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

[Simon Glass]

Hi Andy / Tom,

On Wed, Oct 31, 2012 at 9:17 PM, Andy Fleming <afleming at gmail.com> wrote:
> 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.

As a bit of an unscientific test, what sort of time does it take to
build all 1000-or-so boards on your systems?

>
> Andy

Regards,
Simon