Date: Fri, 23 Dec 2011 15:24:43 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-stable@freebsd.org, Andriy Gapon <avg@freebsd.org> Subject: Re: SCHED_ULE should not be the default Message-ID: <20111223232443.GA64459@troutmask.apl.washington.edu> In-Reply-To: <CAJ-Vmon69r-341aMutBAHT_VCMkM9afzu=4sBd7s7zqFiK%2BEVA@mail.gmail.com> References: <20111215215554.GA87606@troutmask.apl.washington.edu> <CAJ-FndD0vFWUnRPxz6CTR5JBaEaY3gh9y7-Dy6Gds69_aRgfpg@mail.gmail.com> <20111222005250.GA23115@troutmask.apl.washington.edu> <20111222103145.GA42457@onelab2.iet.unipi.it> <20111222184531.GA36084@troutmask.apl.washington.edu> <4EF37E7B.4020505@FreeBSD.org> <20111222194740.GA36796@troutmask.apl.washington.edu> <CAJ-VmokeyDrKb-yQkzTm8tnOYcRm603hz%2B6nen10F3zFQVmCEQ@mail.gmail.com> <20111223191146.GA56232@troutmask.apl.washington.edu> <CAJ-Vmon69r-341aMutBAHT_VCMkM9afzu=4sBd7s7zqFiK%2BEVA@mail.gmail.com>
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On Fri, Dec 23, 2011 at 02:49:51PM -0800, Adrian Chadd wrote: > On 23 December 2011 11:11, Steve Kargl <sgk@troutmask.apl.washington.edu> wrote: > > > One difference between the 2008 tests and today tests is > > the number of available cpus. ?In 2008, I ran the tests > > on a node with 8 cpus, while today's test used only a > > node with only 4 cpus. ?If this behavior is a scaling > > issue, I can't currently test it. ?But, today's tests > > are certainly encouraging. > > Do you not have access to anything with 8 CPUs in it? It'd be nice to > get clarification that this indeed was fixed. I have a few nodes with 8 cpus, but those are running 4BSD kernels. I try to keep my kernel and world sync, and by extension the kernel/world on each node is in sync with all other nodes. So, while I took the 4 cpu node off-line and updated it, at the moment I can't take another node off-line unless I do an update across the entire cluster. The update is planned for next year. > Does ULE care (much) if the nodes are hyperthreading or real cores? > Would that play a part in what it tries to schedule/spread? I only have opteron processors in the cluster, if you're referring to Intel's hypertheading technology, I can't look into ULE's behavior with HTT. -- Steve
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