# Multicore OCaml: September 2021, effect handlers will be in OCaml 5.0!

**URL:** <https://discuss.ocaml.org/t/multicore-ocaml-september-2021-effect-handlers-will-be-in-ocaml-5-0/8554>\
**Category:** Community\
**Tags:** multicore, multicore-monthly\
**Created:** [October 1, 2021, 1:33pm UTC](https://discuss.ocaml.org/t/multicore-ocaml-september-2021-effect-handlers-will-be-in-ocaml-5-0/8554 "2021-10-01T13:33:12Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![avsm](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/avsm/32/6_2.png) [@avsm](https://discuss.ocaml.org/u/avsm)\
**Post date:** [October 2, 2021, 10:40am UTC](https://discuss.ocaml.org/t/multicore-ocaml-september-2021-effect-handlers-will-be-in-ocaml-5-0/8554/9 "2021-10-02T10:40:16Z")

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> [@sid](#):
>
> What is the upcoming OCaml debugging story? Firing up the native executable and debugging using gdb/rr is going to be difficult because all you will see is low level stuff.

We’ve gone to some effort to preserve DWARF unwinding correctly in multicore OCaml (see [the effects paper](https://anil.recoil.org/papers/2021-pldi-retroeff.pdf) for more details). You may also want to check the [debugging tips and tricks](https://github.com/ocaml-multicore/ocaml-multicore/wiki/Debugging-the-OCaml-Multicore-runtime) in the OCaml multicore wiki which has info on how to use gdb and rr. You do get your functions back as mangled names, but it’s pretty easy to visually map those back to their original OCaml function names by inspection.

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