Hello,
it is not a test application it is our online shop in a load test using a 
professional load tool (PureLoad). Objects are loaded from the database and 
stored in the cache based on queries in http requests. I should mention that 
the long GCs occur mostly during the cache warmup phase and that memory is 
quite stable after that. I should also mention that we load the application 
quite heavily, the average GET frequency on a single  JBossCache is around 3000 
per second. 

We are using the fc-fast configuration (as defined in JGroups 2.2.7) which have 
worked well in production.

Anyway, I don't expect you to be able to diagnose any possible cause. There 
could be many reasons for this behavior where some of which may be related to 
the application server or JDK. Since we are looking into upgrading/changing 
J2EE platform in the near future I think we are going to revisit the 
JBossCache/JGroups upgrade at that time.

(BTW thank you for the dinner conversation we had in Stockholm in March. It was 
very interesting to hear about your plans for JGroups in the future.)

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