[Beowulf] scheduler policy design

John Hearns john.hearns at streamline-computing.com
Fri Apr 20 03:10:09 EDT 2007


Toon Knapen wrote:


> Additionally, in the case above, for optimising the efficiency of the 
> node, I might prefer to launch just 1 process which uses 4 threads to 
> perform multi-threaded (BLAS) calculations.

We help out customers deal with problems like that, and the above 
example on serial jobs.
The answer to this one would be to create a parallel queue with just one 
job slot, and prevent any other jobs from running on the node. The 
parallel job then gets the full resources of the node, and can run the 
multi-threaded calculations you want.
If you don't want jobs to be allocated that way, we have a 'multiway' 
queue for running several jobs per host.


-- 
      John Hearns
      Senior HPC Engineer
      Streamline Computing,
      The Innovation Centre, Warwick Technology Park,
      Gallows Hill, Warwick CV34 6UW
      Office: 01926 623130 Mobile: 07841 231235
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