tomcat monitoring metrics - explain

[acastanheira2001]

Hi,

Where does can I get an explanation of the "Tomcat monitoring metrics"?

Many of them are self explanatory, but some makes me wonder....


Thanks,
Andre

[peterj]

Where did you see "Tomcat monitoring metrics"? I thought you click the "Tomcat Status" or 'full' link on the JBosAS home page, but neither page had anything with that title.

[acastanheira2001]

Peter,

Thanks in advance for the instant reply.

I saw the doc http://www.jboss.com/pdf/monitoring.pdf. In the section "Tomcat monitoring metrics" there are many metrics that I would like to know the definition of.

For example, what is the definition of "total processing time per minute" metric?
I think tomcat evaluates the time required to process the requests on a minute basis. Who knows?

A list with the metrics definitions would be appreciated.

Thanks,
Andre

[peterj]

googling "total processing time per minute" shows that tools other than JBossON provide this metric - tools like Hyperic (hmm, only one tool by used by Covalent, HP and others). Of course, no-one mentions how this metric is calculated. And I could not find any description of the metrics. I wonder if the JBossON help text provides any insight?

Looking at all of the metric names, I suspect the that "per minute" metrics are reset to 0 every 60 seconds so what you are getting is the metric value from the prior 60-second interval. I suspect that "total processing time" is the amount of time that the process was running on the CPU (as opposed to on the wait queue or waiting for things such as requests to come in).