Collective Communication

Barrier

MPI_Barrier

Broadcast

MPI_Bcast

Processor Gather/Scatter

MPI_Gather
MPI_Gatherv
MPI_Allgather
MPI_Allgatherv
MPI_Scatter
MPI_Scatterv
MPI_Alltoall
MPI_Alltoallv

Global Reduction/Scan Operations

MPI_Reduce
MPI_Allreduce
MPI_Reduce_scatter
MPI_Scan
MPI_Op_create
MPI_Op_free