Ireduce_scatter#
The benchmark for MPI_Ireduce_scatter that measures communication
and computation overlap. 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
r = ⌊L/np⌋s = L mod np
In this case, the process with rank i gets:
r+1items wheni<sritems whenis
Property |
Description |
|---|---|
Measuredpattern |
|
MPI data type |
|
MPI operation |
|
Reportedtimings |
For details, see Measuring Communication and Computation Overlap. |
Reportedthroughput |
None |