Joe,
Thanks for the quick reply! 

> > I starts running, and in debug mode it copies the fragments to the
> worker nodes, then the only process doing any work is on the 
> fist node in the list, it runs for several hours then dies. 
> Nothing is in the output file.
> 
> Does it stop working after a particular size?  That is, if 
> you divide your input file in half, does it work?  By a 1/10?

I split the file into 8 pieces (about 4MB per piece) and it now appears
to run correctly, it does take about 15 minutes before the work starts
on the worker nodes, but after that it appears to function ok. 
Is there a limit to the input file size?? The original file is about 36
MB.. 

> 
> While it is running for several hours, are you sure the other 
> nodes are not doing anything?  Have you run top on them?  On 
> the node with the process running, what do top and vmstat 1 
> report for memory usage?
> 
I did run top, and ps -ef |grep mpi,  the processes are there, just not
doing anything..

> You might try running without the -nolocal switch (just don't 
> start the job on the head node).

 


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