Author: Robert Hyatt
Date: 12:27:42 05/18/04
Go up one level in this thread
On May 18, 2004 at 15:02:08, Slater Wold wrote: >On May 17, 2004 at 23:32:20, Keith Evans wrote: > >>On May 17, 2004 at 14:42:16, Slater Wold wrote: >> >>>On May 17, 2004 at 14:28:57, Jason Kent wrote: >>> >>>>Does someone have a version compiled and optimized for P4 processors and >>>>hyperthreading? >>> >>>ftp://ftp.slate.gotdns.org/crafty/32/smp-sse2/c1913smpsse2.exe >> >>Slate, >> >>Doesn't hyperthreading slow Crafty down now? I thought that after some recent >>changes that were made for the Opteron NUMA system that Bob recommended against >>hyperthreading - no? >> >>-Keith > >No way it'd slow it down with a 1CPU HTing machine... It might. Two HT cpus are how much faster than one? Then we know that you will get about 1.7x to 1.8x of that speed. IE if SMT=on is 1.1x where SMT=off is 1.0X, then mt=2 is going to be a net loss, as you gain 10% with SMT on, and lose 15% of the total which is a net loss. That needs to be tested on a single CPU machine of course... It certainly hurts somewhat on my dual...
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