SYMPHONY requires the use of a third-party
callable library to solve the LP relaxations once they are formulated. The
LP solver is called through Open Solver Interface, also available from
The list of solvers with OSI interfaces currently numbers eight and includes
both commercial and open source alternatives. By default, SYMPHONY now uses
the COIN LP solver (Clp). However, if another LP solver is desired, this is
possible by changing the configuration settings.