Intel® VTune™ Amplifier XE and Intel® VTune™ Amplifier for Systems Help
OpenMP Potential Gain Imbalance shows maximum elapsed time that could be saved if the OpenMP construct is optimized to have no imbalance. It is calculated as summary of CPU time by all OpenMP threads spinning on a barrier divided by the number of OpenMP threads.
Significant time spent waiting on an OpenMP barrier inside of a parallel region can be a result of load imbalance. Consider using dynamic work scheduling to reduce the imbalance, where possible.