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From Mark Thomas <ma...@apache.org>
Subject Re: Tomcat Online Parameter Setting/Tuning
Date Tue, 12 Mar 2019 18:45:31 GMT
On 12/03/2019 16:05, Supun Abeysinghe wrote:
> Hi all,
> 
> I am working on a project where the parameters of the tomcat server (e.g.
> MaxThreads, MinSpareThreads, MaxSpareThreads etc.) for a given web
> application is auto-tuned using a machine learning technique by looking at
> the runtime characteristics (e.g. workload characteristics, current
> performance etc.). As of my knowledge, the typical way of setting these
> parameters is by changing the server.xml inside the {catalina-home}/conf
> folder. In order to reconfigured/tuned values to get updated, we need to
> restart the tomcat server. However, the project that I'm working on
> requires the ability to change the parameters dynamically while the system
> is running.
> 
> I have looked into several approaches. One way is to use JMX and use the
> setters to set the parameter values. I have tried setting the MaxThreads
> parameter of the shared executor thread pool and it seems to be working
> fine. Now I'm looking into using that approach and set it up in my source
> code and access MBeans to change the parameters.
> 
> I just wanted to know whether I'm going in the right direction. Also, is
> there any other easier way of achieving what I want? I have gone through
> prior work in this research area and seen many people have tuned tomcat
> parameters in such a fashion. However, there seems to be no docs/articles
> on this topic. Am I missing something here? Any feedback is highly
> appreciated!

JMX is the right approach. Just keep in mind that changes to some
parameters don't take effect until the component is restarted.

You might want to consider using

http://tomcat.apache.org/tomcat-9.0-doc/config/listeners.html#StoreConfig_Lifecycle_Listener_-_org.apache.catalina.storeconfig.StoreConfigLifecycleListener

to persist any changes you make.

The other thing to keep in mind is that most of the time is spent in
application code so you normally get a bigger return for your investment
if you focus on application tuning.

Mark

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