cppcms-users

[Cppcms-users] Chat example runs slowly after the change

[<cn...@gr...>]

Hi!


I am trying to get the rationale of  cppCMS.


I modified the "chat" example as follows but the system then runs very slowly. My browser does not echo the first message in 8 seconds. And since it doesn't echo the second message in minutes, so I killed the server. Both the server and browser run in the same host. Can it be a problem in chat.cpp or the script in the_chat.html?


-----------


int main(int argc,char **argv)

{
    try {
        cppcms::service service(argc,argv);

  /*

          booster::intrusive_ptr<chat> c=new chat(service);

          service.applications_pool().mount(c);
  */

                service.applications_pool().mount(cppcms::applications_factory<chat>()); //slow!
  service.run();

    }
    catch(std::exception const &e) {
        std::cerr<<"Catched exception: "<<e.what()<<std::endl;
        return 1;
    }
    return 0;
}

---------
Regards,
CN

Re: [Cppcms-users] Chat example runs slowly after the change

[Artyom <art...@ya...>]

>
>        service.applications_pool().mount(cppcms::applications_factory<chat>()); 
>


You should use asynchronous application for handing COMET request. This would
not work as it should not. Asynchronous applications mounted directly
by their instance rather then using factory class.

Unlike ordinary applications that created by some factory class and may
have several instances in pool, asynchronous one have single
instance in order to handle all incoming multiple request. 

See <http://art-blog.no-ip.info/cppcms/blog/post/47>

>
Artyom


      

Re: [Cppcms-users] Chat example runs slowly after the change

[<jc...@ol...>]

Hello,
> See <http://art-blog.no-ip.info/cppcms/blog/post/47>

Fine setup!
Let's assume  that I am using nginx with one backend of ten processes.
That means, my webserver can handle ten processes at a time and that if an
eleventh request arrive, its execution will be delayed.  There is no way
to increase the number of backend nor the number of processes.
With the above setup, let's say that ten requests are waiting for some
messages; an eleventh request will be delayed... Is there a way around
that jam?

Thanks!



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> Artyom
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Re: [Cppcms-users] Chat example runs slowly after the change

[Artyom <art...@ya...>]

> Let's assume  that I am using nginx with one backend of ten  processes.
> That means, my webserver can handle ten processes at a time and  that if an
> eleventh request arrive, its execution will be delayed.


This is not correct. Web server forwards all requests directly
to the cppcms process even if it is a single one (and in asynchronous
applications you do have a single process)

So all 11 request will be forwarded without any delay or jam. Single
cppcms process can handle lots of requests simultaneously.

Artyom