Good point. I will look into that.
Many thanks.
Rui
On Fri, 28 May 2004, Tim Funk wrote:
> Personally - I would run many instances of tomcat clustered to get the
> performance you need. It would be much more predictable to maintain.
>
> -Tim
>
> Rui Zhang wrote:
>
> > 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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