Re: [Gumstix-users] ubuntu 10.10 64 bit build machine setup -- sysctl & bitbake & i7 questions

[J. L. <vwy...@gm...>]

On Sun, Oct 17, 2010 at 5:33 PM, Dave Hylands <dhy...@gm...> wrote:
> Hi Ash,
>
> ...snip...
>> P.S.  I have a secret desire to see the plot of build time versus # of
>> PARALLEL_MAKE or BB_NUMBER_THREADS for, say, a console image. Hmm...
>
> I have a couple of data points.
>
> I have a
>
> 2.67 GHz Core I7-920 (quadcore)
> 8 GB of DDR3 memory (4 x 1GB + 2 x 2GB)
> 1 TB HD (7200 RPM, 32MB) Hitachi HDS721010KLA330
>
> I did a build to grab all of the tarballs and git clones and stuff and
> then did an rm -rf of /tmp
>
> It took 3.75 hours to do: bitbake omap3-console-image
>
> So then I played with PARALLEL_MAKE and BB_NUMBER_THREADS.
>
> Setting them both to 4, dropped the build time to 83 minutes (1.4 hours).
> Setting them both to 8 increased the time to 87 minutes, so there is a
> sweet spot in there somewhere.
> Setting threads to 3 and make to 6 took 84 minutes.
> Setting threads to 4 and make to 2 took 88 minutes.
>
> This was captured in January of this year (I pulled the email from the
> archives), so may not be exactly reflective of todays environment.
>
> --
> Dave Hylands
> Shuswap, BC, Canada
> http://www.DaveHylands.com/
>
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Thanks for posting that dave after I get my first build I will have to
try that and see the differences.
I have a very similar setup. i7-740QM 8gb-DDR3 7200rpm 1TB x2