How to release the GVL?

[KMarshland]

Is there a way to release the GVL/GIL? I saw in #12 that it wasn't in Magnus yet, but that was 2.5 years ago.

For reference, my use case is doing some extremely CPU intensive processing based on a filename, so no need to go back and forth with ruby objects. In principle I could handle this via a popen3 to a binary, but I quite like the ergonomics of using Magnus.

[matsadler]

Magnus' original API wasn't compatible with (safely) implementing a function to release the GVL. It's been a slow process designing and then migrating functions from the old api design to one that will be able to support a safe implementation of releasing the GVL, so as yet there isn't the functionality built in to Magnus.

It is possible to implement it yourself via rb-sys, and I think if you do a web search you'll find a couple of people who have done this.

[KMarshland]

Thanks! As you said "as yet", I take it that it's in the roadmap? Awesome to hear (and thank you for your hard work on this library).

For others coming across this thread, the main thing I found here was https://github.com/Maaarcocr/lucchetto, though I don't use it myself (opting instead for spawning new processes).

[ilyazub]

Wasmtime have it's own nogvl which may be used as an example: https://github.com/bytecodealliance/wasmtime-rb/blob/main/ext/src/helpers/nogvl.rs#L17-L29