Re: [boost] Boost Asio on multi processor environment

From: Gaurav.Jain_at_[hidden]
Date: 2007-05-02 08:48:41

Hi,

Christopher Kohlhoff <chris <at> kohlhoff.com> writes:

> I'm sure I've outlined this in another email somewhere, but I can't
find
> it right now. Anyway, the basic idea is as follows:
> 
> - Create an io_service for each CPU.
> 
> - Create an io_service::work object for each io_service to keep it
> running when it would otherwise have nothing else to do.
> - Spawn a thread for each io_service to call io_service::run().

> - Create a tcp::acceptor on one of the io_services.
> 
> - Create your tcp::socket objects on any of the io_services, using
some
> sort of load balancing scheme to choose the io_service to use (e.g.
> round robin).
> 
> - Ensure that all communication between io_services uses message
> passing, i.e. use io_service::post().
> 
> The core of the work would probably happen in a handle_accept
> function(), e.g. using the Daytime.3 tutorial program as a starting
> point:
> 
>   void start_accept()
>   {
>      // ------> Load balance here <------
>     tcp_connection::pointer new_connection =
>       tcp_connection::create(choose_io_service());
> 
>     acceptor_.async_accept(new_connection->socket(),
>         boost::bind(&tcp_server::handle_accept, this, new_connection,
>           asio::placeholders::error));
>   }
> 
>   void handle_accept(tcp_connection::pointer new_connection,
>       const asio::error_code& error)
>   {
>     if (!error)
>     {
>       // ------> Use message passing here <------
>       new_connection->socket().io_service().post(
>          boost::bind(&tcp_connection::start, new_connection));
> 
>       start_accept();
>     }
>   }

Chris in one of your replies I get to know that to achieve the above one
can use a pool of io service object. Could you explain a bit about this?
What is this io service::work object. How I can use thread pool in
achieving the above? What should I have in my worker object structure of
the thread pool?

Regards
Gaurav 

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