Selecting Nodes Classes
Node Features
Nodes can be selected by adding requirements to your job scripts. Such requirements might be a number of processors per node or memory requirement. For example, if you require 25 processors or more than your job cannot be scheduled on a node with 24 processors. Another way to select nodes is to use features. Use thescontrol show nodes command to view detailed information about nodes.
Most interesting is the features string.
$ scontrol show nodes NodeName=cmp035 Arch=x86_64 CoresPerSocket=4 CPUAlloc=0 CPUErr=0 CPUTot=8 CPULoad=0.01 Features=Infiniband,Intel,E5472 Gres=(null) NodeAddr=cmp035 NodeHostName=cmp035 OS=Linux RealMemory=64000 AllocMem=0 Sockets=2 Boards=1 State=IDLE ThreadsPerCore=1 TmpDisk=0 Weight=1 BootTime=2014-06-17T16:59:12 SlurmdStartTime=2014-06-17T16:59:52 CurrentWatts=0 LowestJoules=0 ConsumedJoules=0 ExtSensorsJoules=n/s ExtSensorsWatts=0 ExtSensorsTemp=n/s
Selecting Nodes with a certain feature
To make your processes run only on the Nodes with certain features, append$ sbatch --constraint=<FEATURE> job.shAnd it can also be used in your job scripts:
#!/bin/bash ... #SBATCH --constraint=<FEATURE> ....
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