[Developers] Add OpenMP statistics to PUGH

Frank Loeffler knarf at cct.lsu.edu
Fri Oct 23 09:43:04 CDT 2009


Hi,

On Fri, Oct 23, 2009 at 07:39:56AM -0700, John Shalf wrote:
> it is a very bad thing of processes migrate due to NUMA effects.
> Data gets pinned to the memory controller that is closest to the
> processor that first touched it.  Things get very inefficient if the
> process migrates to a distant processor.

Yes, but you do not always have different memory controllers attached to
different cores.

> You might also take a look at JumpShot (inside of MPE) to see how
> they do their instrumentation.
> ftp://ftp.mcs.anl.gov/pub/mpi/mpe/mpe2-1.1.1.tar.gz
> It works on BlueGene as well, and profiles any OpenMP implementation
> that is built on top of pthreads (as most of them are).

thanks for the that pointer.

Frank

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