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.

[Reagan]

I suggest you to check the memory allocated to this particular VM.

There should be way you can find it and then check whether the allocated memory for the VM is higher than the memory allocated for the database and SAP.

Regards

RB

[Former Member]

Hi all,

Regarding the main memory for the VM, please note that this VM is 'sharing' the 256GB of the main machine (global zone). On this main machine, there are other VMs also. I can know how much memory is being consumed by the VM (currently, it is consuming around 13GB). What I can do is that I can cap the memory of the portal server to something like 32GB, thus this 32GB will be reserved for this portal server.

regards

[Former Member]

Hi all,

Just to give a feedback. I raised the issue to SAP. SAP said it is a bug for which a particular patch (SAP J2EE ENGINE 7.02) needs to be applied.

Thanks for all the helpful tips.

regards.