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

[Tom Rini]

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On 11/01/12 14:01, Simon Glass wrote:
> 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?

My setup using MAKEALL does 921 boards (arm/powerpc/mips) with ELDK
5.2 in 54min wall-clock with 397% CPU util (on a 6 core machine).

- -- 
Tom
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