PPBB

The Portable Parallel Branch-and-Bound Library ( PPBB-Library ) presents an easy way to parallelize sequential Branch-and-Bound algorithms for several architectures. A user of the library, who wants to run his sequential algorithm on a parallel system, needs neither knowledge about the hardware architecture nor the parallelization mechanisms. Each parallel running process of the Branch-and-Bound application maintains the point of view of the sequential algorithm. The library overtakes the management of the subproblems, which are created during execution of the Branch-and-Bound algorithm. Load balancers provided by the library take care of a balanced distribution of the subproblems. The quality of the load balancing strategy is essential for the parallel performance of a sequential efficient Branch-and-Bound algorithm. The user of the library is able to implement own load balancing strategies instead of using the application-independent load balancing algorithms included in the library. Thus, on the first hand the library can be used for the automatic parallelization of sequential Branch-and-Bound algorithms. On the other hand it can be used for implementing and testing load balancing strategies while the loads are provided by a particular Branch-and-Bound application. The library is designed to run on any distributed memory multicomputer architecture using the given message passing functions and is written in C.

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