ms68
What is the indication of async-threads when starting iex?
I couldn’t found anything on the web. I have 8 cores on my machine
and when I launch iex, it prints out async-threads:1
Is there a way to manually increase it?
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NobbZ
That’s a setting related to your Erlang installation, can you please show the full headline and tell us what operating system you are using as well as how you installed Erlang and elixir?
ms68
Erlang/OTP 21 [erts-10.0] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe]
Interactive Elixir (1.6.6) - press Ctrl+C to exit (type h() ENTER for help)
I am using ubuntu 18.04 and I installed erlang and elixir following the offcial docs. I have found a way to increase it by passing --erl “+A number_of_threads” to iex. But I’m still confused about the limitation. How many async_threads is normal for an 8 core cpu?
NobbZ
You have 8 schedulers online, so you can use the full power of your CPU.
async-threadsis mostly for IO related stuff as I understood it.You can read more on SO:
michalmuskala
Since OTP 21 none of the built-in things use async threads (they migrated to dirty schedulers and dirty NIFs), so it doesn’t make much sense to spawn those threads. There’s still one of them in case you have some custom linked-in port drivers using them.
On previous versions the file ports were using async threads.
ms68
That’s what I’m trying to do. I want to to run about 20000 System.cmd concurrently. Is there any use in increasing async_threads? If yes, how can I calculate what is the appropriate number based on my cpu cores?
dom
System.cmd spawns external processes. They don’t run inside the Erlang VM, so they don’t use async threads.
ms68
Do you have any suggestion?
ms68
What I am trying to do with System.cmd is running an I/O bound operation (snmp request). Do you think if I use an snmp library written in erlang/elixir, I will achieve better concurrency?
dom
Possibly, but what problem are you hitting exactly?
ms68
Concurrency. I will get lots emfile errors after spawning 20000 System.cmd functions.