Hi, As an aside, 5.0.26 will have request processor thread priority settable as an attribute on the connector.
Definitions of QoS are vast and varied. Asking where to start is kind of like asking where to start when you write a constitution ;) Yoav Shapira Millennium Research Informatics >-----Original Message----- >From: Rui Zhang [mailto:[EMAIL PROTECTED] >Sent: Friday, May 28, 2004 5:59 PM >To: Tomcat Users List >Subject: Re: QoS in Tomcat? > >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. >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
