Messages in this thread | | | Subject | Re: Scaling noise | From | Steven Cole <> | Date | 03 Sep 2003 20:40:43 -0600 |
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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
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