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