Use parallel build in CI

[wusatosi]

The GitHub Actions runner has 4 cores, parallel build should speed up the build process.

Unfortunately, there's not a portable way to add this in preset, see: here.

[neatudarius]

What's the new duration? (old vs new)

[steve-downey]

The explicit command is fine here, but for completeness:

                   The CMAKE_BUILD_PARALLEL_LEVEL environment variable
                   specifies a default parallel level when this option
                   is not given.

for cases where the cmake command may be indirectly used.

[dietmarkuehl]

Silly question on the CI: is there a way to run the CI (or parts thereof if things depened on the OS) locally?

[neatudarius]

Can we do parallel jobs ? e.g. Build Release || Build Debug

[wusatosi]

The only way to run these in parallel is to separate them into multiple jobs. This would bring speedup but it would make number of checks double.

[wusatosi]

What's the new duration? (old vs new)

The speedup won't be observed here in exemplar. This is more for downstream libraries.

[wusatosi]

Silly question on the CI: is there a way to run the CI (or parts thereof if things depened on the OS) locally?

Unfortunately GitHub Action is notoriously not testable, there's no officially supported execution engine, but Ack is a community maintained implementation that allows you to run the pipeline locally.

[steve-downey]

Silly question on the CI: is there a way to run the CI (or parts thereof if things depened on the OS) locally?

Not easily, unfortunately. I've had some success with https://github.com/nektos/act and when it works it works fine, but it's a bit tricky to get working. That's the same as the project that @wusatosi mentioned.

[wusatosi]

Not easily, unfortunately. I've had some success with https://github.com/nektos/act and when it works it works fine, but it's a bit tricky to get working. That's the same as the project that @wusatosi mentioned.

Yeah I personally find creating a branch and putting up debugging commits to be, ironically, the easiest approach.

[dietmarkuehl]

Thanks for the pointer to ACT: I'll have a look. My objevtive isn't to test the CI bit rather to test the code, assuming the CI works. I'll see how that goes.