MPI Busy Wait Time
Metric Description
MPI Busy Wait Time is CPU time when MPI runtime
library is spinning on waits in communication operations. High metric value can
be caused by load imbalance between ranks, active communications or nonoptimal
settings of MPI library. Explore details on communication inefficiencies with
Intel® Trace Analyzer and Collector.
Possible Issues
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 MPI library. Explore details on
communication inefficiencies with Intel Trace Analyzer and Collector.