I cant figure out how to request 9 cpus from 2 cpus nodes when i want most cpus to use ppn=2 I tried #PBS -l nodes=4:ppn=2+nodes=1:ppn=1 But gets rejected by the server. I could do nodes=9:ppn=1 but i want ppn=2 as much as i can. Brock Palen Center for Advanced Computing brockp at umich.edu (734)936-1985