Author: Robert Hyatt
Date: 21:01:44 03/17/03
Go up one level in this thread
On March 17, 2003 at 22:59:30, Aaron Gordon wrote: >On March 17, 2003 at 18:47:27, Eugene Nalimov wrote: > >>I just run the experiment. I used 2 otherwise identical 64-bit systems, one with >>3Mb of L3 cache, other with 1.5Mb. Machine with bigger cache run Crafty's >>"bench" comman 12% faster (1 CPU). >> >>That means that >>(1) Crafty's working set don't fit into 1.5Mb, >>(2) For systems with cache 1.5Mb or less (i.e. for almost all x86 systems) for >>Crafty memory speed matter. >> >>Thanks, >>Eugene > >Those types of systems aren't what people normally use. Most people here have a >Pentium 3, Athlon, Pentium 4, etc. Here is something I found with Crafty. > >Using the Nforce2 chipset I'm able to run the ram at speeds from 50% up to 200% >(100% being synchronous) of the fsb speed. I tested 200MHz FSB (400DDR) with >200MHz memory (400DDR) and 200fsb with 100MHz memory (200DDR). >The difference between ~1.6gb/s memory and ~3.2gb/s memory with craftys 'bench' >command was 0.14%. Yes, about one seventh of one percent. That might well suggest _another_ bottleneck in that particular machine....
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