communicator¶

When compiled without MPI support, Communicator acts as if there is one MPI rank and 1 partition. To use MPI, compile HOOMD-blue with the option ENABLE_MPI=on and use the appropriate MPI launcher to launch Python. Then the Communicator class will configure and query MPI ranks and partitions. By default, Communicator starts with the MPI_COMM_WOLRD MPI communicator and the communicator is not available for user scripts.

Communicator also accepts MPI communicators from mpi4py. Use this to implement workflows with multiple simulations that communicate using mpi4py calls in user code (e.g. genetic algorithms, umbrella sampling).