I use the RealMemory parameter and have never quite understood the difference. Docs seem to indicate that either can achieve the effect of leaving memory reserved for the OS. 

Jason

Jason L. Simms, Ph.D., M.P.H.
Research Computing Manager
Swarthmore College
Information Technology Services
(610) 328-8102


On Thu, Jul 17, 2025 at 7:08 AM Sean Maxwell via slurm-users <slurm-users@lists.schedmd.com> wrote:
Are you looking for MemSpecLimit?
https://slurm.schedmd.com/slurm.conf.html#OPT_MemSpecLimit
"Amount of RealMemory, in megabytes, reserved for system use and not available for user allocations...."

-Sean

On Thu, Jul 17, 2025 at 5:31 AM John Hearns via slurm-users <slurm-users@lists.schedmd.com> wrote:
Someone remind me please what is the SLurm node parameter to reserve an amount of memory for the OS?

Thanks

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