Strange gitlab idea

[Tom Rini]

On Sat, Aug 12, 2023 at 09:14:45PM -0600, Simon Glass wrote:

> Hi Tom,
> 
> I notice that the runners are not utilised much by the QEMU jobs,
> since we only run one at a time.
> 
> I wonder if we could improve this, perhaps by using a different tag
> for the QEMU ones and then having a machine that only runs those (and
> runs 40 in parallel)?
> 
> In general our use of the runners seems a bit primitive, since the
> main use of parallelism is in the world builds.

I'm honestly not sure. I think there's a few tweaks that we should do,
like putting the opensbi and coreboot files in to the Dockerfile logic
instead.  And maybe seeing if just like we can have a docker registry
cache, if we can setup local pypi cache too?  I'm not otherwise sure
what's taking 23 seconds or so of
https://source.denx.de/u-boot/u-boot/-/jobs/673565#L34 since the build
and run parts aren't much.

My first big worry about running 2 or 3 qemu jobs at the same time on a
host is that any wins get from a shorter queue will be lost to buildman
doing "make -j$(nproc)" 2 or 3 times at once and so we build slower.

My second big worry is that getting the right tags on runners will be a
little tricky.

My third big worry (but this is something you can test easy enough at
least) is that running the big sandbox tests, 2 or 3 times at once on
the same host will get much slower. I think, but profiling would be
helpful, that those get slow due to I/O and not CPU.

-- 
Tom
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