[Devel] Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface)

Chris Friesen cfriesen at nortel.com
Fri Aug 18 12:16:55 PDT 2006

Paul Jackson wrote:

> The fair sharing model (such as in CKRM) that strives for maximum
> utilization of resources respecting priorities and min/max limits is
> (I suppose) quite useful for certain workloads and customers.
> The hardwall NUMA placement model (such as in cpusets) that strives
> for maximum processor and memory isolation between jobs, preferring
> to leave allocated resources unused rather than trying to share them,
> is also quite useful for some.  Customers with 256 thread, one or
> two day long run time, -very- tightly coupled huge OpenMP Fortran
> jobs that need to complete within a few percent of the same time,
> every runtime, demand it.

Hypothetically, if you can guarantee that those threads get a specified 
amount of time, but may possibly get *more* cpu time and thus finish 
faster, what's the problem?


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