Re: Job taking longer with more RAC nodes

Hi Mogens

What does Opteron differ from other chipsets that it can improve RAC?

Cheers

LSC On 3/26/06, Mogens Nørrgaard <mln_at_miracleas.dk> wrote:
>
> Well spoken. If you have a read-mostly app and/or tight node/user
> partitioning, you will minimize the necessary communication between
> nodes that ensures coherency and coordination. But that necessary
> overhead won't and can't go away, so apps can never run faster on RAC
> than non-RAC unless something else changes, too (like moving to
> Opterons, and so forth).
>
> Mogens
>
> john d parker wrote:
>
> >Do you have any degree of parallelism? or is parallel degree set to
> >default?
> >
> >In general, A well behaved app will perform approx the same on RAC
> >maybe even marginally slower. A poorly behaved app will absolutely
> >stink when moved to RAC. RAC is not a performance enhancing solution.
> >
> >
> >John
> >
> >
>
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>
>

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