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Slurm partitions

The Slurm partition setup of LUMI prioritizes jobs that aim to scale out. As a consequence most nodes are reserved for jobs that use all available resources within a node. However, some nodes are reserved for smaller allocations and debugging.

A list of the available partitions can be obtained using the sinfo command. To get a shorter summary, use sinfo -s.

Slurm partitions allocatable by node

The following partitions are available for allocation by node. When using these partitions, your jobs use all resources available on the node and won't share the node with other jobs. Therefore, make sure that your application can take advantage of all the resources on the node as you will be billed for the complete node regardless of the resource actually used as detailed in the billing policy.

Name Max walltime Max jobs Max resources/job Hardware partition used
standard 2 days 120 (100 running) 512 nodes LUMI-C
bench 1 day n/a All nodes LUMI-C

The bench partition is not available by default and is reserved for large-scale benchmark runs. Projects wishing to have access to this partition must send a request to the User Support Team.

Slurm partitions allocatable by resources

The following partitions are available for allocation by resources. This means that you can request a sub-node allocation: you can request only part of the resources (cores and memory) available on the compute node. This also means that your job may share the node with other jobs.

Name Max walltime Max jobs Max resources/job Hardware partition used
debug 30 minutes 1 (1 running) 4 nodes LUMI-C
small 3 days 220 (200 running) 4 nodes LUMI-C
largemem 1 day 30 (20 running) 1 nodes LUMI-D

LUMI-C/LUMI-D Large Memory Nodes

The LUMI-C large memory nodes (512GB and 1TB) are located in the small partition. Therefore, in order to use these nodes, you need to select the small partition (--partion=small). Then the LUMI-C large memory nodes will be allocated if you request more memory than is available in the LUMI-C standard compute nodes.

The nodes in the largemem partition are part of LUMI-D and have 4TB of memory per node.

Getting information about Slurm partitions

If you want more precise information about a particular partition, you can use the following command:

scontrol show partition <partition-name>

The output of this command will give you information about the defaults and limits which applies to the <partition-name> partition.