Re: [PATCH v7 22/22] gitlab-ci: Support macOS 12 via cirrus-run

[Daniel P . Berrangé]

On Wed, Mar 09, 2022 at 12:58:42PM +0100, Thomas Huth wrote:
> On 09/03/2022 11.24, Philippe Mathieu-Daudé wrote:
> > Hi Alex, Thomas, Daniel,
> > 
> > Could you ack this patch?
>
> Basically fine for me, but can we really run additional cirrus-ci jobs by
> default? IIRC the parallel execution of those were quite limited for the
> free tier, so did you look close that we don't run into additional timeouts
> yet, due to delayed cirrus-ci jobs?

You can run 2 jobs in parallel in Cirrus. Beyond that they
get queued/serialized

We have a 1 hour job timeout.

We have to expect jobs will sometimes run slower than normal.

IOW if we have a job on Cirrus taking 30 minutes normally, we
expect it will sometimes take 45 minutes.

All this means that if we want Cirrus to be reliable and not
time out, we can really only have 2 jobs by default, unless
we can get the job execution time down to around 20 minutes
to allow for serialization.

We used to have terrible problems with cirrus timeouts when
we were running 4 jobs concurrently (2 on staging and 2 on
master). We addressed that in 9968de0a4a5470bd7b98dcd2fae5d5269908f16b
by disabling the jobs on master.

IOW, we really need to choose 1 macOS job and 1 FreeBSD job
and others need to be marked manual.

Regards,
Daniel
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