RE: [mat-dev] Compare Basket feature

["Tsvetkov, Krum" <krum.tsvetkov@xxxxxxx>]

Hi Nitin,

 

We have no way to distinguish between Perm and Heap – the heap dumps do not contain such data. One specific problem that results in high Perm space consumption is that often classes and classloaders are not released properly when a Web app is stopped or redeployed on an application server. A helpful blog in this case may be: http://dev.eclipse.org/blogs/memoryanalyzer/2008/05/17/the-unknown-generation-perm/

Krum Tsvetkov
SAP AG
www.sap.com

http://www.sap.com/company/legal/impressum.epx

 

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From: mat-dev-bounces@xxxxxxxxxxx [mailto:mat-dev-bounces@xxxxxxxxxxx] On Behalf Of Nitin Mathur
Sent: Dienstag, 18. Mai 2010 17:49
To: Memory Analyzer Dev list
Subject: RE: [mat-dev] Compare Basket feature

 

Hi Krum,

 

Thanks a lot for the information. I will try new version and article. I have one more follow up question. Does MAT has the capability to show object per different memory areas? More precisely I am interested in knowing what exactly is in perm space (apart from classes like how many string intern etc.)

 

-Nitin

 

 

--

Nitin Mathur | Principal Service Delivery Engineer
Mobile: +1 4255774478
Oracle Advance Customer Services

Oracle is committed to developing practices and products that help protect the environment

 

 

From: Tsvetkov, Krum  
Sent: Tuesday, May 18, 2010 3:08 AM
To: Memory Analyzer Dev list
Subject: RE: [mat-dev] Compare Basket feature

 

Hello Nitin,

 

You are right that there is no detailed documentation on the compare basket feature. I added some quick description with several screenshots to the New & Noteworthy document for the 1.0 release which we published yesterday. You can download the latest version and look at the New & Noteworthy, or use the online document here:

http://www.eclipse.org/mat/1.0/noteworthy.html . Hopefully the short description there under “More Flexible Compare Functionality” can already help you.

 

In general, if you are troubleshooting an OutOfMemoryError in many cases the last heap dump is already enough to identify the problem. You can have a look at this blog:

http://dev.eclipse.org/blogs/memoryanalyzer/2008/05/27/automated-heap-dump-analysis-finding-memory-leaks-with-one-click/

 

Let me know if you have some further questions.

 

Krum

Krum Tsvetkov
SAP AG
www.sap.com

http://www.sap.com/company/legal/impressum.epx

 

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From: mat-dev-bounces@xxxxxxxxxxx [mailto:mat-dev-bounces@xxxxxxxxxxx] On Behalf Of Nitin Mathur
Sent: Montag, 17. Mai 2010 20:48
To: mat-dev@xxxxxxxxxxx
Subject: [mat-dev] Compare Basket feature

 

Hello All,

 

I am very new to this tool and need some guidance on compare basket feature. I am not able find documentation on this features.

 

I have a 3 dumps of an application. Two of them when application was healthy and last one when it threw OOM. I want to compare these three dumps to see which objects were growing. I am thinking may be compare basket feature can help me with this.

 

-Nitin

 

 

--

Nitin Mathur | Principal Service Delivery Engineer
Mobile: +1 4255774478
Oracle Advance Customer Services

Oracle is committed to developing practices and products that help protect the environment