CSC Getting Started Guide

Production Computing

Publication Acknowledgements

Please remember to acknowledge the CSC’s grant and institutional sponsors in your publications. A list of current sponsors is available in the file /home/public/acknowledgement.txt.

Cluster Reservations

If you need a large quantity of computational resources for a project or publication, you may request a cluster reservation. We grant both exclusive and non-exclusive cluster reservations. Exclusive reservations are very uncommon and require a substantial amount of administrator intervention. Non-exclusive reservations are easier to implement and more common.

An exclusive reservation gives a user dedicated access to the entire cluster for a short period of time. For example, some users occasionally need to debug whole-cluster jobs interactively. With an exclusive reservation, we drain all of the queues for a specified reservation start time. When the cluster is free, the reserving user is given exclusive access to the entire system for a short duration, usually from 9:00 PM until 9:00 AM. In the morning, the cluster is returned to general purpose computing. Depending on the cluster load, exclusive reservations usually require at least 10 days advance notice.

Non-exclusive reservations are much more common and allow users with large production computing projects, such as for a paper deadline, to run more jobs than would normally be allowed by the queuing system. With a non-exclusive reservation, the reserving user is given access to a special high-priority queue called reservedq that runs more jobs than the other queues. While a non-exclusive reservation does not guarantee immediate access, reservedq jobs are run before any other jobs on the system. This provides additional computing capacity for a short period of time.

To request a queue reservation, please contact Henry Tufo directly at least 10 days prior to the desired reservation start time. Exclusive reservations should be scheduled as far in advance as possible. Note that during high load times of the year – such as before popular conferences and finals week – the clusters will be oversubscribed and reservations cannot be granted or fulfilled.

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