ocaml-multicore/meio

Monitor Eio programs

OCaml

89

72 commits

updated Jun 4, 2026

See the code

README

meio

Status: Experimental

Meio is a CLI tool for monitoring programs using Eio. It allows you to see, in real-time, the running and idle fibers of your program along with the structure of the fiber tree. Fibers are also labelled with where they were spawned from and each individual fiber carries extra information about how busy it is, how often it is entered and the debug logs that have been run from the fiber. Here's what Meio looks like:

Meio on asciicast

Building meio

Meio uses custom events which will be available in OCaml 5.1. This means currently you must use a few forked libraries.

To build Meio locally:

$ opam switch create . 5.1.0~rc1 --no-install
$ opam install --deps-only .
$ dune build

You can install meio with dune install ./meio.opam and then run one of the example programs from Meio.

$ meio _build/default/example/burn.exe
console
terminal

Contributors

patricoferris

60 commits

tmcgilchrist

8 commits

MisterDA

1 commits

ocaml-multicore/meio

Monitor Eio programs

OCaml

89

72 commits

updated Jun 4, 2026

See the code

README

meio

Status: Experimental

Meio is a CLI tool for monitoring programs using Eio. It allows you to see, in real-time, the running and idle fibers of your program along with the structure of the fiber tree. Fibers are also labelled with where they were spawned from and each individual fiber carries extra information about how busy it is, how often it is entered and the debug logs that have been run from the fiber. Here's what Meio looks like:

Meio on asciicast

Building meio

Meio uses custom events which will be available in OCaml 5.1. This means currently you must use a few forked libraries.

To build Meio locally:

$ opam switch create . 5.1.0~rc1 --no-install
$ opam install --deps-only .
$ dune build

You can install meio with dune install ./meio.opam and then run one of the example programs from Meio.

$ meio _build/default/example/burn.exe
console
terminal

Contributors

patricoferris

60 commits

tmcgilchrist

8 commits

MisterDA

1 commits

Languages

OCaml

97.6%

Dockerfile

1.3%