Re: [eclipselink-users] memory usage

[James Sutherland <jamesssss@xxxxxxxxx>]

Are you using JTA, or RESOURCE_LOCAL?

Are you using the same EntityManager, or do you create a new one for each
transaction?

What cache setting are you using?

I would recommend you create a new EntityManager per transaction, otherwise
the previous objects will still be part of the persistence context.  You
could also call clear().

You can try disabling the cache (shared=false), or using a weak cache.

Do you run out of memory, or just notice a memory increase?  You may wish to
try a memory profiler such as JProfiler.

Also ensure that your application is not holding onto any or the objects.


DavidParker wrote:
> 
> Yeah, we are using multiple transactions, i.e.
> 
> get an EntityTransaction
> do work
> EntityTransation.commit()
> set the local tx to null
> 
> 
> On Oct 19, 2009, at 5:59 PM, Dave Brosius wrote:
> 
>> Is the import all in one transaction? I'd be curious if you broke up  
>> the import (even for a test) into multiple transactions whether the  
>> issue would go away.
>>
>> -----Original Message-----
>> From: "David Parker" <dap@xxxxxxxxxxxxxxxxxxxx>
>> Sent: Monday, October 19, 2009 5:51pm
>> To: "EclipseLink User Discussions" <eclipselink-users@xxxxxxxxxxx>
>> Subject: [eclipselink-users] memory usage
>>
>> I am running a long data import that uses eclipselink 1.1.2 for
>> persistence. I see memory increasing slowly but surely as it goes
>> along. The YourKit profiler does not identify anything as a link, but
>> I do seem to have an increasing "retained size" for
>>
>> org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork
>> [Stack Local]
>>
>> I see there is a clear method on TransactionWrapperImpl, but that does
>> not seem to be in the JPA EntityTransaction API.
>>
>> Is there a best practice for long running data imports? Should I be
>> clearing something?
>>
>> Thanks.
>>
>>
>> =============================================
>> David Parker
>> dap@xxxxxxxxxxxxxxxxxxxx
>>
> 
> 


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