User Guide

Contents

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.

Product and Performance Information

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Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.