Elixir trick: start an Observer window with mix
Yesterday I wanted to monitor the processes that my Elixir application was spawning.
I knew there was something called
Observer, but couldn't remember exactly how to do it.
Taking a look at the doc, I found this debugging page that mentioned
The suggested usage was with
iex -S mix and then running
:observer.start() in the
mix shell manually.
I don't like manual things that much.
You can achieve the same, if you need to run your app with
mix run --no-halt in the following way:
mix run --no-halt --eval ":observer.start"
This will run your app (without halting) and spawn a process monitor window!
Alternatively, you can achieve the same using
iex --eval ":observer.start" -S mix
If you're interested, here the repo where I needed the process monitor:
As suggested by Aleksei on Twitter you could do something like to always, automatically start the observer window, and have
IEx functionality at the same time:
echo ':observer.start()' >> .iex.exs
Then, you can run your usual
iex -S mix and enjoy process monitoring!
Share on Twitter