Full GC on java server nodes

[Former Member]

Hi guys,

My portal system is on SAP NW 7.0 EHP2 and backend on ECC 6 EHP6.  Recently, on the portal system I'm getting lot of Full GCs and concurrent mode failure. I have two server nodes and heap size set to 3gb for both (It was 2gb initially). When the Full GCs and concurrent mode failure are occurring, users are not able to work on the portal application and it is timing out. It is only becoming operational again long after a heap dump occurs or I restart the instance manually.  Please suggest how I can resolve this issue.

Additional info: The portal is a Tax Officer Portal used to view, input and amend tax returns. Since the portal is java stack, my ECC system uses this java stack for ADS (z-reports displayed in PDF).

So the issue is that I'm unable to know what is causing the frequent Full GC situation and the OOM heap dump. I tried to analyze using Memory Analyzer but it's not clear enough. Please advise.

Regards.

[Former Member]

Hi,

It seems problem is with HEAP memory for each server node to be 3047 MB. This will solve the issue.

http://scn.sap.com/message/10565377 - Answered.

Regards,

Prabhakar

[Former Member]

Hi guys,

As I mentioned earlier, I've set the -Xms to 3072M, increased the -XX:MaxPermSize to 768M and -XX:PermSize to 768M and restarted the system. As of now, I'm not getting any Full GCs and concurrent mode failure but I'm monitoring it. Let's see over a few days how it behaves.

Is there some good documentation on Concurrent Mode Failure, Full GC, GC etc?

regards.

[Former Member]

Hi Suraj,

Great now the issue has fixed, Please close the thread - answered.

you will not get the issue again, pls refr my doc, this has been fixed similally.

We can have new thread for Concurrent Mode Failure, Full GC, GC etc.

BR,

Prabhakar