20,000 network connections per tcp server + max nodes

Joel Reymont <>
Sun Aug 28 21:39:29 CEST 2005

I apologize for a stupid post. A quick trip downstairs to talk to Ulf  
Wiger proved not only that my math is bad but that you could well fit  
within the 250 Erlang nodes limitation.

All I would need is to switch to UDP for the poker servers and figure  
out how many players I could support per node. Lets say I could  
support 50k or 100k. To save customers from having to write to my UDP  
protocol and to avoid potential problems (encrypted UDP on cell  
phones anyone?) I could front the UDP servers with a custom Linux box  
or few, tuned for network performance.

These boxes would maintain the 500k SSL connections and multiplex  
between the few Erlang UDP servers. Backend server crashes could also  
be transparent and not require player reconnects and the Linux  
proxies would just switch to a different UDP server.

Problem solved thanks to Uffe :-).


On Aug 28, 2005, at 8:26 PM, Joel Reymont wrote:

> I know we have been discussing this before but... Someone just  
> asked me a question of how much hardware would be required for my  
> poker cluster to support 500k simultaneous players.
> My understanding is that Erlang would max out with approximately  
> 250 nodes. This means that I need to support 20k players per node  
> and I really don't think that's possible.

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