[JBoss-dev] [Design of Persistence on JBoss] - Hibernate performance problems in JBoss

[MassMadX <nu...@jb...>]

Hello everyone,

last day I did some tests concerning the performance of Hibernate within
Jboss and "standalone".
I came to some disappointing results 
concerning the performance within JBoss (using CMT):


1) The datasource access seems to be significantly slower as with Hibernate "standalone". 
In some examples it was three times slower.

2) Moreover I was not able to do caching (using Hasttable, EhCache, as well as JBoss' TreeCache) beyond the scope of a single transaction.
This dramatically decreases the performance.
I  mean  the following: 
When I perform a certain select statement for
the first time within a transaction it takes about 750 msecs, 
if i perform it again within the same transaction (i.e., within the 
same ejb-method call) it takes 60 msecs.
Now, if perform this transaction (i.e. ejb-method call) again and again,
 it always takes  the same 750 resp. 60 msecs. 
For me it seems that there is no caching beyond transaction scope. 
Btw, I encountered no differences when using transactional, read-write,
nonstrict-read-write caching....

Now I wonder about the following:

Did I do something seriously wrong?

Is it not possible to do caching beyond the scope of a single transaction
(which seems to be very unlogical to me)?

Btw, I used a standard hibernate-service.xml. 
Moreover, I used postgres and the standard postgres-ds.xml.
(but hsqldb was the same).

Thanks a lot for your help, best wishes and happy eastern

Michael

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