MT breaks Lint/Typos rule

[Sija]

When ameba is built with -Dpreview_mt, the Rule::Lint::Typos rule hangs indefinitely while calling Process.run .

[straight-shoota]

Any idea why this is happening? I would consider #474 a useful workaround. But it's really odd that this fails. Spawning processes should work in a MT environment just fine.

[Sija]

@straight-shoota Dunno but it could be a bug on the typos-side of things.

[straight-shoota]

When spawning a external processes, the effect of multi-threading shouldn't be much different from single-threaded concurrency. Even within a single thread, multiple processes and be started concurrently and run in parallel.

It might be interesting to observe how many processes run in parallel.

[Sija]

@straight-shoota each file (source) is being run in a separate fiber, so in approximation there should be as much of 'em as the number of crystal source files in the repo. I remember having this issue in multiple repos, not just this one.

[straight-shoota]

Oh, that's a lot then. If they all spawn processes concurrently that can lead to a lot of processes running in parallel. Might be worth to consider some throttling, like running only a hand full of worker fibers per thread.