[U-Boot] [PATCH 2/2] WIP: Test version of buildman - U-Boot builder

[Andy Fleming]

On Wed, Oct 31, 2012 at 8:18 PM, Tom Rini <trini at ti.com> wrote:
> On Wed, Oct 31, 2012 at 05:11:51PM -0700, Simon Glass wrote:
>
> [snip]
>> Also rather than running with 'make -j40' or whatever, it uses 'make
>> -j1' but with 40 threads. This increases CPU utilisation quite
>> substantially (almost 50%) - I think this was discussed some time ago,
>
> MAKEALL supports this, but doesn't default to it, today.  I'm wondering
> if we ought to make it the default for all non-single board builds.  The
> winning point is right around boards-to-build == `grep -c processor
> /proc/cpuinfo` and I think is right around setting NBUILDS to that
> value, both on consumer multicore and heavy-duty 32/64 core boxes.

Yeah, I usually set BUILD_NBUILDS to 24-50 on my 24-thread system, and
then set BUILD_NCPUS to 1-4. It's nice to offer a little bit of
parallelism on the individual builds, sometimes. I did a bunch of
tests, but not in a scientific fashion. Enough to agree with you that
maxing out builds seems to win for u-boot.

Andy