Had same problem in slurm 15, not sure if it affects newer versions. Don’t use the expanded node definition
NodeName = DEFAULT Boards = 1 SocketsPerBoard = 2 CoresPerSocket = 18 ThreadsPerCore = 2 RealMemory = 128000 Use the simpler NodeName=DEFAULT Cores=36 RealMemory = 128000 Slurm will use both logical threads and not just the physical. Doug “To err is human – and to blame it on a computer is even more so.” Robert Orben From: slurm-users <slurm-users-boun...@lists.schedmd.com> On Behalf Of Benjamin Redling Sent: Thursday, May 2, 2019 3:49 AM To: Slurm User Community List <slurm-users@lists.schedmd.com> Subject: [External] Re: [slurm-users] How should I do so that jobs are allocated to the thread and not to the core ? Have you Seen the slurm FAQ? You may want to search on that site for "Hyperthreading" (Sorry for the TOFU. vacation, mobile) Am 30. April 2019 18:07:03 MESZ schrieb Jean-mathieu CHANTREIN <jean-mathieu.chantr...@univ-angers.fr<mailto:jean-mathieu.chantr...@univ-angers.fr>>: 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 pestat <https://github.com/OleHolmNielsen/Slurm_tools/tree/master/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 -- Diese Nachricht wurde von meinem Android-Gerät mit K-9 Mail gesendet.
