Reduce_scatter

The benchmark for the MPI_Reduce_scatter function. It reduces a vector of length L = X/sizeof(float) float items. The MPI data type is MPI_FLOAT. The MPI operation is MPI_SUM. In the scatter phase, the L items are split as evenly as possible. To be exact, for np number of processes:

L = r*np+s

where

In this case, the process with rank i gets:

Property

Description

Measured pattern

MPI_Reduce_scatter

MPI data type

MPI_FLOAT

MPI operation

MPI_SUM

Reported timings

Bare time

Reported throughput

None

Submit feedback on this help topic