This is very short lesson. ... The reason of this is that dynamic load balancing allows the PC GAMESS/Firefly to use coarser-grained parallel algorithms with much less work duplicated across nodes and typically with much more efficient, optimized memory access patterns. ... To activate dynamic load balancing, just add the following line to your PC GAMESS/Firefly input: . ... Details on the MP2 energy code and p2p interface implementation in the PC GAMESS/Firefly. ...