[Beowulf] active process

Reuti reuti at staff.uni-marburg.de
Tue Aug 2 13:15:07 EDT 2005


Ru-Zhen,

are you starting a program which is prepared for parallel execution and 
well integrated into PBS or any other queuing system? No magic will 
execute a serial application in parallel just by requesting more nodes 
in PBS - as I understand your question in this way. The only thing PBS 
can do in this case is to reserve the nodes and start the main 
script/job of a parallel application on one node. But all the processes 
on the slave nodes must be initiated by the application on it's own - 
perhaps by using a parallel lib like MPI, PVM, Linda, Charm++, 
GlobalArrays... and revised program coding according to those libs.

Cheers - Reuti


Ru-Zhen Li wrote:
> Dear All,
>  
> I have a problem with my cluster, I tried to define different numbers of 
> nodes in the PBS script, and different memory, however, the time used to 
> finish the job is exactly the same, and when I checked, I found there is 
> only one active process on all the nodes I defined for the job, does 
> anyone have any idea why this happens?
>  
> Thanks a lot!
>  
> Best wishes,
>  
> Ruzhen
> 
> 
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