HPC Grid Tutorial: How to Run an MPI Job

1. Log in to the Grid.
2. From your home directory, copy the MPI tutorial directory to your home directory by typing: cp -R /wsu/el7/scripts/tutorial/mpi_tutorial .
   
   
3. Go to the mpi_tutorial directory: cd mpi_tutorial
   
   Edit the job script by typing: vim mpi_python.sh
   
   
   Press i to begin editing, use the arrow keys to move up and down through the file. Change the email to your AccessID and the path to the mpi4.py script with your own.
   
   
   
   When finished, press Esc and :wq and Enter to save and quit
   
4. Run the MPI job script by typing: sbatch mpi_python.sh
   
   
   
   Check to see that your job is running by typing: qme
   
   
   
   This gives you the JOBID, the QOS the job is running on, the state of the job, the job name, how many nodes your job is running on, the number of cores, the memory requested, any features that will specified, the nodelist, and the reason if the job isn't running. You can login to any of the nodes that your job is running on by typing: ssh $HOSTNAME where $HOSTNAME is the name of the node your job is running on. When you are running an MPI Job you should ssh to the last node in the list and check to see if your job is running on it. You can check to see how many resources your job is using on the node by typing: top -u $USER where $USER is your AccessID. Hit q to quit top when you're done.

When your job is finished you should have an error and an output file in your directory.