Messages in this thread | | | Date | Thu, 04 Sep 2003 13:20:16 +1000 | From | Nick Piggin <> | Subject | Re: Scaling noise |
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Steven Cole wrote:
>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? >
They fixed some big 2.4 scalability problems, so it wouldn't be as impressive as plain 2.4 -> 2.6. However there are obviously hardware scalability limits as well as software ones. So a more interesting comparison would of course be 2.6 vs LM's SSI clusters.
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