Simone, Juha,
this is a very interesting thread, I was unaware of the extent of the work
juha did :))))
re: the overhead affecting performance it is a non-issue. At production
time, you never run at benchmark conditions (they are artificial) and all
you want is "administration and stats" so you know what you are doing. I
remember the SAP days, when the load would become to much the admin would
just throw more hardware at the problem but never never never turn off
monitoring and stats... suicide for admins.
Ask any admin: (raw speed) vs (ease of admin and stats)?
also JMS is frankly lightweight, very lightweight
marc
|-----Original Message-----
|From: [EMAIL PROTECTED]
|[mailto:[EMAIL PROTECTED]]On Behalf Of Juha-P Lindfors
|Sent: Monday, December 04, 2000 7:08 AM
|To: jBoss
|Subject: RE: [jBoss-User] Remote jboss monitoring
|
|
|
|Hi,
|
|yes the metrics will affect performance. nothing we can do about that
|really (except trying to keep it as small as possible). Which is why the
|metrics should always be a feature that can be turned on only when you
|need to see how your app is doing at the moment, tweak it, and turn it
|off.
|
|On Mon, 4 Dec 2000, Bordet, Simone wrote:
|> Very interesting. How do you suggest to write such a thing for
|the cache ?
|> There is any problem to send zillion messages, as cache activity can be
|> really high (for example in benchmarks).
|
|well I wouldnt turn the metrics on for benchmarks (it isn't really suited
|for that). For "normal" usage, I'd expect a graph of the cache size to be
|useful, and how it varies during different time periods and under
|different loads, etc. Something you can sample quite infrequently
|(when measuring in milliseconds).
|
|The metricsinterceptor itself sends a message with each method call which
|is rather extreme and certainly something you wouldn't keep around for
|long periods of time in a production environment. Same thing goes for
|caches.
|
|
|> Will this be something like this ?
|> add a topic in Spyder and register it on JNDI
|> every time the cache does something interesting, send a message to this
|> topic (or maybe subtopics)
|
|yep, when you init cache, get topic from JNDI, register as a publisher to
|that topic, when say, cache is resized, send off a msg.
|
|
|> How will it impact on cache performance ?
|
|metrics always has overhead.
|
|> Does all the messages are kept by the topic or they're cleaned
|after a while
|> ?
|
|Depends on the topic settings: PERSISTENT/NON-PERSISTENT and the publisher
|can set time-to-live value.
|
|-- Juha
|
|
|
|
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