Allreduce is a collective algorithm that combines the values supplied by each process of the other group into a single value available to all processes. The values are combined in a user-defined way, specified via a delegate. If value1, value2, ..., valueN are the values provided by the N processes in the communicator, the result will be the value value1 op value2 op ... op valueN.

Namespace:  MPI
Assembly:  MPI (in MPI.dll)
Version: (


public T Allreduce<T>(
	T value,
	ReductionOperation<T> op
Visual Basic (Declaration)
Public Function Allreduce(Of T) ( _
	value As T, _
	op As ReductionOperation(Of T) _
) As T
Visual C++
generic<typename T>
T Allreduce(
	T value, 
	ReductionOperation<T>^ op


Type: T
The local value that will be combined with the values provided by other processes and sent to each process in the other group.
Type: MPI..::.ReductionOperation<(Of <(T>)>)
The operation used to combine two values. This operation must be associative.

Type Parameters

Any serializable type.

Return Value

The result of the reduction. The same value will be returned to all processes in a group.

See Also