Portal Java Systems_GC Heap Log file

[Former Member]

Hi,

Does anyone know how to read the GC Heap log file which is usually named in the format of "_std_serverN.out_" and located under

/usr/sap/<InstanceNumber>/work directory ?

Or if you know of any website or document that provides more information in regards to this log file.

All inputs are appreciated!

[desiree_matas]

Hello Musa,

You should check this documentation:

http://java.sun.com/docs/hotspot/gc1.4.2/

It explains quite in detail the garbage collector process for the Sun JDK. If you are using the IBM one instead, the behaviour is different. IBM JDK has its own GC log (no FullGC, for example)

Best regards,

Désiré

[Former Member]

Hello,

if you have an actual Solutionmanager (EHP1) you can analyze the file with the 'Java Memory Analysis'. Start transaction SOLMAN_WORKCENTER, goto tab 'ROOT CAUSE ANALYSIS' and chose 'Java Memory Analysis' on the left. Upload the log file to get a graphical analysis.

Christian

[hemanth2]

Dear Musa,

A tool to read IBM GC output can be downloaded from

http://alphaworks.ibm.com/tech/gcdiag

Regards,

Hemanth

[Former Member]

Hi Musa,

I think [this|http://www.petefreitag.com/articles/gctuning] link gives a clear outline about java GC.

Kind regards,

Mark