mpi split communicator
- Use the MPI_Comm_size function to determine the number of processes in the original communicator.
- Use the MPI_Comm_rank function to obtain the rank of the calling process in the original communicator.
- Use the MPI_Comm_split function to create new communicators based on the ranks of the processes in the original communicator.
- Specify the color and key parameters to control the creation of the new sub-communicators.
- Use the new communicators for communication and coordination among the processes with similar color values.