MPI Communicator Functions

In this section

• MPI_Comm_compare
  Compares two communicator handles.

• MPI_Comm_create
  Extracts a subset a group of processes for the purpose of separate Multiple Instruction Multiple Data (MIMD) computation in a separate communicator.

• MPI_Comm_dup
  Duplicates an existing communicator with associated key values.

• MPI_Comm_free
  Frees a communicator that is allocated with the MPI_Comm_dup, MPI_Comm_create, or MPI_Comm_split functions.

• MPI_Comm_rank
  Retrieves the rank of the calling process in the group of the specified communicator.

• MPI_Comm_size
  Retrieves the number of processes involved in a communicator, or the total number of processes available.

• MPI_Comm_split
  Partitions the group that is associated with the specified communicator into a specified number of disjoint subgroups.

• MPI_Comm_remote_group
  Accesses the remote group associated with the given inter-communicator.

• MPI_Comm_remote_size
  Determines the size of the remote group associated with an inter-communictor.

• MPI_Comm_test_inter
  Tests to see if a comm is an inter-communicator.

• MPI_Intercomm_create
  Creates an intercommuncator from two intracommunicators.

• MPI_Intercomm_merge
  Creates an intracommuncator from an intercommunicator.