On Wednesday 24 May 2006 19:52, Joshua Baker-LePain wrote:
> Now, now, you can't tease like that. What do you mean by "proper numa
> settings", how do they correlate to BIOS settings, and how did you
> determine all that?
Sorry - I was in a hurry.
Depending on your version you either have numa enabled by default or you just
add a "numa=on" to your grub kernel parameters. If enabled or enabled depends
on the version - i.e. if you have dual core cpus 4.1 disables numa by default
and you need to enable it by hand.
Can't remember anything in the bios about it though... check with numactl
--hardware if you have numa support enabled.
The rest mostly depends on the applications you're running. Numactl is a much
underused utility. If you run just one process that takes up the majority of
memory/cpu then numactl will be for you. If each cpu has enough memory for
your processes, --localalloc can work very well - if you have a long running
process with many threads, --interleave can show better performance.
Bascially, once you have numa support enabled (if it is not already), try run
your apps with numactl and different options and see which ones perform
best :-)
Peter.
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