[slurm-users] Re: Performance Discrepancy between Slurm and Direct mpirun for VASP Jobs.

Ole Holm Nielsen via slurm-users slurm-users@lists.schedmd.com writes:

Whether or not to enable Hyper-Threading (HT) on your compute nodes depends entirely on the properties of applications that you wish to run on the nodes. Some applications are faster without HT, others are faster with HT. When HT is enabled, the "virtual CPU cores" obviously will have only half the memory available per core.

Another consideration is, if you keep HT enabled, do you want Slurm to hand out physical cores to jobs, or logical cpus (hyperthreads)? Again, what is best depends on your workload. On our systems, we tend to either turn off HT, or hand our cores.