To be more exactly and short: 1) All the limits are the same for root and "guest" (used for MPI test) 2) It's now right for both rsh and ssh calls 3) mvapich-0.9.8 works OK under root 4) But under guest mpirun_rsh w/both -rsh and -ssh fails in viainit.c And what else is the difference between root and guest ? Yours Mikhail