CODEWITHSUNDEEP
javascriptnode.jswebsocket
newguy
newguy

Reputation: 5976

How can I increase the maximum number of websocket connections on my local machine?

I am writing a game using websocket with ws module and I try to create some virtual websocket connections on my local computer to test it. However when I created more than 250 connections it gives an error: 

 throw er; // Unhandled 'error' event
      ^

Error: connect ECONNRESET 127.0.0.1:9999
    at Object.exports._errnoException (util.js:1014:11)
    at exports._exceptionWithHostPort (util.js:1037:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1138:14)

How to remove this error and get more connections for testing? I don't get the error when the connection number is in the range of 1 - 210. But over 210 sometimes I get this error and if the connection number is over 250 I always get this error. I am not sure what causes this error. Is it because my computer is not capable of handling so many local connections? I am using OSX Yosemite (10.10.5)

Upvotes: 1

Views: 1119

Answers (1)

newguy
newguy

Reputation: 5976

Just found out this:

Increase TCP max connections on OSX

The reason is that the max open files number is limited in OSX Yosemite. I just need to change the max open files number and the max connection number.

I will put the commands from the above link here:

increate max open files

$ sysctl -a | grep files
kern.maxfiles = 12288
kern.maxfilesperproc = 10240

kern.maxfiles and kern.maxfilesperproc were small numbers, they need to be increased:

$ sudo sysctl -w kern.maxfiles=12288
$ sudo sysctl -w kern.maxfilesperproc=10240

after this, you can increase your account’s limit by ulimit -n:

$ ulimit -n 10240

increate max sockets

$ sysctl -a | grep somax
kern.ipc.somaxconn: 2048

It was a small number and need to be increased:

$ sudo sysctl -w kern.ipc.somaxconn=2048

Upvotes: 1

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