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 the scontrol 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
   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 to your nodes argument of Slurm.

$ sbatch --constraint=<FEATURE>

And it can also be used in your job scripts:
#SBATCH --constraint=<FEATURE>
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