MPI Collective Functions

In this section

• MPI_Allgather
  Gathers data from all members of a group and sends the data to all members of the group.

• MPI_Allgatherv
  Gathers a variable amount of data from each member of a group and sends the data to all members of the group.

• MPI_Allreduce
  Combines values from all processes and distributes the result back to all processes.

• MPI_Alltoall
  Gathers data from and scatters data to all members of a group.

• MPI_Alltoallv
  Gathers data from and scatters data to all members of a group.

• MPI_Alltoallw
  Gathers data from and scatters data to all members of a group.

• MPI_Barrier
  Initiates barrier synchronization across all members of a group.

• MPI_Bcast
  Broadcasts data from one member of a group to all members of the group.

• MPI_Gather
  Gathers data from all members of a group to one member.

• MPI_Gatherv
  Gathers variable data from all members of a group to one member.

• MPI_Iallgather
  Gathers data from all members of a group and sends the data to all members of the group in a non-blocking way.

• MPI_Iallreduce
  Combines values from all processes and distributes the result back to all processes in a non-blocking way.

• MPI_Ibarrier
  Performs a barrier synchronization across all members of a group in a non-blocking way.

• MPI_Ibcast
  Broadcasts a message from the process with rank "root" to all other processes of the communicator in a non-blocking way.

• MPI_Igather
  Gathers data from all members of a group to one member in a non-blocking way.

• MPI_Igatherv
  Gathers variable data from all members of a group to one member in a non-blocking way.

• MPI_Ireduce
  Performs a global reduce operation (for example sum, maximum, or logical and) across all members of a group in a non-blocking way.

• MPI_Iscatter
  Scatters data from one member across all members of a group in a non-blocking way. This function performs the inverse of the operation that is performed by the MPI_Igatherfunction.

• MPI_Iscatterv
  MPI_Reduce
  Performs a global reduce operation across all members of a group.

• MPI_Scatter
  Scatters data from one member across all members of a group.

• MPI_Scatterv
  Scatters data from one member across all members of a group.

• MPI_Exscan
  Computes the exclusive scan (partial reductions) of data on a collection of processes.

• MPI_Op_create
  Creates a user-defined combination function handle.

• MPI_Op_free
  Frees a user-defined combination function handle.

• MPI_Reduce_local
  Applies a reduction operator to local arguments.

• MPI_Reduce_scatter
  Combines values and scatters the results.

• MPI_Scan
  Computes the scan (partial reductions) of data on a collection of processes.

• MPI_User_function
  MPI_User_function is a placeholder for the application-defined function name.