From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Adriano Galano" Date: Mon, 05 May 2003 09:08:07 +0000 Subject: RE: [Linux-ia64] benchmarking results Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Hi Steve: > > >>>>> On Wed, 30 Apr 2003 18:17:45 +0200, "Adriano Galano" > said: > > > > Adriano> We need to find some reference of SMP > scalability on Linux > > Adriano> scheduler. For 1, 2, 4 and 8 processor. How "lineal" is > > Adriano> this scalability? Does Linux perform well en 4 > or 8 Itanium > > Adriano> 2 architecture? > > > > David Mosberger wrote: > > There is no single answer to the scalability question. It totally > > depends on what application you're running. SGI has shown that > > certain apps scale very nicely all the way to 64 CPUs on their Altix > > box. Kernel-intensive apps won't scale that far, but even > there there > > is some evendice of very nice scaling. ... > > Hi Adriano, > > As David points out, there's a lot of factors that can affect > scalability > results for a particular workload. If you haven't already, > you might want > to check out the following from the February 2003 issue of > Linux Journal > magazine: http://linuxjournal.com/article.php?sidd40, which > provides more > background on the SGI Altix system along with some scaling > and benchmark results. > Thanks for the reference. Maybe in all the cases I can see NUMA architectures and not find references related to what kind of scheduler was used older sched, O(1) or HT? The limits of the bricks for SMP are 4 proc, how could I assume linear scalability for 8 proc having memory latency accesing the others bricks through R-Brick maybe? Regards, -Adriano > Hope that helps. > > --steve