Question about a server that opens multiple SocketAcceptors

[Paul Chen <ch...@gmail.com>]

Hi, folks,

I have a server with multiple SocketAcceptors listening on 5 different
socket ports. And I create 5 acceptors the following way.

-----
 int NUMBER_CPU = Runtime.getRuntime().availableProcessors();
 Executor ioExecutor = Executors.newFixedThreadPool(NUMBER_POOL_THREADS);
 SocketAcceptor acceptor = new SocketAcceptor(NUMBER_CPU, ioExecutor);
 ...
 acceptor.bind(...);
-----

Repeating the above statement 5 times.

But my machine has only 2 CPUs (NUMBER_CPU=2). Before I dive into
serious performance experiments, I'd love to learn from you guys
what's the best or recommended parameters to new the SocketAcceptors
in this situation?

Thanks a bunch

Paul

Re: Question about a server that opens multiple SocketAcceptors

[Trustin Lee <tr...@gmail.com>]

Hi Paul,

On 2/16/07, Paul Chen <ch...@gmail.com> wrote:
> Hi, folks,
>
> I have a server with multiple SocketAcceptors listening on 5 different
> socket ports. And I create 5 acceptors the following way.
>
> -----
>  int NUMBER_CPU = Runtime.getRuntime().availableProcessors();
>  Executor ioExecutor = Executors.newFixedThreadPool(NUMBER_POOL_THREADS);
>  SocketAcceptor acceptor = new SocketAcceptor(NUMBER_CPU, ioExecutor);
>  ...
>  acceptor.bind(...);
> -----
>
> Repeating the above statement 5 times.
>
> But my machine has only 2 CPUs (NUMBER_CPU=2). Before I dive into
> serious performance experiments, I'd love to learn from you guys
> what's the best or recommended parameters to new the SocketAcceptors
> in this situation?

Repeating the above statements 5 times means that the number of
required threads is (2 + 1) * 5.  Please refer to the following
document for detailed information on configuring the thread model.

http://mina.apache.org/configuring-thread-model.html

For the situation you are facing, I recommend you

1) to create only one acceptor and bind many times.
2) not to share one thread pool with the acceptor and the
ExecutorFilter.  If you really want to do that, please don't use a
fixed thread pool.

HTH,
Trustin
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