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

[Daniel P . Berrangé]

On Wed, Jan 06, 2021 at 11:41:59AM +0000, Daniel P. Berrangé wrote:
> 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.

It appears I might be mistaken here. On IRC it was reported that
going back furrther to v5.1.0 shows good performance in Cirrus
still.

I had only gone back as far as 2a5a79d1b57280edd72193f6031de3feb682154e
which I thought was fast originally.

So somewhere between v5.1.0 and 2a5a79 we apparently regressed.

Regards,
Daniel
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