# 9.8. Launching with LSF

PRRTE supports the LSF resource manager.

## 9.8.1. Verify LSF support

The `prte_info` command can be used to determine whether or not an installed Open MPI includes LSF support:

    shell$ prte_info | grep lsf

If the PRRTE installation includes support for LSF, you should see a line similar to that below. Note the MCA version information varies depending on which version of PRRTE is installed.

    MCA ras: lsf (MCA v2.1.0, API v2.0.0, Component v3.0.0)

## 9.8.2. Launching

When properly configured, PRRTE obtains both the list of hosts and how many processes to start on each host from LSF directly. Hence, it is unnecessary to specify the `--hostfile`, `--host`, or `-n` options to `mpirun`. PRRTE will use LSF-native mechanisms to launch and kill processes (`ssh` is not required).

For example:

    # Allocate a job using 4 nodes with 2 processors per node and run the job on the nodes allocated by LSF
    shell$ bsub -n 8 -R "span[ptile=2]" "prterun mpi-hello-world"

This will run the processes on the nodes that were allocated by LSF. Or, if submitting a script:

    shell$ cat my_script.sh
    #!/bin/sh
    prterun mpi-hello-world
    shell$ bsub -n 8 -R "span[ptile=2]" < my_script.sh