Hello, Most jobs of my users are single-thread. I have multithreaded processors. The jobs seem to reserve 2 logical CPU (1 core=2 CPU (2 threads)) whereas it only uses 1 logical CPU(1 thread). Nevertheless, my slurm.conf file indicates:
[...] SelectType = select / cons_res SelectTypeParameters = CR_CPU FastSchedule = 1 [...] NodeName = DEFAULT Boards = 1 SocketsPerBoard = 2 CoresPerSocket = 18 ThreadsPerCore = 2 RealMemory = 128000 And here is an excerpt from the output of a job running on this type of node: $ scontrol show job idjob [...] NumNodes=1 NumCPUs=1 NumTasks=1 CPUs/Task=1 ReqB:S:C:T=0:0:*:* TRES=cpu=1,mem=200M,node=1,billing=1 Socks/Node=* NtasksPerN:B:S:C=0:0:*:* CoreSpec=* MinCPUsNode=1 MinMemoryCPU=200M MinTmpDiskNode=0 Features=(null) DelayBoot=00:00:00 OverSubscribe=OK Contiguous=0 Licenses=(null) Network=(null) But with [ https://github.com/OleHolmNielsen/Slurm_tools/tree/master/pestat | pestat ] , I can see my node use 72/72 CPU but have only 36 job running like this one. How should I do so that jobs are allocated to the thread and not to the core ? Best regards. Jean-Mathieu