Re: Scaling noise

Steven Cole
2003-09-04T02:44:42Z

On Wed, 2003-09-03 at 20:35, William Lee Irwin III wrote:
> On Wed, Sep 03, 2003 at 08:19:26PM -0600, Steven Cole wrote:
> > I would never call the SMP locking pathetic, but it could be improved.
> > Looking at Figure 6 (Star-CD, 1-64 processors on Altix) and Figure 7
> > (Gaussian 1-32 processors on Altix) on page 13 of "Linux Scalability for
> > Large NUMA Systems", available for download here:
> > http://archive.linuxsymposium.org/ols2003/Proceedings/
> > it appears that for those applications, the curves begin to flatten
> > rather alarmingly. This may have little to do with locking overhead.
>
> Those numbers are 2.4.x

Yes, I saw that. It would be interesting to see results for recent
2.6.0-textX kernels. Judging from other recent numbers out of osdl, the
results for 2.6 should be quite a bit better. But won't the curves
still begin to flatten, but at a higher CPU count? Or has the miracle
goodness of RCU pushed those limits to insanely high numbers?

Steven