Re: [atlas-devel] tuning of Atlas on x86/NUMA

[dean g. <de...@ar...>]

On Wed, 25 Jun 2008, Mikhail Kuzminsky wrote:

> I have dual socket quad-core Opteron 2350/2 Ghz - based server.
> 
> 1) For single-threaded Atlas
> 
> For the current 3.8.2 I may use taskset or/and numactl utilities to 
> force processor affinity (and NUMA memory allocation) at the tuning 
> phase.
> 
> What should I use to be correct ?
> 
> I may use taskset/numactl simple for issuiing of the corresponding 
> makes.
> Is it necessary to use
> 
> taskset -c <CPU_number> make build

the default memory policy is a local node allocation (assuming there are 
free pages)... so it may not make any difference.  but yeah for 
consistency in the timing it's probably best to use something like:

numactl --membind=0 --cpubind=0 make build

-dean