IntelĀ® MPI Library Reference Manual for Linux* OS
Use this option to print debug information from mpiexec.hydra, such as:
Service processes arguments
Environment variables and arguments passed to start an application
PMI requests/responses during a job life cycle
See the I_MPI_HYDRA_DEBUG environment variable for more details.
Use this option to print out the MPI rank mapping.
Use this option to print the exit codes of all processes.