Below there are examples how to submit ADF parallel jobs with 4 8 and 16 jobs (third line gives flexibility):
qsub -pe mpi 4 -q node33.q /apps/bin/runadf_2007mpi_tst test_long
qsub -pe mpi 8 -q node33.q,node34.q /apps/bin/runadf_2007mpi_tst test_long
qsub -pe mpi 1,2,4,8,16 -q node33.q,node34.q,node35.q,node36.q /apps/bin/runadf_2007mpi_tst test_long