MPICH-p4 alternative to -nolocal flag

Question

Is there an alternative for the -nolocal option when I run an MPI program using mpiexec of MPICH-p4?

Answer 1

If all you want to do is run all of your processes locally, don't provide a hostfile (or provide one that only includes localhost). Keep in mind that you're severely limiting how much parallelization you can do to essentially the number of cores you have. After that, you start to oversubscribe them and you can run out of resources quickly.