Also see:
http://www.open-mpi.org/faq/?category=tuning#paffinity-defs
http://www.open-mpi.org/faq/?category=tuning#using-paffinity
and
http://www.open-mpi.org/projects/plpa/
On Oct 31, 2007, at 11:55 AM, ky...@neuralbs.com wrote:
It will indeed but you can have better control over the processor
assignment by using processor affinity (also get better
performance) as
sen here:
http://www.nic.uoregon.edu/tau-wiki/Guide:Opteron_NUMA_Analysis
http://www-128.ibm.com/developerworks/linux/library/l-affinity.html
Eric
I think if you boot the mpi on the host machine, and than run your
program with 8 thread (mpirun -np 8 <program_name>) , the operating
system will automatically distribute it to the cores.
Jeff Pummill wrote:
I am doing some testing on a variety of 8-core nodes in which I just
want to execute a couple of executables and have them distributed to
the available cores without overlapping. Typically, this would be
done
with a parameter like /-machinefile machines/, but I have no idea
what
names to put into the /machines/ file as this is a single node with
two quad core cpu's. As I am launching the jobs sans scheduler, I
need
to specify what cores to run on I would think to keep from
overscheduling some cores while others receive nothing to do at all.
Simple suggestions? Maybe Open MPI takes care of this detail for me?
Thanks!
Jeff Pummill
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Jeff Squyres
Cisco Systems
