Measuring Communication and Computation Overlap
Measuring Pure Communication Time
Iallgather
Iallgather_pure
Iallgatherv
Iallgatherv_pure
Iallreduce
Iallreduce_pure
Ialltoall
Ialltoall_pure
Ialltoallv
Ialltoallv_pure
Ibarrier
Ibarrier_pure
Ibcast
Ibcast_pure
Igather
Igather_pure
Igatherv
Igatherv_pure
Ireduce
Ireduce_pure
Ireduce_scatter
Ireduce_scatter_pure
Iscatter
Iscatter_pure
Iscatterv
Iscatterv_pure
PingPong, PingPongSpecificSource, PingPongAnySource
Use PingPong, PingPongSpecificSource, and PingPongAnySource for measuring startup and throughput of a single message sent between two processes. PingPongAnySource uses the MPI_ANY_SOURCE value for destination rank, while PingPong and PingPongSpecificSource use an explicit value.
PingPong Definition
Property |
Description |
---|---|
Measured pattern |
As symbolized between |
MPI routines |
MPI_Send, MPI_Recv |
MPI data type |
MPI_BYTE |
Reported timings |
time=Δt/2 (in μsec) as indicated in the figure below. |
Reported throughput |
X/time |
PingPong Pattern
