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Home » Archived » Memory Analyzer (MAT) » Size: 0k?
Size: 0k? [message #8035] Mon, 08 December 2008 21:03 Go to next message
Will Taylor is currently offline Will TaylorFriend
Messages: 1
Registered: July 2009
Junior Member

This is my first attempt at using the Memory Analyzer tool and I'm having
some problems. I'm trying to analyze a dump from IBM WebSphere v6.0 and
I'm getting results I don't expect. No size information is loaded with
the dump. The Overview Details state:

"Size: 0 B Classes: 15k Objects: 16k Class Loader: 894"

Here's the output of "java -version" from WAS's JVM:
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2)
Classic VM (build 1.4.2, J2RE 1.4.2 IBM AIX build ca142-20060421 (SR5)
(JIT enabled: jitc))

I'm using the latest versions of Memory Analyzer and IBM DTFJ.

Am I doing something wrong when generating the dump? Do I have a version
incompatibility? Any help would be greatly appreciated.

--Will Taylor
Re: Size: 0k? [message #8069 is a reply to message #8035] Tue, 09 December 2008 09:17 Go to previous message
Andrew Johnson is currently offline Andrew JohnsonFriend
Messages: 180
Registered: July 2009
Senior Member
Are you processing a Jextracted core file (.sdff) or a javacore file? A
Javacore file is a readable text file with some limited information about
the JVM - classes, class loaders, threads etc. There isn't any useful
object information in a javacore file, so the sizes will be zero and
nearly every object will be missing. That is why the help says:

Processing Javadumps
The DTFJ adapter can process Javadumps (javacore.txt files) generated
using the -Xdump:java command-line option. This is not very useful within
MAT because the only information in the Javadump is a list of classes and
class loaders. There is no object or size information.
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