Generate a CPU Mask list usable by MPI-based jobs run with Slurm's srun, or
mpirun from any of the MPI libraries (e.g., mpich,
openMPI).
numa_mask_gen can either poll the node (using lscpu)
or with user supplied values using the --sockets, --cores-per-socket, and
--numa-nodes command line options, where --sockets is the number of sockets on
the node, --cores-per-socket are the number of physical cores per CPU, and
--numa-nodes are the number of NUMA zones per node.
If using a hybrid MPI+openMP executable, supply the number of threads using the
--threads option.
By default, numa_mask_gen will attempt to use the hyperthreaded (virtual) cores. The assumption is the hyperthreaded cores are numbered n through n*2-1 where n is the number of physical cores per node.
numa_mask_gen will print the hex prepresentation of the mask, unless both
--no-hyperthreads and --cpu-list options are given. Note, a digital list
of CPUs is not possible when using hyperthreads.