The OpenMP Load Balance Efficiency (OpenMP LBE) is defined as the quotient of the Hybrid Load Balance Efficiency (HLBE) and the MPI Load Balance Efficiency (MPI LBE) and represents the load balance within the OpenMP part of the program.
\[OpenMP\_LBE = \frac{HLBE}{MPI\_LBE}\]In order to fully understand the formulas, you may also visit the glossary of the metrics terms.