Alessandro Torrisi wrote:
IoThreadPoolFilter f = (IoThreadPoolFilter)
reg.getIoAcceptor(TransportType.SOCKET).getFilterChain().get("threadPool");
f.setMaximumPoolSize(10);
I discovered that this piece of code gives me "NullPointerException", I
have no FilterChain applied to the Acceptor and in my Eclipse debugger I
can see:
From what I can tell from the code you have included below you are
using MINA 0.9. As I explained in my previous mail the code above will
only work in MINA 0.8 (in 0.9 you will get an NPE since f will be null).
In MINA 0.9 you can try to to extend SimpleServiceRegistry instead as I
described earlier:
public class MyServiceRegistry extends SimpleServiceRegistry {
public MyServiceRegistry() {
super();
threadPoolFilter.setMaximumPoolSize(10);
}
}
Please note that the most important thing for scalability is that you
never perform any blocking operations in your IoHandler implementation.
Or at least make sure that they only block for a very short time. The
code samples you included do not give enough information on whether you
have any blocking operations.
...
I'm stopped ! I don't know where to look. I think there's too little
documentation or too few examples for Mina, I think more complex samples
are needed !
Regards, Alex
Yes, you may be right about that. But your open source DC server will be
an excellent example of a more complex MINA application. In the meantime
the MINA community is here to help you out.
BTW, is your open source project hosted somewhere publicly like on
sourceforge? If it is I could have a look if you want to.
/Niklas
Niklas Therning wrote:
No, the number of threads in your thread pool does not limit the
number of concurrent clients. That's actually one of the big benefits
of using MINA. Since everything is event based you can use a small
number of threads to handle a larger number of connections.
Please, try to set the max pool size to a small number (5-10 maybe)
and see if this has any impact on the performance.
/Niklas
Alessandro Torrisi wrote:
But in this way I will limit users max number in the hub server I
think...
Is there any way to have a significant increase of performance ?
Regards,
Alex.
Niklas Therning wrote:
Alessandro Torrisi wrote:
Hi ! I'm developing a free and opensource Direct Connect software
(P2P server). Now that protocol implementation is quite complete
I'm testing with lot of connections.
When connections are made in a concurrent way (50-100 a time), the
server seems to be blocked...
Can I do something to improve performance, adjusting some parameter
or applying some programming pattern directly on Mina ? I've
listened about Thread Pools on SocketAcceptor and IoThreadPool but
I didn't find any tutorial or documentation, is it possible to
directly configure these ones ?
Yes. By default the maximum thread pool size equals
Integer.MAX_VALUE. It can be changed but this has changed bewteen
MINA 0.8 and 0.9.
In 0.8, when using SimpleServiceRegistry, you can configure the
maximum pool size like this:
IoThreadPoolFilter f = (IoThreadPoolFilter)
reg.getIoAcceptor(TransportType.SOCKET).getFilterChain().get("threadPool");
f.setMaximumPoolSize(10);
In 0.9 its not that easy since the ThreadPoolFilter used by
SimpleServiceRegistry isn't accessible until a session has been
created. You could try to extend SimpleServiceRegistry and configure
the protected threadPoolFilter yourself:
public class MyServiceRegistry extends SimpleServiceRegistry {
public MyServiceRegistry() {
super();
threadPoolFilter.setMaximumPoolSize(10);
}
}
And then instead of using SimpleServiceRegistry you use
MyServiceRegistry.
Both of these approaches will use a thread pool of at most 10 threads.
HTH
/Niklas
