Re: Parfait agent, docs, rpm updates

Hi Marko,

----- Original Message -----
> On 2016-11-25 01:55, Nathan Scott wrote:
> > 
> >> Defining the same cluster ID for two different agents using different
> >> name seems to work, it should probably fail to prevent accidents as
> >> their PMID is the same in this case.
> > 
> > pmdammv is actually capable of stitching together metrics from multiple
> > files - people even use this to provide different instances of a metric
> > from different applications for example.  So, its not necessarily an
> > accident when it happens, which makes guarding against accidents tricky.
> 
> Ok, perhaps a quick note on the man page might be helpful?
> 

Yep.

> >> With WildFly (10.1.0.Final) I still see the same logging related
> >> exception when trying to start it up after adding this to start script:
> >>
> >> JAVA_OPTS="-Djava.util.logging.manager=org.jboss.logmanager.LogManager
> >> -Dparfait.name=wildfly -javaagent:/usr/share/java/parfait/parfait.jar
> >> $JAVA_OPTS"
> > 
> > Not sure this is going to be fixable ... still looking for solutions, but
> > its Wildfly being really paranoid about logging.  This may end up being a
> > case where the proxy mode has to be used I guess, good thing we have that
> > solution up our sleeve now.
> 
> After discussing with some Java folks here gave me impression that it's
> not exceptional at all that JMX is used in production for metrics (after
> all, the metric values don't appear out of thin air and in some cases
> require the application to do some additional work making them available
> so the cost of transportation (memory vs socket) to a client is not
> necessarily the key factor), however in some cases JMX is not viable

OK, interesting stuff - thanks for the summary.

> - in order for PCP/Java being a compelling offer on this front a
> complete set of metrics at least from the OpenJDK JVM should be
> available and preferably from some of the most ubiquitous components
> (WildFly, Cassandra, Tomcat, etc) as well

+1  (and per-thread stats, and ..., and ... there are Tomcat stats hiding
somewhere, I believe, like the per-thread stats - just need to find 'em &
stitch them into the parfait-agent spring configs)

> - there should be a couple of examples on how to add new metrics for
> in-house applications

There are some simple examples now, incl. the Acme example from other MMV
implementations.  It would be good to add a Spring implementation of that
as well.

> - BCI (byte code instrumentation) integration / support would be great
> although I'm not yet completely sure what this actually means :-) A
> trivial example could be that in R&D/QA BCI may be helpful to verify
> class usage is as expected (so instead of the total class load count JVM
> provides break that down to class level metrics). Byteman seems to enjoy
> popularity on this front, not sure what it would take to for example
> connect with it using Parfait or JSON or something lese. Or are there
> some more elegant solutions that could be considered here for such cases.

Yep - definitely an interesting area to explore.

cheers.

--
Nathan

-=-=-=-=-=-=-=-=-=-=-=-
pcp mailing list
[email protected]
https://groups.io/g/pcp/messages
-=-=-
Groups.io Links:

You receive all messages sent to this group.

View/Reply Online (#14836): https://groups.io/g/pcp/message/14836
View All Messages In Topic (6): https://groups.io/g/pcp/topic/2984744
Mute This Topic: https://groups.io/mt/2984744?uid=174580
New Topic: https://groups.io/g/pcp/post

Change Your Subscription: https://groups.io/g/pcp/editsub?uid=174580

Group Home: https://groups.io/g/pcp
Contact Group Owner: [email protected]

Terms of Service: https://groups.io/static/tos

Unsubscribe: https://groups.io/g/pcp/leave/354243/563757577/xyzzy
-=-=-=-=-=-=-=-=-=-=-=-