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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