MPI Communication Efficiency

MPI Communication Efficiency can be evaluated directly by following formula:

$\begin{eqnarray*}MPI\; Communication\; Efficiency=\frac{max(time\; outside\; of\; MPI)}{max(runtime)} \end{eqnarray*}$

This metric identifies when code is inefficient because it spends a large amount of time communicating rather than performing useful computations.