Basic HTML version of Foils prepared 19 September 98

Foil 42 Some Collective Communication Operations

From MPI Message Passing Interface Computational Science for Simulations -- Fall Semester 1998. by Geoffrey C. Fox, Nancy McCracken
1 MPI_BARRIER(comm) Global Synchronization within a given communicator
2 MPI_BCAST Global Broadcast
3 MPI_GATHER Concatenate data from all processors in a communicator into one process
  • MPI_ALLGATHER puts result of concatenation in all processors
4 MPI_SCATTER takes data from one processor and scatters over all processors
5 MPI_ALLTOALL sends data from all processes to all other processes
6 MPI_SENDRECV exchanges data between two processors -- often used to implement "shifts"
  • this viewed as pure point to point by some
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