hi: in mpich-1.2.x, we can use "mpirun -np 4 -machinefile filename cpi" to run mpi progs in different nodes. the only change is filename's content. but how can i do the same thing in mpich2. we can not use commands "mpiexec -np 4 -machinefile filename cpi" Who can help me? chenyu chenyu-tmlinux at hpclab.cs.tsinghua.edu.cn 2003-04-24