Set the number of processes limit for the erlang runtime?

[Lilja]

I got inspired by this blog post and wanted to write my own in gleam, I ended up writing this:

import gleam/list
import gleam/yielder
import gleam/erlang/process
import gleam/otp/task

const timeout = 600_000

fn work() {
     yielder.range(1, 10_000_000)
    |> yielder.to_list()
    |> list.map(fn(_) { task.async(fn() { process.sleep(10000) }) })
}

pub fn main() {
    let w = work()
    task.try_await_all(w, timeout)
}

And ran it:

$ gleam run -t erlang -m memory
   Compiled in 0.02s
    Running memory.main
runtime error: Erlang error

An error occurred outside of Gleam.

erlang:error(SystemLimit)

stacktrace:
  erlang.spawn_link unknown source
  erlang.spawn_link unknown source
  gleam/otp/task.async /Users/lilja/code/experiments/memory/build/packages/gleam_otp/src/gleam/otp/task.gleam:60
  gleam/list.map_loop /Users/lilja/code/experiments/memory/build/packages/gleam_stdlib/src/gleam/list.gleam:391
  memory.main /Users/lilja/code/experiments/memory/src/memory.gleam:17

=ERROR REPORT==== 29-Nov-2024::13:08:59.217854 ===
Too many processes

Is there a way to increase the process limit? Google seems to suggest settings some "+P" flag. But that's for the erlang runtime?

[lpil]

That's right! +P is what you want. You can configure the VM using its environment variables such as ERL_FLAGS. https://www.erlang.org/doc/apps/erts/erl_cmd.html