Solid Ground

Transcript

1. 1.

   Solid ground @sasajuric aircloak.com

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   None
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   long-running system many tasks soft real-time finite time program all-or-nothing

   hard real-time
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   NIFs

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   scheduler scheduler scheduler scheduler BEAM CPU CPU CPU CPU

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   frequent context switches

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   t1 t2 t3 t4 t5 10 s 1 ms 1

   ms 1 ms 1 ms
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   t1 t2 t3 t4 t5 t1 BEAM scheduler

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   t2 t3 t4 t5 t1 cooperative scheduler

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    thread 1 thread n … long running task long running

    task blocked cooperative scheduler
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    thread 1 thread n … long running task long running

    task not blocked :-) BEAM scheduler
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    activities as runtime citizens

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    send(pid, :please_stop)

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

    ^pid, _reason} -> :ok end
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    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
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    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
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    shared-nothing concurrency

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    Process heap resources

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    process-owned “stuff” is released

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    supervision tree

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    system backend frontend chat history repo cache endpoint

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    system backend chat history repo

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    supervisor foundations frequent context switching activities as runtime citizens observable

    process termination stoppable processes shared-nothing concurrency
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    runtime 
 guarantees syntax developer friendliness ecosystem

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    Image credit Scales of Justice