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Posted to ojb-user@db.apache.org by Edson Carlos Ericksson Richter <ed...@mgrinformatica.com.br> on 2006/02/08 17:45:57 UTC

Profiling OJB

Hi!

I'm running OJB under NetBeans 5.0 final with JDK 1.5.0_06 and NetBeans 
Profiler 5.0, OJB 1.0.3.

I just run the app, and I see 
RepositoryPersistor.readMetadataFromXML(org.xml.sar.InputSource, class) 
is called twice, taking incredible 5561 ms for execution (a 2780ms per 
call). It's number two for time startup problems in my app: the first 
one is ClassHelper.getClass(String, boolean), who takes 9913 ms over 
4520 invocations (so I think it's ok, about 2.1 ms per call).

My question isn't why so longer readMetadataFromXML, but why twice?

Any tips?

Richter

Re: Profiling OJB

Posted by Armin Waibel <ar...@apache.org>.
Hi,

Edson Carlos Ericksson Richter wrote:
> Hi!
> 
> I'm running OJB under NetBeans 5.0 final with JDK 1.5.0_06 and NetBeans 
> Profiler 5.0, OJB 1.0.3.
> 
> I just run the app, and I see 
> RepositoryPersistor.readMetadataFromXML(org.xml.sar.InputSource, class) 
> is called twice, taking incredible 5561 ms for execution (a 2780ms per 
> call). It's number two for time startup problems in my app: the first 
> one is ClassHelper.getClass(String, boolean), who takes 9913 ms over 
> 4520 invocations (so I think it's ok, about 2.1 ms per call).
> 
> My question isn't why so longer readMetadataFromXML, but why twice?
>

It's because OJB once read the persistent object metadata 
(RepositoryXmlHandler) and then the connection metadata mapping 
(ConnectionDescriptorXmlHandler).
It would be possible to do this in one class (this was the case in older 
OJB versions), but I separated this stuff to make things more clear 
(servicing classes with nearly 1500 LOC isn't easy).

For OJB 1.x the complete metadata handling rework is on the roadmap.

If you could provide a faster metadata handling/reading or some 
optimization for 1.0.x, please let me know.

regards,
Armin


> Any tips?
> 
> Richter
> 
> 
> 
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