Process Efficiency

Process Efficiency completely ignores thread behavior, and evaluates process utilization via two components:

Workload across processes
Communication across processes

These two can be measured with Computation Load Balance and Communication Efficiency respectively. Process Efficiency can be computed directly or as a product of these two sub-metrics:

$\begin{eqnarray*}PE=\frac{avg(time\; in\; OpenMP) + avg(serial\; computation) }{max(runtime)} \end{eqnarray*}$

= Computation Load Balance ⋅ MPI Communication Efficiency.

Where average time in OpenMP and average serial computation are computed as weighted arithmetic mean. If number of threads is equal across processes average time in OpenMP and average serial computation can be computed as ordinary arithmetic mean.