[Buildroot] Speeding up builds

Dallas Clement dallas.a.clement at gmail.com
Mon Nov 4 19:41:28 UTC 2013

Hi Thomas,

It's BR2_JLEVEL=0, and I have confirmed that when make is invoked it is -j
16  (8 cores X 2) on my build system.

I have tried ccache, ran into problems, and ended up aborting.  I may pick
up that effort again.

My focus right now is reducing the build time for a fresh clean build with
no caching or exisiting object files.

That's a bummer about the configure steps being serialized.  I have
observed this as well.



On Mon, Nov 4, 2013 at 1:06 PM, Thomas De Schampheleire <
patrickdepinguin at gmail.com> wrote:

> Hi Dallas,
> Dallas Clement <dallas.a.clement at gmail.com> wrote:
> >Hi All,
> >
> >I'm just looking for some tips on how to speed up my build times.  My
> >rootfs contains many packages with lots of dependencies.  Even with 8 fast
> >Xeon cores, 64GB of RAM, SSDs, and SAS drives, my builds are taking 1 hour
> >and 50 minutes.
> >
> >When I observe CPU utilization with htop, I rarely see more than one CPU
> >core getting worked hard.  Occasionally, I will see all 8 cores maxed at
> >100%.
> >
> >make -j 16 seems to make little difference.
> >
> >What can I do to get all my CPU cores working all the time?
> What is the value of BR2_JLEVEL in your .config?
> And have you tried enabling ccache?
> What takes a significant amount of time are the configure steps of all
> packages, which are not parallelized.
> Best regards,
> Thomas
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