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(21) MPI Collective Communication Modes Previous Top Next

MPI Collective Communication Routines



MPI_Function
Function Description
MPI_Bcast
Broadcast a message from on process to all others
MPI_Barrier
blocks until all processes have reached this routine
MPI_Reduce
Reduce values from all processes to a single value (add,mult, min, max, etc.)
MPI_Gather
Gathers together values from a group of processes
MPI_Scatter
Sends data from process to the other processes in a group
MPI_Allgather
Gathers data from all tasks and distributes it to all
MPI_Allreduce
Reduces values from all processes and distributes the result back to all processes



diagram of collective communications message passing


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mpi_comm_modes2.src  last modified Feb 14, 2011 Introduction Table of Contents
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