(udb)
KSR's interactive source level debugger for serial and parallel programs written in
KSR,
Fortran, KSR C and KSR1
assembly language.
Udb is a source level debugger for testing and debugging
serial and parallel programs; it is compatible with
GDB and
dbx. The user can direct udb either by typing commands or
graphically through an
X-based window interface; the latter
provides simultaneous display of source code, I/O and
instructions. For parallel programs, operations can be
carried out per-
thread.
http://tc.cornell.edu/Parallel.Tools/tools/udb.html.