multithreading and clustering

Hello, I've read some posts about multithreading on one PC with dual-core  
proc. using clustering. Could anyone advise me, how exactly is this done?  
I've added 2 nodes with hostname "localhost" and ssh test has finished  
fine for both of them, but when I run task, one node shows progress line,  
but it stops on 0.1% and second shows only "running", but the job has no  
advance and processor is idle. No errors could be seen in log. What am I  
doing wrong?