I think the question you wanna ask yourself first is, do you want to monitor tomcat or do you want to monitor your application?
regards Leon On Wed, Nov 19, 2008 at 3:18 PM, Kees Jan Koster <[EMAIL PROTECTED]> wrote: > Dear Chris, > >>> I am setting up a monitoring system for Tomcat servers and I am looking >>> for hard limits in Tomcat servers in general. >>> >>> I found a few so far: file descriptors, memory pools (ok, these are jdk >>> limits) and thread pools. >>> >>> Are there any other hard limits that I can run into? >> >> I would call these soft limits, as they can be changed. > > Ah, sorry for the confusion. I should have asked for limits that are hard at > run-time. Thread pool sizes may be editable, but they are fixed once Tomcat > runs. > >> What limits are relevant? For instance, Java doesn't allow you to have >> any method with more than 64k of code. I suppose that's of little >> consequence to a running JVM, since the code would never be loaded. > > Yes, I ran into that limit for a generated servlet once. This is not the > kind of limit that I am looking for, as it is caught compile-time, not > run-time. > >> If you are going to count memory (heap?) and file descriptors, I suppose >> you could also count CPU time, since that is a limitable resource on >> *NIX systems. > > Hmm. It's really only useful if I can monitor both the maximum available > time and the used time. I have no idea how I would measure that, even at > unix level. It gets even more messy in virtual servers. > >> If you really are talking about soft limits, then you probably also want >> to see the number of requests accepted but not yet being handled >> (controlled by the <Connector>'s "acceptCount" attribute), the number of >> request processors (is this "thread pools" above?), the number of >> connections total/available/used in JDBC connection pools. > > > Ah, that is interesting too: queue fill levels that should under normal > circumstances be more or less empty. Much like the > ObjectPendingFinalizationCount. Thanks for that. > > How would I use it, though? In my Tomcat acceptCount has a value of 100. > That's probaly an upper limit. What is the 'un-use' property that goes with > this upper limit? > > What MBean can I talk to about JDBC connection pooling? > > -- > Kees Jan > > http://java-monitor.com/forum/ > [EMAIL PROTECTED] > 06-51838192 > > Human beings make life so interesting. Do you know that in a universe so > full of wonders, > they have managed to invent boredom. Quite astonishing... -- Terry Partchett > > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
