There are two problems in your usage below. 1. I'm guessing that your host file specifies only one core for each host. Something like: host1 host2 Did you look through the mpiexec usage document that tells you how to specify multiple cores on each host? http://wiki.mpich.org/mpich/index.php/Using_the_Hydra_Process_Manager You should do something like: host1:16 host2:16 (please read the documentation on the above link for more information). 2. There's option called -binding auto. Did you mean -binding none? -- Pavan On 11/27/2012 09:37 PM US Central Time, Zachary Stanko 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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