[Twisted-Python] Multi-reactor architecture

[vitaly at synapticvision.com]

thank you for such detailed response.
I feel, finally I've succeed to express my original question correctly.

So if I go one step forward, and lets assume that indeed there is such  
limit of concurrent connections, THAN:
should it be resolved by another architecture or another usage type of  
Twisted technology or something else?



Quoting "Reza Lotun" <rlotun at gmail.com>:

>> Once there is a Site that serving many clients and
>> reactor.listenSSL(), for example, that actually serving many TCP
>> connections and all these going through TwistedGateway, my logic,
>> please correct me if I wrong, says at some point there will be a limit
>> on concurrent TCP connections, so how is it solved with Twisted?
>
> That's a good question and I'm not sure if there's a definite answer
> to this (as far as I know). I think it depends on your application -
> for example, if your server is performing a big computation then on
> average client connections will last longer, meaning you'll have more
> concurrent connections.
>
> The best way to determine this is to *measure* it - for example, you
> can do a load test with httperf and ramp up connections until this
> start to break or become unresponsive.
>
> You can mitigate the situation by tuning your platform a bit (assuming
> you're using linux)
> - use the epoll reactor, which is high performance
> - make sure the number of open file descriptors is set to something
> high (and *not* 1024) - see `ulimit -a`
> - make sure you tune your tcp settings - see /etc/sysctl.conf, namely
> fs.file-max and various net.ipv4 settings (google is your friend on
> the best settings, coupled with testing)
>
> Cheers,
> Reza
>
> --
> Reza Lotun
> mobile: +44 (0)7521 310 763
> email:  rlotun at gmail.com
> work:   reza at tweetdeck.com
> twitter: @rlotun
>
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