The Block Heuristic parameter controls the heuristic used to partition the model into blocks.  You may currently select from two graph partitioning algorithms named simply GP1 and GP2; simple set BNPHEU to 1 for GP1 and 2 for GP2.

For more information on block finding heuristics, the BNP solver and the BNPHEU parameter, refer to the section BNP Solver in Chapter 5.

The default setting for BNPHEU is 1, i.e., the GP1 graph partitioning algorithm.