Slower and slower and ...

[chrismalan]

Dear All,

I have a few near identical applications running at Alacarte Java.
These applications all tend to slow down over time. Restarting JBoss
brings them up to speed again. It seems the more visits, the quicker
they slow down - right up to the point of really bogging down.

The log-file is of no help.

Some of the ejb cmp beans have been configured as CMP 2.x and Cache in
jboss.xml They don't change that much and read queries most likely far
outnumbers write queries, which only takes place every few days, if that
often.

Some transactions involving only reads have been set to Supports.

All these applications are deployed as uncompressed directories (the root
one called whatever.ear in each case) in JBoss/server/default/deploy.

Alacarte Java seems to provide a JBoss running in its own process to each
account. So none of these applications even have a JBOSS_HOME in the same file structure. Stopping the JBoss of one account takes only that account's application "off the air."

It is never necessary to restart the database - MySQL.

Any idea as to what causes this slowing down? I would like the applications
to just run on for ever and ever, but I suspect that is asking a bit too much.

Support at Alacarte Java seems to be taciturn - so not much help there.

Any ideas will be appreciated.

Chris Malan

[juha]

Using supports for read-only data doesn't necessarily help anything (if the bean is invoked with a transaction, the read data is still locked). RequiresNew would work, or mark the methods as read-only in jboss.xml.

[chrismalan]

Thanks Juha,

Marking the method as read-only in jboss.xml will most likely consistently speed things up.

Any idea why JBoss restarts are needed from time to time?

Chris

[juha]

No idea. It's pretty difficult to guess without being able to analyze the application you're running.

[chrismalan]

Thanks Juha. Some of these problems are not easy to solve. Maybe one day...

Chris