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    SubjectRe: [ck] Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
    On Wed, 18 Apr 2007 10:22:59 -0700 (PDT)
    Linus Torvalds <torvalds@linux-foundation.org> wrote:

    > So if you have 2 users on a machine running CPU hogs, you should
    > *first* try to be fair among users. If one user then runs 5 programs,
    > and the other one runs just 1, then the *one* program should get 50%
    > of the CPU time (the users fair share), and the five programs should
    > get 10% of CPU time each. And if one of them uses two threads, each
    > thread should get 5%.

    This sounds great, to me.

    One minor question: is it even possible to be completely fair on SMP?
    For instance, if you have a 2-way SMP box running 3 applications, one of
    which has 2 threads, will the threaded app have an advantage here? (The
    current system seems to try to keep each thread on a specific CPU, to
    reduce cache thrashing, which means threads and processes alike each
    get 50% of the CPU.)

    Mark
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