Dirty checking Performance issue

[graffer]

Hi guys,

Are there any limitations concerning the persistence cache in OpenJPA? I'm having an application that loads several thousand entities and then adds some using em.persist(newEntity);

The problem is that persists takes extremly long (up to serveral seconds per entity on a server machine)!
The profiler shows me that the persist method stays very long in the dirty checking:

90,8% - 1.266 s - 31 inv. org.apache.openjpa.kernel.ManagedCache.dirtyCheck

Flushing or evicting entities from the session is not possible in this application.
Can anyone help with this issue?

bye, Georg
--
Psssst! Schon vom neuen GMX MultiMessenger gehört?
Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger

[Patrick Linskey-2]

Hi,

Can you describe your environment in a bit more detail? Is the OpenJPA  
code being called from a main() app? A Java EE app?

-Patrick

On Jul 3, 2008, at 6:33 AM, Georg Raffer wrote:

> Hi guys,
>
> Are there any limitations concerning the persistence cache in  
> OpenJPA? I'm having an application that loads several thousand  
> entities and then adds some using em.persist(newEntity);
>
> The problem is that persists takes extremly long (up to serveral  
> seconds per entity on a server machine)!
> The profiler shows me that the persist method stays very long in the  
> dirty checking:
>
> 90,8% - 1.266 s - 31 inv.  
> org.apache.openjpa.kernel.ManagedCache.dirtyCheck
>
> Flushing or evicting entities from the session is not possible in  
> this application.
> Can anyone help with this issue?
>
> bye, Georg
> --
> Psssst! Schon vom neuen GMX MultiMessenger gehört?
> Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger

--
Patrick Linskey
202 669 5907

[graffer]

Hello Patrick

Thank you for your fast reply. Sorry that I described the problem in such a short way.
In detail it is a JBOSS 4.2.1 application where we try to replace Hibernate with OpenJPA. Java 5 is used. Therefore we use the runtime enhancement. As I now found in the mailing list this is the problem. Changing to build time enhancement solves the problem:

http://mail-archives.apache.org/mod_mbox/openjpa-users/200807.mbox/browser

It now works as expected.

bye, Georg
--
Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten
Browser-Versionen downloaden: http://www.gmx.net/de/go/browser