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From "C N Davies" <...@cndavies.com>
Subject RE: Speeding up commit
Date Tue, 14 Jun 2011 14:54:41 GMT
I had a load of issues with committing large quantities of entities (OpenJPA
2.0), in the end I batched them into batches of 200 and the overall
performance was significantly better.  This is not a scientific analysis of
the issue I know, but might be of use to you :)

Chris


-----Original Message-----
From: Aron Lurie [mailto:aron@cambridgesemantics.com] 
Sent: Wednesday, 15 June 2011 12:50 AM
To: users@openjpa.apache.org
Subject: Re: Speeding up commit

2.1.0

On 6/14/2011 10:47 AM, Rick Curtis wrote:
> What version of OpenJPA are you running?
>
> On Tue, Jun 14, 2011 at 9:45 AM, Aron
Lurie<aron@cambridgesemantics.com>wrote:
>
>> Hello,
>> I have a situation where I am trying to persist ~2500 objects all at
once.
>> After the objects are persisted, the program ends, so there is no 
>> need for any functionality after the objects have been persisted. I 
>> am just trying to dump these objects to the DB as fast as possible.
>>
>> Using Eclipse's TPTP profiler, I have timed the 
>> EntityManager.commit() operation to take 586 seconds. Of that, 
>> cumulatively almost 455 seconds are spent inside of ~2500 calls to
StateManagerImpl.proxyFields(bool, bool).
>>  From the point that I start commit(), those 2nd class objects are 
>> not mutated by my program, and I do not need to use any of these 
>> objects after
>> commit() finishes. From what I have read, it would seem that I have 
>> no need for my objects to be proxied, and from my tests, it seems 
>> that removing proxies would speed things up significantly. Am I 
>> missing something? Or is there a way to turn off proxies? And if not, 
>> how can I speed up the proxying operation?
>>
>> Thanks,
>> Aron
>>
>
>


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