Author: Eugene Nalimov
Date: 14:52:58 08/20/04
Go up one level in this thread
On August 20, 2004 at 04:33:07, Tom Kerrigan wrote: >Now that AMD is selling two processors that are identical other than L2 cache >size (Sempron has 256k, Athlon 64 has 512k) we have proof of Crafty's working >set size: > >Sempron: 1,080,020 NPS >Athlon 64: 1,080,230 NPS > >http://www.anandtech.com/linux/showdoc.aspx?i=2170&p=3 > >This should prove once and for all that Crafty's working set is < 256k and >therefore that size of L2 cache has no effect on its performance (as long as >it's >= 256k) and that main memory speed likely plays a trivial role >performance-wise. > >I bring this up because of all of the long debates that have occurred in the >past about the value of L2 cache, the speed of memory, and the working set size >of chess programs. If you remember, several years ago I run the similar experiment. I benchmarked Crafty on 900MHz Itanium2 with 1.5Mb of L2 cache, and on 900MHz Itanium2 with 3Mb of L2 cache. I don't remember exact numbers (I posted them here), but the 3Mb cache was faster by (I believe) 10%. Unfortunately that did not answer original question, as CPUs have not only different cache size, but also different cache associativity. 1.5Mb was 6-way associative. 3Mb was 12-way associative. Thanks, Eugene >I have no doubt that Crafty uses a bunch of memory, but obviously not with >enough temporal locality for it to matter one iota. > >-Tom
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.