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Debugging with GDB

compile programme with -g -o0 (or ./configure --enable-debug)

For serial programme (or MPI running with 1 process)

gdb ./programme_name

To debug MPI application in parallel add this line to somewhere in the code:

if (!rank) getc(stdin); MPI_Barrier(MPI_COMM_WORLD);

Then run the code and it will hang on that line.

If you get the gdb error:

fupermod_....c: No such file or directory.

Run the following command to add to gdb's source directories to be searched:

directory ~/fupermod/