Download Platform MPI User's Guide - Platform Cluster Manager

Understanding Platform MPI
For example:
% $MPI_ROOT/bin/mpirun -f my_appfile
runs using an appfile named my_appfile, that might have contents such as:
-h hostA -np 2 /path/to/a.out
-h hostB -np 2 /path/to/a.out
which specify that two ranks are to run on host A and two on host B.
prun execution
•
Use the -prun option for applications that run on the Quadrics Elan interconnect. When using the prun option, mpirun sets environment variables and invokes prun utilities.
The -prun argument to mpirun specifies that the prun command is to be used for launching. All
arguments following -prun are passed unmodified to the prun command.
% $MPI_ROOT/bin/mpirun <mpirun options> -prun <prun options>
The -np option is not allowed with prun. Some features like mpirun -stdio processing are
unavailable.
% $MPI_ROOT/bin/mpirun -prun -n 2 ./a.out
launches a.out on two processors.
% $MPI_ROOT/bin/mpirun -prot -prun -n 6 -N 6 ./a.out
turns on the print protocol option (-prot is an mpirun option, and therefore is listed before -prun)
and runs on 6 machines, one CPU per node.
Platform MPI also provides implied prun mode. The implied prun mode allows the user to omit the
-prun argument from the mpirun command line with the use of the environment variable
MPI_USEPRUN.
srun execution
•
Applications that run on HP XC clusters require the -srun option. start-up directly from srun is not
supported. When using this option, mpirun sets environment variables and invokes srun utilities.
The -srun argument to mpirun specifies that the srun command is to be used for launching. All
arguments following -srun are passed unmodified to the srun command.
% $MPI_ROOT/bin/mpirun <mpirun options> -srun <srun options>
The -np option is not allowed with srun. Some features like mpirun -stdio processing are
unavailable.
% $MPI_ROOT/bin/mpirun -srun -n 2 ./a.out
launches a.out on two processors.
% $MPI_ROOT/bin/mpirun -prot -srun -n 6 -N 6 ./a.out
turns on the print protocol option (-prot is an mpirun option, and therefore is listed before -srun)
and runs on 6 machines, one CPU per node.
74 Platform MPI User's Guide