code: def with_fixed_mpi_omp(self, mpi_procs, omp_threads):
          
          manager = self.manager if hasattr(self, "manager") else self.flow.manager
          self.manager = manager.new_with_fixed_mpi_omp(mpi_procs, omp_threads)
docs: Disable autoparal and force execution with `mpi_procs` MPI processes
          and `omp_threads` OpenMP threads. Useful for generating benchmarks.