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Re: [PATCH] cirrus: don't run full qtest on macOS

From: Alex Bennée
Subject: Re: [PATCH] cirrus: don't run full qtest on macOS
Date: Wed, 06 Jan 2021 13:51:11 +0000
User-agent: mu4e 1.5.7; emacs 28.0.50

Daniel P. Berrangé <berrange@redhat.com> writes:

> The Cirrus CI macOS build hosts have exhibited a serious performance
> degradation in recent months. For example the "qom-test" qtest takes
> over an hour for only the qemu-system-aarch64 binary. This is as much
> 20-40 times slower than other environments. The other qtests all show
> similar performance degradation, as do many of the unit tests.
> This does not appear related to QEMU code changes, since older git
> commits which were known to fully complete in less than 1 hour on
> Cirrus CI now also show similar bad performance. Either Cirrus CI
> performance has degraded, or an change in its environment has exposed
> a latent bug widely affecting all of QEMU. Debugging the qom-test
> showed no easily identified large bottleneck - every step of the
> test execution was simply slower.
> macOS builds/tests run outside Cirrus CI show normal performance.
> With an inability to identify any obvious problem, the only viable
> way to get a reliably completing Cirrus CI macOS job is to cut out
> almost all of the qtests. We choose to run the x86_64 target only,
> since that has very few machine types and thus is least badly
> impacted in the qom-test execution.
> With this change, the macOS jobs complete in approx 35 minutes.
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

Queued to testing/next, thanks.

Alex Bennée

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