Universal Debugger
Universal Debugger
(tool, parallel)Udb is a source level debugger for testing and debuggingserial and parallel programs; it is compatible with GDB anddbx. The user can direct udb either by typing commands orgraphically through an X-based window interface; the latterprovides simultaneous display of source code, I/O andinstructions. For parallel programs, operations can becarried out per-thread.
http://tc.cornell.edu/Parallel.Tools/tools/udb.html.