Intel® VTune™ Amplifier
MPI Communication Spin time is CPU time when the MPI runtime library is spinning on waits in communication operations.
CPU time spent on waits for MPI communication operations is significant and can negatively impact the application performance and scalability. This can be caused by load imbalance between ranks, active communications or non-optimal settings of the MPI library. Explore details on communication inefficiencies with Intel Trace Analyzer and Collector.