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From Burn Lewis <burnle...@gmail.com>
Subject Re: Scale out tuning for jobs
Date Thu, 16 Oct 2014 14:32:22 GMT
Yes, that parameter only limits the maximum scaleout.  DUCC will ramp up
the number of processors based on the available resources and the amount of
work to be done.  It initially starts only 1 or 2 and only when one
initializes successfully will it start more.  It may not start more if it
suspects that all the work will be completed on the existing nodes before
any new ones are ready.

There is an additional type of scaleout, within each process, controlled by
--process_thread_count which controls how many threads in each process are
capable of processing separate work items.


On Wed, Oct 15, 2014 at 7:11 PM, Amit Gupta <gupta.v.amit@gmail.com> wrote:

> Hi,
> I've been trying to find the options related to configuration of scaleout
> of a ducc job.
> Thus far the only ones Ive found are:
> process_deployments_max:
> which limits the maximum number of processes spawned by a ducc job.
> At what point does DUCC decide to spawn a new process or spread processing
> out to a new node. Is there a tuning parameter for an optimal number of
> work items per process spawned? Can the user control this behavior?
> For example,
> I have a job large enough that DUCC natively spreads it across 2 nodes.
> I havent been able to force this job, via a config parameter, to spread
> across 4 nodes (or "X" nodes) for faster processing times.
> Does anyone know if theres a parameter than can directly control scaleout
> in this manner?
> Thanks,
> --
> Amit Gupta

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