Limiting Resource Requests for CESM 2.1.5 Jobs

[krivers]

Hi all,

I've successfully ported CESM 2.1.5 to the Compute Canada machines and have been able to run a few simulations. However, I've noticed that the jobs request a large number of resources by default (e.g., 288 cores in 6 nodes).

Is there a way to limit the maximum number of nodes or cores that each job (e.g., via ./case.submit) uses? Specifically, I’m looking to reduce the computational footprint and manage queue times more effectively.

Can these constraints be set through CESM configuration parameters, or should they be defined directly in the batch submission script (e.g., walltime, node/core count)? Any guidance on how to control resource usage within CESM or through the batch system would be greatly appreciated.


Thanks!


What version of the code are you using?
------------------------------------------------------------------------
git describe:
release-cesm2.1.5-0-g7a6c5b0
------------------------------------------------------------------------
release-clm5.0.37


Have you made any changes to files in the source tree?
- Ported the code to Compute Canada machines using Downloading CESM2 (CESM2.1) — CESM CESM2.1 documentation

 

[oleson]

You can adjust nodes/cores through env_mach_pes.xml. See this section in the cime guide:

5. Controlling processors and threads — CIME cime5.6 documentation

 

[krivers]

Thank you very much