Too many open files, crash when serving static files.

[skunkworker]

When running a stress test against the example hello world app I got it to crash when trying to hit /index.html

wrk -d 20 -t 4 -c 1015 http://0.0.0.0:4000/index.html

Params: =index.html
accept: Too many open files (Errno)
0x10defddc5: *CallStack::new:CallStack at ??
0x10df00a6e: *raise<Errno>:NoReturn at ??
0x10dfbb065: *Amber::Server#start:Nil at ??
0x10defbfa2: __crystal_main at ??
0x10df24bdb: main at ??

I'm thinking it could be an open file descriptor issue or something else, but I'll look into see if its a crystal-lang bug or something that we can tackle.
Possibly related - crystal-lang/crystal#780

[skunkworker]

I may have been running into 10.11's ulimit limit of only 256 open file descriptors.
https://blog.dekstroza.io/ulimit-shenanigans-on-osx-el-capitan/

[elorest]

Yeah thats definitely it. With that error. You have to change your ulimit.

…

On Jun 11, 2017 1:58 AM, "John Bolliger" ***@***.***> wrote: I may have been running into 10.11's ulimit limit of only 256 open file descriptors. https://blog.dekstroza.io/ulimit-shenanigans-on-osx-el-capitan/ — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#108 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAHmpE9qCKLu_D0dFzo0JYKqgjMHefPUks5sC54qgaJpZM4N2Uq_> .

[eliasjpr]

Is this still a valid issue. It looks like is more a server config issue. LMK

[akzhan]

It's invalid. wrk ran with 1015 of HTTP connections to keep open with each thread and with 4 threads.

So I suppose that 4K connections may be established sometimes. You need approx. limit of 8K+ of descriptor (4K connections and 4K handles to static files).

https://stackoverflow.com/questions/880557/socket-accept-too-many-open-files

[drujensen]

closing this issue.