Introduction To this end, many routines are available in the mPi librar to perform various communication-related tasks. These are MPI COMM GROUP MPI GROUP NCL MPI GROUP EXCL MPI GROUP RANK MPI GROUP FREE MPI COMM CREATE MPI COMM SPLIT These routines are described in the following sectionsIntroduction • To this end, many routines are available in the MPI library to perform various communication-related tasks. These are – MPI_COMM_GROUP – MPI_GROUP_INCL – MPI_GROUP_EXCL – MPI_GROUP_RANK – MPI_GROUP_FREE – MPI_COMM_CREATE – MPI_COMM_SPLIT • These routines are described in the following sections