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If your jobs use less than a full node please move to the serial partition which is available since the end of June on the Fidis cluster. In this partition you can easily be allocated less than a full node (a single CPU core for example).
There are currently ~45 60 nodes on the serial partition but the size will be adjusted based on the demand.
This table present the impact for some typical jobs:
| Job Type | Partition | Allocation Before | Allocation Now | Action required? |
|---|---|---|---|---|
| 1 node, 1 core | parallel | 1 core | 1 node  | Yes, move to serial partition. |
| 1 node, 14 cores | parallel | 1 core | 1 node | Yes, move to serial partition. |
| 1 node, 28 cores | parallel | 28 cores | 1 node  | No. |
| 2 nodes, 4 cores-per-node | parallel | 2 * 4 cores | 2 nodes | Maybe, evaluate if you really need the full resources of the node (memory, etc). |
| 2 nodes, 24 cores-per-node | parallel | 2 * 24 cores | 2 nodes | No. |
| 2 nodes, 18 cores-per-node | parallel | 2 * 28 cores | 2 nodes | No. |
Job Submit plugin (Fidis)
On Fidis single node jobs which use less than 75% of the cores of the node are now automatically redirected to the serial partition at submission time.
For example, on the table above, the two first jobs will automatically be moved to the serial partition at submission time (unless you explicitly request that the job has exclusive access to the node).
Questions?
Contact us via email: 1234@epfl.ch
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