Queues and Reservations

Here are the queues available on Ruby. Please note that you will be routed to the appropriate queue based on your walltime and job size request.

Name Nodes available Max Walltime Max Job Size Notes


Available minus reservations

168 hours

1 node



Available minus reservations

96 hours

40 nodes




48 hours

1 node

32 core with 1 TB RAM

Use "-l nodes=1:ppn=32" to request it.


2 non-GPU nodes

2 GPU nodes (each with 2 GPUs)

1 hour 2 nodes

16 core with 128GB RAM

For small interactive and test jobs.

Use "-q debug" to request it.

"Available minus reservations" means all nodes in the cluster currently operational (this will fluctuate slightly), less the reservations. To access one of the restricted queues, please contact OSC Help. Generally, access will only be granted to these queues if performance of the job cannot be improved, and job size cannot be reduced by splitting or checkpointing the job.

Occasionally, reservations will be created for specific projects.

Approximately half of the Ruby nodes are a part of client condo reservations. Only jobs of short duration are eligible to run on these nodes, and only when they are not in use by the condo clients. As a result, your job(s) may have to wait for eligible resources to come available while it appears that much of the cluster is idle.