Can't open more than ~200 outgoing for a single thread? mac os big sur 11.2 intel

[Ashton Kinslow]

Hello,

2021/03/12 19:19:32 CLIENT 2524 had error connecting to the broker: Network Error : dial tcp mymqttip:1883: socket: too many open files

Tryin to run with 10k connections and i start to get this pretty quick, any ideas what I need to do ?

running on mac os big sur 11.2

[Alexandr Krylovskiy]

Hey @ashtonian looks like you are hitting the OS limit on open files. Try changing the limit with ulimit e.g. ulimit -n 10240.

[Ashton Kinslow]

Thank you! That seems to have helped substantially! Now it seems to get up to 10k connections before it'll start erroring out, this time with i/on timeouts which I'm assuming are more about bandwidth.