[GE users] Parallel environment

John Hearns john.hearns at streamline-computing.com
Thu May 29 19:47:24 BST 2008


On Thu, 2008-05-29 at 17:00 +0200, Fedele STABILE wrote:
> Even if i force PE to allocate 4 cpu with 
> allocation_rule 4
> i allocate only 1 cpu per node
> 
Emmmmm.... are you sure that the problem is with Gridingine here?

Remember, Gridengine does not "know" about your CPUs - in Gridengine you
deal in job slots, and as the manager of the system you can allocate
more jobs slots than there are CPUs (cores) - called oversubscription,
or indeed less if you want to.

Are you sure that it is not your MPI implementation with is allocating
once CPU per node?
As a diagnostic, print out the PE_HOSTFILE during your job start script
- the script with the PE runs when the job is started.


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