So, it appears that for a machine of this type (dual quad core cpu's),
this approach would be correct for my tests...
[jpummill@n1 bin]$ more my-hosts
n1 slots=8 max_slots=8
and subsequently, launch two jobs in this configuration...
/home/jpummill/openmpi-1.2.2/bin/mpirun --hostfile my-hosts -np 4
--byslot ./cg.C.4
It appears that this does avoid oversubscribing any particular core as I
am not exceeding my core count by running just the two jobs requiring 4
cores each.
Thanks,
Jeff Pummill
George Bosilca wrote:
The cleaner way to define such an environment is by using the
max-slots and/or slots options in the hostfile. Here is a FAQ entry
about how Open MPI deal with these options
(http://www.open-mpi.org/faq/?category=running#mpirun-scheduling).
george.
On Oct 26, 2007, at 10:52 AM, 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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