Hi everyone,
I'm currently working on the bmp entity beans implementation and I'm
nearly finished now. I hope I can integrate the modifications tomorrow
so that tomorrow evening jboss 2.0 is bmp entity beans capable again.
The problem I'm currently running in is the performance issue. I'm
running an WinNT 4.0 with 400Mhz, 192MB and fetching 25 BMP entity
beans from an session bean. Each entity bean has four properties
(simply returning the internal variable).
Each methods needs between 200 and 320 milliseconds regardless whether
running the test for the first or the second time. Running the test
first time includes the creation of the entity beans. Second time
the entity beans are already created and are simply accessed by
reference. So i can extract the database performance from the time
needed to fetch the properties of the beans.
Well, i realized that i need nearly one second to fetch the data from
one entity bean and then 15 seconds to fetch the data from 18 entity
beans. By using an session bean there were no costs for client
communication etc. Looking at the stack trace the session bean still
establishs connection via the RMI. After the remote method invocation
the fetching time is less than a millisecond (measured inside the jrmp
invocation handler).
It's obvious that rmi communication must be done for client
communication (even the session bean is an client to the entity
beans). Is there any way to optimize the connection and bypassing rmi
if both beans are in the same process environment?
After exhaustive testing i think that's one of the main performance
problems. Anyone did the same experiences?
Stephan.
