Solid Ground

Transcript

1. Solid ground @sasajuric aircloak.com

2. None

3. long-running system many tasks soft real-time finite time program all-or-nothing

   hard real-time

4. NIFs

5. scheduler scheduler scheduler scheduler BEAM CPU CPU CPU CPU

6. frequent context switches

7. t1 t2 t3 t4 t5 10 s 1 ms 1

   ms 1 ms 1 ms

8. t1 t2 t3 t4 t5 t1 BEAM scheduler

9. t2 t3 t4 t5 t1 cooperative scheduler

10. thread 1 thread n … long running task long running

    task blocked cooperative scheduler

11. thread 1 thread n … long running task long running

    task not blocked :-) BEAM scheduler

12. activities as runtime citizens

13. send(pid, :please_stop)

14. mref = Process.monitor(pid) send(pid, :please_stop) receive do {:DOWN, ^mref, :process,

    ^pid, _reason} -> :ok end

15. mref = Process.monitor(pid) send(pid, :please_stop) receive do {:DOWN, ^mref, :process,

    ^pid, _reason} -> :ok after :timer.seconds(5) -> Process.exit(pid, :kill) receive do {:DOWN, ^mref, :process, ^pid, _reason} -> :ok end end

16. task = Task.async(fn -> ... end) case Task.yield(task, :timer.seconds(5)) do

    {:ok, result} -> do_something(result) nil -> Task.shutdown(task, :brutal_kill) end

17. shared-nothing concurrency

18. Process heap resources

19. process-owned “stuff” is released

20. supervision tree

21. system backend frontend chat history repo cache endpoint

22. system backend chat history repo

23. supervisor foundations frequent context switching activities as runtime citizens observable

    process termination stoppable processes shared-nothing concurrency

24. runtime 
 guarantees syntax developer friendliness ecosystem

25. Image credit Scales of Justice