Note
The debugger does not currently support attaching for prun and the Intel® MPI Library.
To attach the debugger to an existing MPICH job enter the following command in a shell:
idb -pid spawner_pid -parallelattach spawner_filename
spawner_pid is the ID of the process that spawned all the processes in the job. You can use the Linux command ps -xf to find the ID of this process. spawner_filename is the name of the spawner executable.