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--- slurm [2022/09/27 13:54]
vodrazka [Batch mode]
+++ slurm [2022/10/03 13:38]
vodrazka [Cluster info]
@@ Line 113: / Line 113: @@
 </code>
+=== CPU core allocation ===
+The minimal computing resource in SLURM is one CPU core. However, CPU count advertised by SLURM corresponds to the number of CPU threads.
+If you ask for 1 CPU core with <code>--cpus-per-task=1</code> SLURM will allocate all threads of 1 CPU core.
+For example ''dll-8gpu1'' will allocate 2 threads since its ThreadsPerCore=2:
+<code>
+$> scontrol show node dll-8gpu1
+$ scontrol show node dll-8gpu1
+NodeName=dll-8gpu1 Arch=x86_64 CoresPerSocket=16
+   CPUAlloc=0 CPUTot=64 CPULoad=0.05                                               // CPUAlloc - allocated threads, CPUTot - total threads
+   AvailableFeatures=gpuram24G
+   ActiveFeatures=gpuram24G
+   Gres=gpu:nvidia_a30:8(S:0-1)
+   NodeAddr=10.10.24.63 NodeHostName=dll-8gpu1 Version=21.08.8-2
+   OS=Linux 5.15.35-1-pve #1 SMP PVE 5.15.35-3 (Wed, 11 May 2022 07:57:51 +0200)
+   RealMemory=515838 AllocMem=0 FreeMem=507650 Sockets=2 Boards=1
+   CoreSpecCount=1 CPUSpecList=62-63                                               // CoreSpecCount - cores reserved for OS, CPUSpecList - list of threads reserved for system
+   State=IDLE ThreadsPerCore=2 TmpDisk=0 Weight=1 Owner=N/A MCS_label=N/A          // ThreadsPerCore - count of threads for 1 CPU core
+   Partitions=gpu-ms
+   BootTime=2022-09-01T14:07:50 SlurmdStartTime=2022-09-02T13:54:05
+   LastBusyTime=2022-10-02T20:17:09
+   CfgTRES=cpu=64,mem=515838M,billing=64
+   AllocTRES=
+   CapWatts=n/a
+   CurrentWatts=0 AveWatts=0
+   ExtSensorsJoules=n/s ExtSensorsWatts=0 ExtSensorsTemp=n/s
+</code>
+In the example above you can see comments at all lines relevant to CPU allocation.

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