# Hybrid Parallel Efficiency

The Hybrid Parallel Efficiency (HPE) meassures the percentage of time outside the two parallel runtimes.

As in the original MPI model, this efficiency can be split between two components: the Hybrid Load Balance Efficiency (HLBE) and the Hybrid Communication Efficiencies (HCE); or it can also be expressed in terms of MPI Parallel Efficiency (MPI PE) and OpenMP Parallel Effienciency (OpenMP PE):

$HPE = HLBE \times HCE = MPI\_PE \times OpenMP\_PE$

In order to fully understand the formulas, you may also visit the glossary of the metrics terms.