I am running an OpenMPI program on a linux cluster with 4 quad cores per node.

I use qstat -n jobID to check how many processes working in parallel and find that :


But, when I use ssh to be on a node , e..g ssh node175,

I use top command to check how many processes working on node 175 and find that
there are only one process working, not 8 processes.

Would you please tell me how to check the processes number on one node ?

Any  help will be appreciated. 


Jinxu Ding