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DragonFly users List (threaded) for 2006-09
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Re: PF & SMP

From: Joerg Sonnenberger <joerg@xxxxxxxxxxxxxxxxx>
Date: Fri, 22 Sep 2006 21:08:09 +0200
Mail-followup-to: users@crater.dragonflybsd.org

On Fri, Sep 22, 2006 at 09:38:31AM -0700, Matthew Dillon wrote:
>     As part of my parallel buildworld test I record the contention
>     count delta for each -j 8 build.  I typically get numbers in the
>     800-900 million range.  x 100 ns pertick == about 100 seconds of wasted
>     of cpu (for both cpus together) for a buildworld that takes 1450 seconds,
>     and dividing by the two cpus, that probably represents a real-world
>     loss in build time of between 4% and 7% over what it could hav achieved.
>     That is a very rough estimate, I haven't actually measured what a 'tick'
>     is... it could be less then 100ns but I don't think it is more.

Hm. On my build machine: around 3e6/s during a parallel build...


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