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How to include retained size column (with precise or approximate values) in histogram command result [message #1853398]

Thu, 30 June 2022 12:54

R Chinmay

Messages: 1
Registered: June 2022

Junior Member

Hello Eclipse MAT community, I really loved using this tool for heap analysis. But the major problem I am facing is that the histogram command does not include retained size by default (I actually would not care if it took a lot of time, because the hprof file I am testing with is usually small, around 100MB file with small number of objects too). I also tried using the dominator tree (grouped by class) api command, but it only gives the top level class details as a result from query command. Usually for my programs, it tells that the Thread class is taking about 99% of retained heap, but I would not be able to see what classes under Thread is taking more memory, which is possible in UI application of mat. Also calculating retained heap sizes in histogram table is possible in MAT UI application. But I am not able to find how to do it using the api, since I have to write a script which would a part of another program (which would use this result). If either including retained size column in histogram, or expanding dominator_tree command to print deeper levels is not possible using the API presently, could anyone please guide me how to do it using a custom query, or if it is not possible presently?
Thank you in advance.

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Re: How to include retained size column (with precise or approximate values) in histogram command re [message #1853412 is a reply to message #1853398]

Thu, 30 June 2022 16:41

Andrew Johnson

Messages: 205
Registered: July 2009

Senior Member

Memory Analyzer 1.13.0 calculates the approximate retained sizes for the histogram command by default.
573908 Generate RetainedSizeCache for classes during indexing

Another idea - the overview report calculates the histogram with the approximate retained sizes. See the source code for overview.xml Here is a snipppet.

	<query name="%overview.class_histogram">
		<param key="html.separate_file" value="true" />
		<param key="sort_column" value="#3" />
		<param key="derived_data_column" value="_default_=APPROXIMATE" />
		<command>histogram</command>
	</query>

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