[bf1942] 64bit linux BF2 performance stats

James Gurney james at globalmegacorp.org
Wed Jul 20 20:43:49 EDT 2005

On 7/20/2005 5:18 PM, Steven Hartland wrote:
> I dont think the linux scheduler is really NUMA aware.

 From a quick Google, the NUMA scheduler code was merged in 2.6.7 (see 
http://kerneltrap.org/node/3178 ), so I'm pretty sure it's NUMA aware 
past that. The kernel config certainly has an option for it. How 
advanced it is and how much benefit it gives is up for speculation.

On 7/20/2005 4:56 PM, Andreas Fredriksson wrote:
 > If anyone has a spare NUMA system and feels up to the task I could
 > help with looking at the results. I think the pids of the threads can
 > be gathered from strace, but I'm not familiar with the userland tools
 > to change the affinity (and I also don't have an Opteron sitting
 > around).

I dunno about spare, but we have a dual opteron gentoo box where I can 
run tests. The version of ps lists the pids for all the threads, and 
changing the affinity is done on a per-pid level, so it should be easy 
enough. The hardest part would be setting up a consistant test case to 
compare. If you want to email me off list I can set you up with ssh 
access to the box and we can do some experimenting.


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