Re: EOF related objects present a lot in the heap
Re: EOF related objects present a lot in the heap
- Subject: Re: EOF related objects present a lot in the heap
- From: Chuck Hill <email@hidden>
- Date: Fri, 26 Apr 2013 10:12:32 -0700
Are you using the session's default editing context exclusively? For memory usage optimization it is best to treat that as a read only editing context and just use it for session spanning objects (like the current user, their roles and permissions). Then on each page, or in each stream of activity, create, lock, use, unlock, and dispose of a new editing context. I covered this in at least one of my WOWODC presentations.
You can also make an EC subclass and clear the undo stack after a successful save:
public void saveChanges()
{
super.saveChanges();
if (undoManager() != null)
{
undoManager().removeAllActions();
}
}
Though that is less useful if you are only keeping the EC alive for one save cycle.
Chuck
On 2013-04-26, at 4:55 AM, Joseph Pachod wrote:
> Hi
>
> When looking at some memory dumps, I see huge numbers of EOF related instances, such as, by decreasing order and with % of instance nb and % of heap size :
> - _EOHandlerWeakRef 5,8% - 5,1%,
> - EOAccessArrayFaultHandler 5,7% - 6,6%
> - _EOCheapCopyMutableArray 2,9% - 1%
> - _EOMutableKnownKeyDictionnary 2,1% - 3;3%
> - _EOWeakReference 1,2% - 1%
>
> The overall JVM is about 360Mo. Each session of the application looks like holding quite some of them (they're nicely garbage collected on session termination). So they look like editing context related.
>
> I was wondering it there were some tricks to clean up these objects.
>
> For example can the WeakReference be clean up somehow ? Can the editing context cache be cleaned up to retain only the dirty objects ? Or maybe to remove some of the least used entities (or not used for quite some time) ?
>
> Any hint welcomed :)
>
> Thanks in advance
> best
>
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Chuck Hill
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