[mpich-discuss] How to specify number of cores for each process

[Pavan Balaji]

As Zachary explained below, each process is in a different directory, so
he'll need to use an MPMD launch and can't do -n 16 directly.

 -- Pavan

On 11/27/2012 09:42 PM US Central Time, Jeff Hammond wrote:
> Did you try "mpiexec -n 16 ..."?
> 
> Sent from my iPhone
> 
> On Nov 27, 2012, at 10:37 PM, Zachary Stanko <zstanko at usgs.gov
> <mailto:zstanko at usgs.gov>> wrote:
> 
>> Hello,
>>
>> I am running an MPI program on a machine with two 16-core processors
>> yet, no matter what configuration I use with mpiexec, I am only
>> receiving 4 simultaneous processes.
>> I would like to maximize this machine's potential and run 8 or 16
>> processes. I have tried all of the channel selections and tried the
>> -binding option.
>> Since I need to specify a different working directory for each process
>> (due to many output files with naming conflicts), I have a config file
>> with 8 lines of the form:
>>
>> -n 1 -binding auto -dir <mydir01> <myprog> <inpfile>
>> -n 1 -binding auto -dir <mydir02> <myprog> <inpfile>
>> ...etc
>>
>> and I run:
>>
>> mpiexec -configfile <filename>
>>
>> Am I doing something wrong, or does MPICH just know best and cannot
>> run more than 4 jobs at a time on this system?
>>
>> Thanks,
>>
>> Zak
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji