Before You Begin Debugging an MPI Application

Before you begin, ensure that the environment variable IDB_HOME is set to the debugger’s install directory.

If you use MPICH, ensure that the script mpirun_dbg.idb that comes with the debugger is in the /bin/ directory of the MPICH installation.

If you use Intel® MPI 3.0, ensure that the environment variable MPIEXEC_DEBUG is defined so that MPI processes suspend their execution to wait for the debuggers to attach to them.