Eclipse Community Forums: Memory Analyzer (MAT)

Help

Home

Home » Archived » Memory Analyzer (MAT) » Size: 0k?

Show: Today's Messages :: Show Polls :: Message Navigator

Size: 0k? [message #8035]

Mon, 08 December 2008 21:03

Will Taylor

Messages: 1
Registered: July 2009

Junior Member

Hi,

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.

Thanks,
--Will Taylor

Report message to a moderator

Re: Size: 0k? [message #8069 is a reply to message #8035]

Tue, 09 December 2008 09:17

Andrew Johnson

Messages: 205
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.

Report message to a moderator

Previous Topic:	How to get executing stack and local variable information?
Next Topic:	Review Results for Memory Analyzer 0.7 Release Review

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Tue Apr 23 10:27:04 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter