[ejabberd] How to handle more than 30000 mobile connections on one EC2 large instance ?

Pablo Polvorin pablo.polvorin at process-one.net
Tue Sep 28 21:30:48 MSD 2010


Hi Vincent,
why do you have kernel poll disabled?,  it is some EC2 restriction?
it won't make a difference if you have few connections, but at  > 10k
clients that
starts to count.



On 28 September 2010 14:09, Vincent Barat <vbarat at ubikod.com> wrote:
> Hi everybody,
>
> We are running 2 eJbaberd 2.1.0 servers on one EC2, large instances (8 GB
> RAM). These 2 servers handle nearly 25000 XMPP connections from mobile
> devices.
>
> Because we handle mobile device connections, we face the following issue:
> the servers open and close a LOT of connection each second (from 10 to 20)
> because connections are not stable. When we start to reach 20000
> simultaneously connected users, the time eJabberd take to open the incoming
> C2S socket increase until 50s. (i.e. 50s to see this first damned <stream>
> stanza  !). Once the socket has been opened, the signin process itself is
> fast.
>
> What is interesting to note: the EC2 instance itself is not slow, and
> opening any other incoming socket (e.g. SSH) is FAST.
>
> So the question is: do you know how to improve the time needed by eJabberd
> to ACCEPT an incoming connection ?
>
> My configuration:
>
> Mnesia (I don't think that using SQL would improve, since we don't have any
> roster, but I need some advice here...
>
> All standard modules have been deactivated. Here is our typical .cfg file:
> {modules,
>  [
>  {mod_adhoc,    []},
>  {mod_configure,[]},
>  {mod_disco,    []},
>  {mod_version,  []}
> ]}.
>
> We are using  Erlang R13B04 (erts-5.7.5) [source] [64-bit] [smp:2:2] [rq:2]
> [async-threads:0] [kernel-poll:false]
>
> Thanks for your help
>
>
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>



-- 
Pablo Polvorin
ProcessOne


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