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The ch_nexus device allows you to use
Nexus debugging facilities only if you link against the debug version of
mpich and Nexus. You can then pass the following parameters to your program using mpirun:
-Dnexus: This command sets the trace level (0-9). 0 will
give you nothing, and 9 will give you more than you can
effectively use. Suggested values are 2 or 3.
-
-debug_display: This command gives the X windows screen
name that the debugger should be displayed on. One debugger
will start for each process (except the starting node). Use the
go command within the debugger to start your program with the right
parameters.
-
-debug_command: This command tells where to find the
script to start up a debugger for each process. This should be
generated automatically with configure -device=ch_nexus
in either /usr/local/mpi/bin/rundbx or
/usr/local/mpi/bin/rungdb.
Additional options are supported. See the Nexus Users Guide in WEB.
So, to run a program at trace level 3, one would enter:
mpirun -np 2 program -mpi -Dnexus 3
Be sure to include the -mpi before any of the debugging flags. See the
debugging section of the Nexus User's Guide for more details on how to
debug ch_nexus programs.
Up: Debugging MPI programs
Next: Command-line arguments for the application program
Previous: p4 arguments for debugging