Re: [gatein-dev] Fix in portal list
On Nov 16, 2009, at 2:50 PM, Prabhat Jha wrote:
Are these stats on by default?
yes
What is the overhead of getting these metrics?
The collecting of data does not take much overheard, I have never
spotted them in my JProfiler so far.
The processing of collected data must not be free, but I would not
expect to have a sampling with a one second period to introduce much
bias.
BTW: It's awesome data to have.
thanks :-)
----- Original Message -----
From: "Julien Viet" <julien(a)julienviet.com>
To: gatein-dev(a)lists.jboss.org
Cc: "Wesley Hales" <whales(a)redhat.com>, "Marek Posolda"
<mposolda(a)redhat.com
>
Sent: Monday, November 16, 2009 4:28:20 AM GMT -06:00 US/Canada
Central
Subject: [gatein-dev] Fix in portal list
I want to bring to you that useful following statistic available via
JMX, specially in JBoss where you can use the JMX console.
Wesley has been using it for his bridge demo (and I fixed the bug that
was present Wes :-) ).
I believe also that Marek could collect information during load
testing and create graphs that would be correlated with the
performances graphs. (for instance , showing the portal throughput and
the average response time on the same graph, or showing the usage of
the various caches correlated with the througput, I guess you get the
idea).
With the JMX console, the statistics are interesting but it remains
limited, it becomes very useful only if we can exploit the data via a
more powerful tool with charting and gauges.
1/ service=statistic,type=portal,view=portal
- gives you the list of portal ids
- for a given portal id you can get info like:
1/ average execution time
2/ minimum execution time
3/ maximum execution time
4/ execution count (can be graphed)
5/ throughput, i.e number of request per second (can be graphed)
2/ service=statistic,type=template,view=portal
- list of the 10 slowest templates
- list of the 10 fastest templates
- list of the 10 most used templates
- list of all template ids
- for each template it is possible to have info about:
1/ average time
2/ min time
3/ max time
4/ execution count
3/ service=SessionRegistry
it gives the list of the number of active JCR session in the portal
which can be graphed as it gives a good indicator of the load on the
server
4/ each cache is registered under the key
name="$CACHE_ID",service=cache which gives the usual information
there are other few mbeans available but they are less interesting, so
I won't talk much about it.
cheers
Julien
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