Process Communication Efficiency measures the time cost introduced by process MPI communication. It ignores any MPI within OpenMP parallel regions, which are considered as contributing to thread inefficiency.
Process Communication Efficiency measures the cost of time in process MPI due to:
It has sub-metrics of Process Transfer Efficiency and Process Serialization Efficiency, which respectively identify if inefficiency results from data transfer over the network or is due to dependencies.
\[Process Communication Efficiency = \frac{Max(OpenMP + Serial Useful)}{Runtime} = Process\_TE + Process\_SE\]In order to fully understand the formulas, you may also visit the glossary of the metrics terms.