stackSentinel.py Parallel Processing Options

[phillip-lee-choi]

Hi, stackSentinel.py has the following for parallel processing options:

compute.add_argument('--num_proc', '--num_process', dest='numProcess', type=int, default=1, help='number of tasks running in parallel in each run file (default: %(default)s).')

Can I get some more insight into using this argument with slurm? For instance, if I want to run a job with ntasks=8, then I assume I should add --num_proc=8 as a flag; does --num_proc have to match the exact number of ntasks, or can it be a multiple?

Additionally, what about multithreading? If I use ntasks=4, cpus-per-task=2, then the total number of cores is 8. Should num_process still be 4 to match the number of tasks, or 8 to match the number of cores?

Thanks very much in advance!