chess for your money. Me, I'd love to see >>>>Crafty on one of these guys clean up ICC... Of course, while it's dreamtime, IBM >>>>have 32-way boxes with 1.4GHz Power4 CPUs >>>> >>>>Cheers >>>>Adam >>> >>>Bob, would you compare the speed of such computer and the one who run Cray >>>Blitz, please ? >> >> >>I don't know much about the power4 speeds yet. The Cray T932 is very fast, >>but it gets much of its speed from vector processing, which is something we >>spent a _lot_ of time on in Cray Blitz. Crafty on a T932 is not impressively >>fast although it is not slow. >> >>If the PPC4 is faster than itanium2, then it will be very fast indeed, since >>a 1Ghz I2 seems to run near 1.5M nodes per second for Crafty... > >A single processor PPC4 gets a spec2000 rating of 842 on crafty. Not bad ;) >http://www.spec.org/osg/cpu2000/results/res2002q2/cpu2000-20020422-01307.html You are wrong. That's not single-CPU Power4. That's multi-CPU Power4, with only one CPU running benchmarks. But that CPU uses L3 cache of *all* the CPUs. Web page you mentioned clearly says "128Mb of L3", so Crafty run out of the cache, not from memory. Take a look at http://commerce.www.ibm.com/content/home/shop_ShopIBM/en_US/eServer/pSeries/entry/6306C4.html, and notice how much L3 cache single- and dual-CPU systems have. Thanks, Eugene
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