[slurm-users] Small FreeMem is reported by scontrol

Mahmood Naderan mahmood.nt at gmail.com
Mon Dec 16 16:25:43 UTC 2019

>Memory may be being used by jobs running, or tasks outside the control of
>Slurm running, or possibly NFS buffer cache or similar.  You may need to
>start an ssh session on the node and look.

I checked that. For example, on compute-0-1, I see
    RealMemory=120705 AllocMem=1024 FreeMem=8442 Sockets=32 Boards=1

I then connected to the node and ran "top"

    KiB Mem : 12360248+total,  8623376 free,  5197452 used,

I then ran

    sync; echo 3 > /proc/sys/vm/drop_caches

While "top" shows the caches are deleted

    KiB Mem : 12360248+total, 11805062+free,  5202876 used,   348992

Still scontrol shows the same as before

   RealMemory=120705 AllocMem=1024 FreeMem=8426 Sockets=32 Boards=1

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