Strange gitlab idea

Tom Rini trini at
Sun Aug 13 17:52:08 CEST 2023

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 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.

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