# SLURM

Via Flight, SLURM schedules interactive and batch jobs. To test its functionality:

Run an interactive job:
```
srun --pty /bin/bash
```
If all was successful, the command prompt should have changed to the node running the interactive job. E.g.
```
[flight@chead1 (mycluster1) ~]$ srun --pty /bin/bash
[flight@cnode01 ~]$ 
```
Exit the interactive job with exit.

Run a batch job:

Create a file called job-test.sh with this inside:

#!/bin/bash -l
echo "Starting running on host $HOSTNAME"
sleep 12
echo "Finished running - goodbye from $HOSTNAME"

Run that job:
```
sbatch job-test.sh
```

Within 10 seconds of running the job, check to see if it is running:

squeue

If this functions, there should be a table of running jobs, one of which should be job-test.sh. E.g.

[flight@chead1 (mycluster1) ~]$ squeue
         JOBID PARTITION     NAME     USER ST       TIME  NODES NODELIST(REASON)
             4       all job-test   flight  R       0:01      1 cnode01

Wait for the job from step 2 to finish. Check the output file, which will be in the same directory that the job was run from. If successful it will look like this:
```
[flight@chead1 (mycluster1) ~]$ cat slurm-4.out
Starting running on host cnode01.pri.mycluster1.cluster.local
Finished running - goodbye from cnode01.pri.mycluster1.cluster.local
```
If the output file shows an error, then the job was not successful.
Run another job, and then cancel it:
```
scancel <job-ID>
```
If successful the job's output file should show that it was cancelled.

Check available nodes:

sinfo -Nl

If successful, all the nodes that are expected to be available will be shown. E.g.

[flight@chead1 (mycluster1) ~]$ sinfo -Nl
Wed Oct 12 14:29:07 2022
NODELIST   NODES PARTITION       STATE CPUS    S:C:T MEMORY TMP_DISK WEIGHT AVAIL_FE REASON              
cnode01        1      all*        idle 1       1:1:1      1        0      1   (null) none                

If all of the above steps have occured without issue, then SLURM is functioning.

# More Information

All information about Flight SLURM can be found in its documentation section.