$ mpirun C -v -vv -ssi rpi tcp /sbox/yamend/r33/amd64_linux24/64/bin/TWTgen
IN kinit - regiester_pid getpid = 25833
IN kinit - _kid.ki_pid = 0
IN kinit - calling _ksig_init
25834 /sbox/yamend/r33/amd64_linux24/64/bin/TWTgen running on n0 (o)
mpirun: waiting for MPI_INIT from 1 processes...
Calling MPI_Init
IN MPI_Init - calling lam_setfunc
IN MPI_Init - returned from lam_setfunc
IN MPI_Init - calling lam_mpi_init
IN lam_mpi_init - calling Initialized
IN lam_mpi_init - Initialized = 0
IN lam_mpi_init - Finalized = 0
IN lam_mpi_init - calling lam_tv_load_type_defs
IN lam_mpi_init - calling lam_linit
IN lam_linit - calling kenter /sbox/yamend/r33/amd64_linux24/64/bin/TWTgen
IN lam_linit - before kenter errno = 0
IN kenter - calling kinit
IN lam_linit - errno = 471
IN lam_linit - returning errno=1239
IN lam_linit - returning LAMERROR=-1
mpirun: someone died before MPI_INIT -- rank 0
-----------------------------------------------------------------------------
It seems that [at least] one of the processes that was started with
mpirun did not invoke MPI_INIT before quitting (it is possible that
more than one process did not invoke MPI_INIT -- mpirun was only
notified of the first one, which was on node n0).

mpirun can *only* be used with MPI programs (i.e., programs that
invoke MPI_INIT and MPI_FINALIZE). You can use the "lamexec" program
to run non-MPI programs over the lambooted nodes.
-----------------------------------------------------------------------------
mpirun: receiving 0 useless MPI_INIT/MPI_FINALIZE messages...