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<  Erlang  ~  MAX TCP connections
narcissus
Posted: Wed Nov 28, 2007 6:40 am Reply with quote
Joined: 28 Nov 2007 Posts: 2
Hi All,
I am running an erlang program to connect to an ejabberd server on a local IP using a gen_tcp behaviour. Both the machines run on Linux Debian. The problem is that upon exceeding 1000 odd connections to the ejabberd server I get the following error:-
***************************
=ERROR REPORT==== 27-Nov-2007::16:52:53 ===
E(<0.7232.0>:ltc:319): Connection error [emfile]

** Reason for termination =
** emfile
** exited: emfile **

=INFO REPORT==== 27-Nov-2007::16:52:53 ===
I(<0.5209.0>:ltc:694): *****SOCKET CLOSED*****
***************************

I have set all the relevant parameters in the configuration script for ejabberd server as below:-
*************************
# To use more than 1024 connections, you will need to set environment variable ERL_M$
export ERL_MAX_PORTS=50000

# Maximum Number of Erlang Processes
export P=25000

# Kernel Polling: +K true
export K=true
*************************
Also I have started the erlang emulator (from where) the connections are being made to the ejabberd server with parameters like "erl -s ejabberd -env ERL_MAX_PORTS 5000 +P 250000"
Q1) How can I get around this limitation ?
Q2) Is this a limitiation of the OS / erlang / ejabberd?


Any help in this regard will be appreciated..
cheers!
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nem
Posted: Thu Nov 29, 2007 12:25 pm Reply with quote
User Joined: 29 Nov 2007 Posts: 25
Hi there - I recently ran into this one while doing load testing with tsung.

Under recent debian distros there's a per process limit of 1024 file handles (and you need a file handle to open a tcp socket). (ulimit -n # the nofile limit).

I'm guessing ejabberd is running as some non-root user. You need to edit /etc/security/limits.conf and add a line like:

Code:

ejabberduser    -    nofile    65535


Which is roughly "Set the hard and soft nofile limits to 65535 descriptors for processes run by 'ejabberduser'".

The limits.conf file should have a number of comments describing how to tune the example above.

Cheers,
--nem
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narcissus
Posted: Fri Nov 30, 2007 12:03 pm Reply with quote
Joined: 28 Nov 2007 Posts: 2
hi there,
I am running the ejabberd as root. so is it still required to set the limit in "/etc/security/limits.conf" ??
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