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TCPMUX/Multiplexer for a chat server handling 100K clients, can anyone explain it to me?

Posted on 2011-04-23
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Last Modified: 2012-05-11
I am project managing a project that involves a high scalable chat server. It need to maximize the limitation of tcp connection/sockets to the server.

I know a single IRC server can handle a limited number of active connections. I have been told by implementing a multiplexer / tcpmux on top of the server. The limit can be increased.

Can somebody please explain it to me how this exactly works, I have been googling for more info for a few hours. But I cant find any practical showcases regarding to chat servers.

Thank you.
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Question by:Octalys
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Nopius earned 2000 total points
ID: 35457544
Hi.

Really TCPMUX has nothing to do with raising the number of connections. Really you have 2 choices.
You are about to go behind kernel limits and there is nothing to do with using some 'service'.
So there are not many choices:
1) You may use only one server host with tuned kernel (there are better OSes then Linux for handling so many users):
FreeBSD: http://rerepi.wordpress.com/2008/04/19/tuning-freebsd-sysoev-rit/
Solaris: http://lkml.indiana.edu/hypermail/linux/kernel/9909.3/0553.html
On Linux that's possible, but there are another restrictions (say if you use iptables with stateful rules "conntrack" - it is limited to 64K entries). A must tuning:
sysctl net.ipv4.tcp_tw_recycle=1                                                                            
sysctl net.ipv4.tcp_tw_reuse=1                        
sysctl net.ipv4.tcp_orphan_retries=1
echo "104854" > /proc/sys/fs/file-max
More info (a bit outdated): http://www.kegel.com/c10k.html

2) You may setup many servers with a load balancing DNS server ( http://en.wikipedia.org/wiki/Load_balancing_%28computing%29 )
3) You may setup 1 TCP load balancer + many backend servers say http://haproxy.1wt.eu/ or http://www.linuxvirtualserver.org/whatis.html

Every configuration should be tested before putting it in production.

Regards,
Arty


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