Ticket 12344 - information request: select multiple nodes from different groups
Summary: information request: select multiple nodes from different groups
Status: RESOLVED INFOGIVEN
Alias: None
Product: Slurm
Classification: Unclassified
Component: User Commands (show other tickets)
Version: 20.11.7
Hardware: Linux Linux
: 4 - Minor Issue
Assignee: Dominik Bartkiewicz
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Reported: 2021-08-24 08:18 MDT by Michael Hebenstreit
Modified: 2021-10-04 02:42 MDT (History)
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Description Michael Hebenstreit 2021-08-24 08:18:12 MDT 
imagine I have groups of nodes with different constraints

node1 constraint1
node2 constraint1
node3 constraint1
node4 constraint1
node5 constraint1

node6 constraint2
node7 constraint2
node8 constraint2
node9 constraint2
node0 constraint2

I want to get either 2 nodes from constraint1 or 2 nodes from constraint2 - but not any mixture of constraint1/constraint2. I tried:

$ srun --pty --exclusive  -N 2 -C "[constraint1*2|constraint2*2]" -t 20 -p adminq /bin/bash

but that lead to the error: 
srun: error: Unable to allocate resources: Requested node configuration is not available
Comment 1 Dominik Bartkiewicz 2021-08-25 03:40:06 MDT 
Hi

Same as in bug 12295, this is not a valid constraint expression, and such job should be rejected.

It would be best if you used "Matching OR" syntax eg.:
$ srun --pty --exclusive  -N 2 -C "[constraint1|constraint2]" -t 20 -p adminq /bin/bash

srun man:
...
              Matching OR
                     If  only  one  of a set of possible options should be used for all allocated
                     nodes, then use the OR operator and enclose the options within square brack‐
                     ets.  For example, --constraint="[rack1|rack2|rack3|rack4]" might be used to
                     specify that all nodes must be allocated on a single rack  of  the  cluster,
                     but any of those four racks can be used.

...

Dominik
Comment 2 Michael Hebenstreit 2021-08-25 08:45:26 MDT 
thanks, that seems to work, you can close the issue