[yocto] what's the proper value for BB_NUMBER_THREADS?

[Robert P. J. Day]

On Mon, 31 Oct 2011, Mark Hatle wrote:

> On 10/30/11 11:15 AM, Robert P. J. Day wrote:
> > On Sun, 30 Oct 2011, Christian Gagneraud wrote:
> >
> >> On 30/10/11 15:32, Robert P. J. Day wrote:
> >>>
> >>>    all the docs recommend twice the number of cores (AFAICT), yet the
> >>> template local.conf file suggests that, for a quad core, the value of
> >>> 4 would be appropriate.  shouldn't that say 8?  same with
> >>> PARALLEL_MAKE?
> >>
> >> Hi Robert,
> >>
> >> The Poky ref manual says (rule of thumb) x2 for BB_NUMBER_THREADS,
> >> and x1.5 for PARALLEL_MAKE.
> >
> >   if that's the case, anyone object to my submitting a patch to
> > update local.conf.sample appropriately?
> >
> > rday
> >
>
> I agree the manual and local.conf files should match.  The issue
> seems to be that the perfect values are subjective.  Things like
> memory, disk speed, chipset latency, and of course processor
> speed/cores all affect the optimal setting. But we do need a
> consistent rule of thumb..  I myself usually use x2 for both THREADS
> and MAKE.

  that's what i would normally use, assuming that having an overly
high value for either of those settings can't possibly hurt.  if
that's the consensus, i can adjust the references to say 2x everywhere
that i know of.  just let me know.

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
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