[erlang-questions] large Erlang clusters

Viktor Sovietov <>
Sat Aug 16 23:48:03 CEST 2008


Hi Serge

Well, in that experiment we still had some reserve, because we had used beam
that been patched to bypass TCP. With having really fast interconnect and no
expenses for often kernel calls, we can pay no no attention to background
load, but further growth of cluster would require a meddling to Erlang's
scalability mechanisms. 

Sincerely,

--Viktor


Serge Aleynikov-2 wrote:
> 
> I suppose that the problem with the max number of sockets is solved by 
> tweaking session limits (ulimit) and using kernel poll (+K true).
> 
> As I understand, in a 600 node cluster every node will maintain 
> connections to the rest 599 nodes, and send periodic pings.  So, that 
> pinging overhead would be something in the order of 10 events per second 
>   per node in this configuration.  While the number doesn't seem 
> intimidating I wonder if that overhead becomes noticeable in large 
> network configurations and if there are any other guidelines that help 
> architect such large network clusters to keep background load minimal.
> 
> Serge
> 
> 

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