Hi,
On Thu, Nov 1, 2012 at 4:29 PM, Tom Rini trini@ti.com wrote:
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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@gmail.com wrote:
On Wed, Oct 31, 2012 at 8:18 PM, Tom Rini trini@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).
buildman is best at building a series of commits at once. I suspect with just one commit its performance would be similar to MAKEALL. I use it to verify a series so that I know it will bisect correctly.
Has anyone given it a try? I have found one bug where it gets confused when a builder thread moved from one architecture to another. Apart from that I am thinking of cleaning up the series and submitting some proper patches. Any comments?
Regards, Simon
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