Re: [Asterisk-java-users] Advanced Event Filtering

[Aaron E. <aar...@gm...>]

As a general rule, I try to keep my swap at 0 always. Swap is very
bad, not just for java. :D

On 8/2/07, Brett Sutton <bs...@no...> wrote:
> I would be very surprised if you have any problems with the garbage
> collector.
>
> We have done a lot of work in this area for a large client running a
> very heavily loaded java based web server (tomcat).
> The garbage collector is super fast.
>
> The only problem we ever had was if we let the java app swap memory out
> to the page file.
> This is super dangerous with java.
> [This took us about 6 weeks of heavy diagnosis to discover the root
> cause of, hence the experience with the java GC. This is the only bug
> that I've every resolved by 'touch'.  I happened to put my hand on the
> system unit during garbage collection and felt the drive rumbling :)]
>
> The Tenured area of the garbage collector can grow quite big and remain
> untouch for lengthy periods of time.
> The OS will then page this area out to disk. When a tenured garbage
> collection occurs the tenured area has to be pulled from disk. This can
> turn a GC which normally takes 300 milliseconds into a 2 minute process.
>
> Regards,
> Brett.
>
>
>
> Stefan Reuter wrote:
> > Hi,
> >
> > my first thought when reading this thread was: If it's not broken, don't
> > try to fix it. It seems you did not experience any problems with garbage
> > collection (though you might run some load tests to verify that in your
> > environment). Java is really smart handling small short-lived objects.
> > The garbage collector has a young generation (eden space) designed for
> > just that purpose.
> >
> > The next thing that comes to my mind is what you might actually achieve
> > by filtering events at the java side. You will still have create some
> > strings and build the map representing the events (note that the
> > management api makes no guarantees regarding the order of the attributes
> > so you have to parse at least until you encounter the "Event: XXX"
> > attribute). What you could save is creating the actual event object, but
> > well...
> >
> > I would recommend to really get some numbers using a decent profiler. If
> > you can provide something that is convincing we might very well have a
> > look at supporting it in future Asterisk-Java releases.
> >
> > =Stefan
> >
> >
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