Hi @ all,

We're using above environment on two servers with different applications 
deployed (one EJB3, other EJB3/Seam2). Communication takes place between both 
servers via webservice calls and we noticed peaks of response times while 
testing our server functions and the calls between them:

One interessting peak occours regulary every 12 minutes:

- Avarege time: 2 seconds (a PDF along with some data is being transferred)
- Peak time: 20s (right after server start) up to 2 minutes (after two hours of 
load) and thus breaking our webservice timeout!

I load tested with SoapUI to on a simple isAlive webmethod on both servers and 
it gives me the same behavoir, so its repeatable at our environment (tested 60 
seconds with 1 thread):

server 1:

Avarage time: 12 ms
Peak time: 300 ms

server 2:

Avarage time: 7 ms
Peak time: 150 ms 

So the implementation does not really matter IMHO. For our SLAs we need to 
deliver webservice response within reasonable response times, for example 
isAlive must complete in less than 100ms in every single threaded case, so we 
have some puffer left for concurrent access with an average response time of 
around 10-15ms.

Does anybody have experiences with such a situation, any hints where to look 
for answers/information? I tried googling and searching this forums but did not 
find an answer. 

Thank you for your help,
best regards

Gerhard Balthasar

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