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Date: Wed, 8 Nov 2006 14:04:29 +1100 From: David Chinner <dgc@....com> To: Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz> Cc: Albert Cahalan <acahalan@...il.com>, linux-kernel@...r.kernel.org Subject: Re: 2048 CPUs [was: Re: New filesystem for Linux] On Sat, Nov 04, 2006 at 11:36:49PM +0100, Mikulas Patocka wrote: > >>Does one Linux kernel run on system with 1024 cpus? I guess it > >>must fry spinlocks... (or even lockup due to spinlock livelocks) > > > >The SGI Altix can have 2048 CPUs. > > And does it run one image of Linux? Or more images each on few cpus? One image. > How do they solve problem with spinlock livelocks? By replacing contended spinlocks withsleeping locks, using no-lock techniques (e.g. per-cpu) or changing the algorithm to remove the contention point. w.r.t filesystem locking scalability, you should read this paper: http://oss.sgi.com/projects/xfs/papers/ols2006/ols-2006-paper.pdf Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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