Back to SYMPHONY Home Page

Configuring the Modules.

In the application makefile, e.g., SYMPHONY-4.0/USER/Makefile,there are four variables that control which modules run as separate executables and which are called directly in serial fashion. The variables are as follows:

COMPILE_IN_CG:

If set to TRUE, then the cut generator function will be called directly from the LP in serial fashion, instead of running as a separate executable. This is desirable if cut generation is quick and running it in parallel is not worth the price of the communication overhead.

COMPILE_IN_CP:

If set to TRUE, then the cut pool(s) will be maintained as a data structure auxiliary to the tree manager.

COMPILE_IN_LP:

If set to TRUE, then the LP functions will be called directly from the tree manager. When running the distributed version, this necessarily implies that there will only be one active subproblem at a time, and hence the code will essentially be running serially. IN the shared-memory version, however, the tree manager will be threaded in order to execute subproblems in parallel.

COMPILE_IN_TM:

If set to TRUE, then the tree will be managed directly from the master process. This is only recommended if a single executable is desired (i.e. the three other variables are also set to true). A single executable is extremely useful for debugging purposes.

These variables can be set in virtually any combination, though some don't really make much sense. Note that in a few user functions that involve process communication, there will be different versions for serial and parallel computation. This is accomplished through the use of #ifdef statements in the source code. This is well documented in the function descriptions and the in the source files containing the function stubs. See also Section 4.2.7.