Sudden performance drop

[Jamie McCrindle]

It definitely sounds like there are resources that you're accumulating and
not letting go. Also, it could be an operating system issue where you're
exhausting the number of sockets available. Other things to try:

find out how many sockets are open and what state they're in: netstat -a
attach visual vm and do a heap dump and see if you can spot an overabundance
of any resources: http://visualvm.java.net/
post the relevant code on this list and someone here might spot something
interesting

oh, also, if you're using an execution handler with a memory aware thread
pool executor (or ordered memory aware one), and you're running out of
threads or memory, the execution handler will pause the netty IO thread,
which will slow things down some.

cheers,
j.

On Thu, Oct 20, 2011 at 6:55 PM, philmes <phil at digitalcontortions.net>wrote:

> That's one of the things I've checked. I'd expect GC pauses to be
> temporary,
> but a quick check with a profiler shows memory usage to be stable and
> negligible GC occurring anyway.
>
> thanks,
>
> Phil.
>
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