Many thanks, Tim. That at least sounds worth a try... I've got a valve
sampling performance data up and running already.
But, Is it sensible we may alter Tomcat to make it QoS-enabled? If
so, where shall we look at to start?
Best regards,
Rui
On Fri, 28 May 2004, Tim Funk wrote:
> Nope. The spec doesn't spell this out. If your feeling daring, you could
> write a filter that tries to set and reset the Thread.priorities on the fly.
> Then if your JVM pays attention to the thread priorities - you might get the
> tweaking you need. (You can also do this in a Valve if you want to be lower
> in the stack but I really doubt any of this is useful but its a great time
> waster on a cold rainy day)
>
> For example - without all the need try catches ...
> doFilter(...) {
> int newPriority = magicMethodToDeterminePriority(request);
> int oldPriority = currentThread().getPriority();
> currentThread().setPriority(newPriority);
> chain.doFilter();
> currentThread().setPriority(oldPriority );
> }
>
> -Tim
>
> Rui Zhang wrote:
>
> > Hi all,
> >
> > Is there any infrastruture availabe (or at least any possiblities) in
> > Tomcat to tune the QoS requests are receiving?
> >
> > For instance, is it possible to give differentiated treatments to
> > requests of various importance, by granting them different amount of
> > resources, queueing them differently, etc?
> >
> > I realise my questions might be a bit vague, as I don't have too much
> > insight about Tomcat. All I'm looking for are some knobs in Tomcat that we
> > can turn to affect its performance, either observed by different groups of
> > requests or by all the requests on a whole. If there are no such knobs at
> > all, would it be possible to amend the current Tomcat with it?
> >
> > Any advices (or at least what readings I should do to acquire that
> > knowledge) would be greatly appreciated.
> >
>
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