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    SubjectRe: SMP/cc Cluster description
    On Thu, Dec 06, 2001 at 03:08:47PM -0800, David S. Miller wrote:
    > From: Benjamin LaHaise <>
    > Date: Thu, 6 Dec 2001 17:27:08 -0500
    > - lower overhead for SMP systems. We can use UP kernels local
    > to each CPU. Should make kernel compiles faster. ;-)
    > Actually, this isn't what is being proposed. Something like
    > "4 cpu" SMP kernels.

    I personally want to cluster small SMP OS images because I don't want to
    do the process migration crap anywhere except at exec time, it simplifies
    a lot. So I need a second order load balancing term that I can get
    from 2 or 4 way smp nodes. If you are willing to process migration to
    handle load imbalances, then you could do uniprocessor only. I think
    the complexity tradeoff is in favor of the small SMP OS clusters, we
    already have them. Process migration is a rats nest.

    > At the very least it is well worth investigating. Bootstrapping the
    > ccCluster work shouldn't take more than a week or so, which will let
    > us attach some hard numbers to the kind of impact it has on purely
    > cpu local tasks.
    > I think it is worth considering too, but I don't know if a week
    > estimate is sane or not :-)

    Yeah, it's possible that you could get something booting in a week but I
    think it's a bit harder than that too. One idea that was kicked around
    was to use Jeff's UML work and "boot" multiple UML's on top of a virtual
    SMP. You get things to work there and then do a "port" to real hardware.
    Kind of a cool idea if you ask me.
    Larry McVoy lm at
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