Slow writes from outside an I/O-worker?

[Norman Maurer]

Im almost sure thats because of this:

 future.awaitUninterruptibly();

This will give you some overhead...

bye
norman

Am Mittwoch, 21. September 2011 schrieb ArvidSvensson <
arvid.svensson at gmail.com>:
> Hi there,
> I'm trying to burst data from a server to a clients and I can't get any
> speed out of Netty's NIO channel.
>
> If I do the following with a *Nio*ServerSocketChannelFactory I get poor
> performance. The profiler tells me Channel#write eats CPU and I only get
> ~20k messages/s @ ~20 bytes each to the client. I get ~20k both over
network
> and localhost loop-back. If I do the same with a
> *Oio*ServerSocketChannelFactory I roughly double to ~40k messages/s over
> network and well above 100k messages/s on localhost loop-back.
>
> while (true) {
>    Object message = nextMessage();
>    ChannelFuture future = channel.write(message); // call write from
> non-I/O worker.
>    future.awaitUninterruptibly();
> }
>
>
> If I do the following with a *Oio*ServerSocketChannelFactory it hangs. If
I
> do it with *Nio*ServerSocketChannelFactory I almost match the ~40k
> messages/s.
>
> Object message = nextMessage();
> ChannelFuture future = channel.write(message); // call write from non-I/O
> worker.
> future.addListener(new ChannelFutureListener() {
>    public void operationComplete(ChannelFuture future) {
>         Object message = nextMessage();
>         channel.write(message).addListener(this); // call write from I/O
> worker.
>    }
> });
>
> Why is it so expensive to call (NIO) Channel#write from a non-I/O worker?
>
> If I have the next message available when the previous future signals
> operationComplete everything is fine since I can call write on the
> I/O-worker. However, If I miss that moment I'm forced to write to the
> channel from a non-I/O worker again takin a bit hit.
>
> --
> View this message in context:
http://netty-forums-and-mailing-lists.685743.n2.nabble.com/Slow-writes-from-outside-an-I-O-worker-tp6817213p6817213.html
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