On 10/15/2016 12:54 AM, Profpatsch wrote: > enableParallelBuilding is disabled by default, because it often > introduces non-deterministic build behaviour. > > How can I check whether the builds will behave nicely? > I think executing twice on the same system would often result > in quasi-deterministic behaviour. > Do we have CI automation in place that can detect stuff like that?
We have no automation for this. In general, you can perform a build again (--check as root). In my experience, parallel make problems tend to fail the build only and not produce a different output. Trying on an 8-thread-capable machine that's otherwise idle tends to be a relatively reliable way to tell, I believe. > What are general hints to whether stuff might be (non)deterministic? > > We should als document why parallel building is disabled by default. There wasn't a perfect consensus on that, actually. For example, I personally think we could have `build-cores = 0` by default, as we only leave enableParallelBuilding = true for packages that don't fail because of it. --Vladimir
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