Isn't that changing the number of "cores". It seems --cpus-per-task can be up to 128, but I assume we should set it 28 since the task says it should use 28 cores. Then we can change the number of threads used with omp_set_num_threads while keeping cores the same? I'd assume that there would be no optimal value (U shape graph) for --cpus-per-task, but rather it would continually get faster the higher the number of cores that are used.