How can I see how busy the cluster is?

You can get the current status of all nodes on a cluster using the command sinfo, you will get a printout like the following. 

The nodelist column has been truncated for readability.

PARTITION AVAIL JOB_SIZE TIMELIMIT    CPUS S:C:T    NODES   STATE    NODELIST
large* up 1-infini 3-00:00:00 72 2:18:2 1 down* wbn128 large* up 1-infini 3-00:00:00 72 2:18:2 133 mixed wbn[009-020... large* up 1-infini 3-00:00:00 72 2:18:2 7 allocated wbn[031,038 large* up 1-infini 3-00:00:00 72 2:18:2 85 idle wbn[021,037... long up 1-infini 21-00:00:0 72 2:18:2 64 mixed wbn[009-020... long up 1-infini 21-00:00:0 72 2:18:2 5 allocated wbn[031,077... gpu up 1-infini 3-00:00:00 8 8:1:1 1 reserved vgpuwbg004 gpu up 1-infini 3-00:00:00 8 8:1:1 3 idle vgpuwbg[001-003] igpu up 1-infini 3-00:00:00 8 8:1:1 1 reserved vgpuwbg004 prepost up 1-infini 3:00:00 72 2:18:2 2 down* wbl[003,005] prepost up 1-infini 3:00:00 72 2:18:2 2 mixed wbl[002,010] prepost up 1-infini 3:00:00 72 2:18:2 5 allocated wbl[001,004... bigmem up 1-infini 7-00:00:00 72 2:18:2 1 down* wbl003 bigmem up 1-infini 7-00:00:00 72 2:18:2 2 mixed wbl[002,010] bigmem up 1-infini 7-00:00:00 72 2:18:2 5 allocated wbl[001,004... hugemem up 1-infini 7-00:00:00 128 4:16:2 1 mixed wbh001 ga_bigmem up 1-infini 21-00:00:0 72 2:18:2 1 down* wbl005 ga_hugeme up 1-infini 21-00:00:0 128 4:16:2 1 mixed wbh001

Each partition has a row for every state it's nodes are currently in.

For example, the large partition currently has  1 down node,  133 mixed nodes,  7 allocated nodes and  85 idle nodes.

The most common node states you are likely to see are:

idle All CPUs on this node are unallocated and available for use.
allocated All CPUs on this node are currently allocated.
mixed Some CPUs on this node are unallocated, smaller jobs are likely to land here.
down The node is unavailable for use
reserved This node has been reserved, and is only available for some users (in the case of the igpu partition, please contact NeSI support if you wish to use it).
draining Jobs are currently running on this node, but is not available for new jobs.

A full list of node states can be found here.

If you are interested in the state of one partition in particular you may want to use the command squeue -p <partition> to get the current queue of the partition <partition>

 

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