Groups, Contexts, and Communicators

Group Management

Group Accessors

MPI_Group_size
MPI_Group_rank
MPI_Group_translate_ranks
MPI_Group_compare 

Group Constructors

MPI_Comm_group
MPI_Group_union
MPI_Group_intersection
MPI_Group_difference
MPI_Group_incl
MPI_Group_excl
MPI_Group_range_incl
MPI_Group_range_excl
MPI_Group_free

Communicator Management

Communicator Accessors

MPI_Comm_size
MPI_Comm_rank
MPI_Comm_compare

Communicator Constructors

MPI_Comm_dup
MPI_Comm_create
MPI_Comm_split
MPI_Comm_free

Intercommunicators

MPI_Comm_test_inter
MPI_Comm_remote_group
MPI_Comm_remote_size
MPI_Intercomm_create
MPI_Intercomm_merge

Communicator Attributes

MPI_Keyval_create: Deprecated - Use
MPI_Comm_create_keyval. 
MPI_Keyval_free: Deprecated - Use
MPI_Comm_free_keyval. 
MPI_Attr_put: Deprecated - Use
MPI_Comm_set_attr. 
MPI_Attr_get: Deprecated - Use
MPI_Comm_get_attr. 
MPI_Attr_delete: Deprecated - Use
MPI_Comm_delete_attr.