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Retained heap in histogram view [message #505187]

Mon, 28 December 2009 12:48

No real name

Messages: 1
Registered: December 2009

Junior Member

I am new to eclipse MAT and and a bit dubious regarding following points

In histogram view of a heap dump,
for certain class entries I get no. of objects 0 but still the retained heap shows >=2048 (i.e more than 0)
What exactly is retained heap and what does this indicate?

Also I really liked the OQL tool integrated with MAT. Is there any official tutorial to learn its syntax?

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Re: Retained heap in histogram view [message #505250 is a reply to message #505187]

Mon, 28 December 2009 22:55

Krum Tsvetkov

Messages: 164
Registered: July 2009

Senior Member

The class histogram also includes the class instance. So if there is a class with several static fields, and there are 0 instances of the class, you will still see retained heap > 0 and 0 instances.

About the OQL: if you press F1 when you open the OQL view, you should get some help and the syntax.

I hope this helps.

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