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On Thu, Mar 25, 2004 at 09:30:32PM +0100, Ingo Molnar wrote: > > * Andi Kleen <ak@suse.de> wrote: > > > That won't help for threaded programs that use clone(). OpenMP is such > > a case. > > this patch: > > redhat.com/~mingo/scheduler-patches/sched-2.6.5-rc2-mm3-A4 > > does balancing at wake_up_forked_process()-time. > > but it's a hard issue. Especially after fork() we do have a fair amount > of cache context, and migrating at this point can be bad for > performance. I ported it by hand to the -mm4 scheduler now and tested it. While it works marginally better than the standard -mm scheduler (you get 1 1/2 the bandwidth of one CPU instead of one) it's still still much worse than the optimum of nearly 4 CPUs archived by 2.4 or the standard scheduler. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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