Hi,
1. please, provide #cat /proc/cpu_info
2. see http://www.open-mpi.org/faq/?category=tuning#paffinity-defs.
Best regards
Lenny.
Terry Frankcombe wrote:
> Isn't it up to the OS scheduler what gets run where?
I was under the impression that the processor affinity API was designed
to let the OS (at least Linux) know how a given task preferred to be
bound in terms of the system topology.
--
V. Ram
v_r_...@fastmail.fm
--
Ralph Castain wrote:
> Thanks - yes, that helps. Can you do add --display-map to you cmd
> line? That will tell us what mpirun thinks it is doing.
The output from display map is below. Note that I've sanitized a few
items, but nothing relevant to this:
[granite:29685] Map for job: 1 Gener
Isn't it up to the OS scheduler what gets run where?
> We have an 8-way, 32-core AMD processor machine (single system image)
> and are at present running OpenMPI 1.2.8 . Jobs are launched locally on
> the machine itself. As far as I can see, there doesn't seem to be any
> way to tell OpenMPI to
Thanks - yes, that helps. Can you do add --display-map to you cmd
line? That will tell us what mpirun thinks it is doing.
Thanks
Ralph
On Dec 4, 2008, at 2:07 PM, V. Ram wrote:
Ralph H. Castain wrote:
I confess to confusion. OpenMPI will by default map your processes in
a round-robin fashi
Ralph H. Castain wrote:
> I confess to confusion. OpenMPI will by default map your processes in
> a round-robin fashion based on process slot. If you are in a resource
> managed environment (e.g., TM or SLURM), then the slots correspond to
> cores. If you are in an unmanaged environment, then your
I confess to confusion. OpenMPI will by default map your processes in
a round-robin fashion based on process slot. If you are in a resource
managed environment (e.g., TM or SLURM), then the slots correspond to
cores. If you are in an unmanaged environment, then your hostfile
needs to specif
We have an 8-way, 32-core AMD processor machine (single system image)
and are at present running OpenMPI 1.2.8 . Jobs are launched locally on
the machine itself. As far as I can see, there doesn't seem to be any
way to tell OpenMPI to launch the MPI processes on adjacent cores.
Presumably such f
