Author: Robert Hyatt
Date: 14:55:35 02/18/05
Go up one level in this thread
On February 18, 2005 at 12:43:20, Eugene Nalimov wrote: >On February 18, 2005 at 11:26:26, Mike Byrne wrote: > >>On February 18, 2005 at 05:13:02, Peter Skinner wrote: >> >>>On February 18, 2005 at 04:09:47, Mike Byrne wrote: >>> >>>>That does work with VS 2005 - thanks Joshua and Eugene . >>>> >>>>Also, PGO really helps a lot with VS 2005. Increases Crafty NPS by 33% on the >>>>dual Opteron. Crafty was about 3M nps, and with PGO and 10% OC, it goes up to >>>>4M nps. >>> >>>Hi Mike, >>> >>>Reading through the helpfile there is no mention of PGO compiles with 2005... >>> >>>Or well atleast the downloadable version. >>> >>>Peter >> >>On the CD "pro" version (not the express), the help talks about profiling, the >>option are different than Intel's PGO option \GL etc. (MS calls it POGO I >>believe) >> >>The "free" CD also has the AMD64 specific processor options, for $9.95 shipping, >>it is well worth it even if it is a beta. >> >>Also, CD is in DVD format and count on 4 gigs for the install. It takes an hour >>to load on 1.8 Opteron. > >2 remarks: > >(1) You mentioned /GL -- that is link-time code genration, not POGO. Did you >really compiled with POGO, e.g. built instrumented version, trained it, and then >built optimized one? > >(2) Output that you provided says "System is SMP, not NUMA". When I start Carfty >of Windows Server on AMD64 it correctly recognizes it as NUMA. I am not sure who >is guilty here -- Windows XP or BIOS settings. If later than there should be a >way to turn NUMA support on. > >Thanks, >Eugene Many of the AMD opteron boxes I have used have a BIOS setting for SMP or NUMA. Not that it really changes things except for how memory is mapped from a processor to local memory. I believe that a quad in SMP mode will result in physical RAM pages 0-3 being on different local memory controllers. That is I think it interleaves pages across all nodes uniformly. the NUMA setting does the opposite and the first 1/4 of physical RAM goes on processor 0, the next 1/4 on processor 1, etc... I tried both ways at AMD when I was using their hardware, to see how each would affect things. "NUMA" mode was better for Crafty...
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.