Speed up the CI?

[martincostello]

Since we introduced mutation testing I've noticed that the build time has increased significantly compared to the few minutes it took previously to now run in about 25 minutes.

Is there a way we can improve the time the mutation tests take to run? I've not used it myself before, so I'm not familiar with whether or not ~20 minutes to run the tests for a codebase the size of Polly's is expected/normal.

If it's just a fact of life with the use of this approach that's fine, but if there's something we can do to speed it up that would be good.

[martintmk]

@martincostello
The mutation testing takes a long time. In our code-base we have some tricks to only run mutation tests on affected projects (otherwise our runs could take > 5 hours).

The problem is that infrastructure is internal and would be hard to replicate here. There are plans to make it public so we can use it once it's available.

[github-actions]

This issue is stale because it has been open for 60 days with no activity. It will be automatically closed in 14 days if no further updates are made.

[martincostello]

Let's consider this resolved by #1151, #1354 and #1369.