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DeltaDataTree and OOM [message #1369564]

Tue, 20 May 2014 16:48

Aurélien Pupier

Messages: 637
Registered: July 2009
Location: Grenoble, FRANCE

Senior Member

Hi,

I encounter Out Of Memory exception when importing quite large Eclipse projects in our Eclipse RCP application.

I took a Heap Dump and it reports that 2 instances of org.eclipse.core.internal.dtree.DeltaDataTree are taking 290Mo on the 512Mo available (xmx set to 512Mo).

When I look a little deeper, I have 44 426 instances of DeltaDataTree.

So after, I take a look to the shortest path to GC root and in fact there are a *LOT* of DeltaDataTree having another DeltaDataTree as a parent and they take a lot of memory.

I noticed this bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=398104 closed as not reproduced in 4.3.1 but I'm in Eclipse 4.3.1.
I'm also doing several clean/build in the workspace. I will try to deactivate them to test it in th ecoming days.

But here are my questions:
- what is a DeltaDataTree?
- In which case we can have a very deep hierarchy of references from one to another?
And if someone have any hints on what I should investigate more.

Regards

Aurélien Pupier - Red Hat
Senior Software Engineer in Fuse Tooling team

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