I don't think you can specify it. I believe slurm makes use of external library to recognize the cores topology. To check if this is a bug or designed behaviur, you can check: --hint=nomultithread option to srun
cheers, Marcin 2017-02-09 8:21 GMT+01:00 Ulf Markwardt <ulf.markwa...@tu-dresden.de>: > Dear all, > > where can I tell Slurm what core numbers belong to the same physical core? > > The physical cores on our KNL are 0-63, followed by hyperthreads 64-255. > cat /sys/devices/system/cpu/cpu0/topology/thread_siblings_list > 0,64,128,192 > > When I ask for 4 cores with "srun --pty -c 4 -p knl bash" I see: > taurusknl1 /home/mark taskset -pc $$ > pid 285662's current affinity list: 0,64,128,192 > but these are not 4 cores but only one core! > > It looks like Slurm does not recognize the numbering scheme for the > cores on the node. Where can I specify this? > > > Thank you, > Ulf > > "scontrol show node " says: > CoreSpecCount=1 CPUSpecList=252-255 > this, again, are 4 threads on 4 different cores! > > This is my node entry for this guy: > NodeName=taurusknl[1] Sockets=1 CoresPerSocket=64 ThreadsPerCore=4 > State=UNKNOWN RealMemory=94000 Weight=64 CoreSpecCount=1 > > > -- > ___________________________________________________________________ > Dr. Ulf Markwardt > > Technische Universität Dresden > Center for Information Services and High Performance Computing (ZIH) > 01062 Dresden, Germany > > Phone: (+49) 351/463-33640 WWW: http://www.tu-dresden.de/zih > >
