Ultra low latency in cluster application

[Trustin Lee]

Hi David,

I'm not sure, but a resource leak due to incorrect shared resource
usage is suspected.  Could you provide a simple application that
reproduces your problem?  Also, please try again with the latest trunk
snapshot to see if any fixes made since the last release helps it.

HTH,

— Trustin Lee, http://gleamynode.net/



On Wed, Feb 25, 2009 at 10:31 AM, dralves <davidralves at gmail.com> wrote:
>
> Hi
>  I'm currently  writing a cluster application that handles streams of data,
> and I'm using netty as the fw for async delivery. The application's data is
> very time sensitive so even though I need both latency and throughput if I
> have to choose I'll choose latency.
>  The application resides in a cluster of servers where each node accepts
> connections from multiples clients (not that many at this point, max 10
> clients) each message arrives is processed and then there is an independent
> (as in it might be to another machine), async reply. At first I started with
> the NIO sockets, witch held good thoughput but as latencies increased over
> time (reaching some whopping 60secs until i stopped the tests). Then I tried
> the Oio wich held also good thoughput but had lower latencies. Still the
> latency is increasing over time, slower but still increasing (27 secs at the
> moment of this post)(server machine under 100% cpu) and I have ran out of
> ideas.
> I flush the buffers on the client side every 10 messages (around 1500bytes)
> and have set tcp no delay to true.
> Can anyone help me?
> Best Regards
> David Alves
> --
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