HP XC System 3.x Software User Manual

Page 98

You can simplify this by first setting the SLURM_JOBID environment variable to the SLURM JOBID in the
environment, as follows:

$ export SLURM_JOBID=150

$ srun hostname

Note:

Be sure to unset the SLURM_JOBID when you are finished with the allocation, to prevent a previous
SLURM JOBID from interfering with future jobs:

$ unset SLURM_JOBID

The following examples illustrate launching interactive MPI jobs. They use the hellompi job script
introduced in

Example 10-7 Launching an Interactive MPI Job

$ mpirun -srun --jobid=150 hellompi

Hello! I'm rank 0 of 4 on n1

Hello! I'm rank 1 of 4 on n2

Hello! I'm rank 2 of 4 on n3

Hello! I'm rank 3 of 4 on n4

uses the -n 8 option to launch on all cores in the allocation.

Example 10-8 Launching an Interactive MPI Job on All Cores in the Allocation

This example assumes 2 cores per node.

$ mpirun -srun --jobid=150 -n8 hellompi

Hello! I'm rank 0 of 8 on n1

Hello! I'm rank 1 of 8 on n1

Hello! I'm rank 2 of 8 on n2

Hello! I'm rank 3 of 8 on n2

Hello! I'm rank 4 of 8 on n3

Hello! I'm rank 5 of 8 on n3

Hello! I'm rank 6 of 8 on n4

Hello! I'm rank 7 of 8 on n4

Alternatively, you can use the following:

$ export SLURM_JOBID=150

$ export SLURM_NPROCS=8

$ mpirun -srun hellompi