HP-MPI User's Guide (11th Edition)

Understanding HP-MPI

Running applications on HP-UX and Linux

Chapter 3 77

% $MPI_ROOT/bin/mpirun <mpirun options> -srun \

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.

For more details about using srun, refer to “Running applications on

HP-UX and Linux” on page 65.

HP-MPI also provides implied srun mode. The implied srun mode

allows the user to omit the -srun argument from the mpirun

command line with the use of the environment variable

MPI_USESRUN. For more information about the implied srun mode see

Appendix C, on page 285.

LSF on XC systems HP-MPI jobs can be submitted using LSF. LSF

uses the SLURM srun launching mechanism. Because of this, HP-MPI

jobs need to specify the -srun option whether LSF is used or srun is

used.

% bsub -I -n2 $MPI_ROOT/bin/mpirun -srun ./a.out

For more details on using LSF on XC systems, refer to “Running

applications on HP-UX and Linux” on page 65.

LSF on non-XC systems On non-XC systems, to invoke the Parallel

Application Manager (PAM) feature of LSF for applications where all

processes execute the same program on the same host:

% bsub <lsf_options> pam -mpi mpirun \

<mpirun_options> program <args>

For more details on using LSF on non-XC systems, refer to “Running

applications on HP-UX and Linux” on page 65.

Appfiles An appfile is a text file that contains process counts and a list

of programs. When you invoke mpirun with the name of the appfile,

mpirun parses the appfile to get information for the run.