HP XC System 2.x Software - Manual (Page 37)

Example 2-5: Running an MPI Job with LSF Using the External Scheduler Option
(cont.)
Hello world! I’m 2 of 4 on host2
Hello world! I’m 3 of 4 on host3
Hello world! I’m 4 of 4 on host4
2.3.5.4 Submitting a Batch Job or Job Script
Submitting batch jobs is discussed in detail in Section 7.4.6. The bsub command format to
submit a batch job or job script is:
bsub -n num-procs [bsub-options] script-name
The -n num-procs option specifies the number of processors the job requests. The -n
num-procs is required for parallel jobs.
The script-name argument is the name of the batch job or script. The script can contain
one or more srun or mpirun commands.
The script will execute once on the first allocated node, and the srun or mpirun commands
within the script will be run on the allocated compute nodes.
Consider an HP XC configuration where lsfhost.localdomain is the LSF execution host
and nodes n[1-10] are compute nodes in the LSF partition. All nodes contain 2 processors,
providing 20 processors for use by LSF jobs.
In this example, the following simple script myjobscript.sh is launched. Two srun
commands are specified within the script.
Example 2-6: Submitting a Job Script
#!/bin/sh
srun hostname
mpirun -srun hellompi
The following command submits this script:
$ bsub -I -n4 myjobscript.sh
The -n4 option specifies that four processors are required. The -I option specifies that the job
is interactive and directs output to the terminal screen. The following output is displayed:
Job <29> is submitted to default queue <normal>.
<<Waiting for dispatch ...>>
<<Starting on lsfhost.localdomain>>
n2
n2
n4
n4
Hello world! I’m 0 of 4 on n2
Hello world! I’m 1 of 4 on n2
Hello world! I’m 2 of 4 on n4
Hello world! I’m 3 of 4 on n4
Using the System 2-11