code: def set_mpi_procs(self, mpi_procs):
          
          QueueAdapter.set_mpi_procs(self, mpi_procs)
  
          num_nodes, rest_cores = self.hw.divmod_node(mpi_procs, omp_threads=1)
          if num_nodes == 0:
              self.qparams["nodes"] = 1
              self.qparams["ppn"] = mpi_procs
          else:
              if rest_cores != 0:
                  # Pack cores as much as possible.
                  num_nodes += 1
              self.qparams["nodes"] = num_nodes
              self.qparams["ppn"] = self.hw.cores_per_node
docs: Set the number of CPUs used for MPI.