Test SLURM dispatch

Test compute node setup

You should now be able to submit SLURM jobs that run in Docker containers. On the node where you’re running the dispatcher, you can test this by running:

~$ sudo -u crunch srun -N1 docker run busybox echo OK

If it works, this command should print OK (it may also show some status messages from SLURM and/or Docker). If it does not print OK, double-check your compute node setup, and that the crunch user can submit SLURM jobs.

Test the dispatcher

On the dispatch node, start monitoring the crunch-dispatch-slurm logs:

~$ sudo journalctl -o cat -fu crunch-dispatch-slurm.service

On your shell server, submit a simple container request:

shell:~$ arv container_request create --container-request '{
  "name":            "test",
  "state":           "Committed",
  "priority":        1,
  "container_image": "arvados/jobs:latest",
  "command":         ["echo", "Hello, Crunch!"],
  "output_path":     "/out",
  "mounts": {
    "/out": {
      "kind":        "tmp",
      "capacity":    1000
  "runtime_constraints": {
    "vcpus": 1,
    "ram": 8388608

This command should return a record with a container_uuid field. Once crunch-dispatch-slurm polls the API server for new containers to run, you should see it dispatch that same container. It will log messages like:

2016/08/05 13:52:54 Monitoring container zzzzz-dz642-hdp2vpu9nq14tx0 started
2016/08/05 13:53:04 About to submit queued container zzzzz-dz642-hdp2vpu9nq14tx0
2016/08/05 13:53:04 sbatch succeeded: Submitted batch job 8102

If you do not see crunch-dispatch-slurm try to dispatch the container, double-check that it is running and that the API hostname and token in /etc/arvados/crunch-dispatch-slurm/crunch-dispatch-slurm.yml are correct.

Before the container finishes, SLURM’s squeue command will show the new job in the list of queued and running jobs. For example, you might see:

~$ squeue --long
Fri Aug  5 13:57:50 2016
   8103   compute zzzzz-dz   crunch  RUNNING       1:56 UNLIMITED      1 compute0

The job’s name corresponds to the container’s UUID. You can get more information about it by running, e.g., scontrol show job Name=UUID.

When the container finishes, the dispatcher will log that, with the final result:

2016/08/05 13:53:14 Container zzzzz-dz642-hdp2vpu9nq14tx0 now in state "Complete" with locked_by_uuid ""
2016/08/05 13:53:14 Monitoring container zzzzz-dz642-hdp2vpu9nq14tx0 finished

After the container finishes, you can get the container record by UUID from a shell server to see its results:

shell:~$ arv get zzzzz-dz642-hdp2vpu9nq14tx0

You can use standard Keep tools to view the container’s output and logs from their corresponding fields. For example, to see the logs from the collection referenced in the log field:

~$ arv keep ls a01df2f7e5bc1c2ad59c60a837e90dc6+166
~$ arv keep get a01df2f7e5bc1c2ad59c60a837e90dc6+166/stdout.txt
2016-08-05T13:53:06.201011Z Hello, Crunch!

If the container does not dispatch successfully, refer to the crunch-dispatch-slurm logs for information about why it failed.

Previous: Install the SLURM dispatcher Next: Install Node Manager

The content of this documentation is licensed under the Creative Commons Attribution-Share Alike 3.0 United States licence.
Code samples in this documentation are licensed under the Apache License, Version 2.0.