The LP Engine

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 COIN . 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.