Full Grabage Collection Problem

[#1]

Hi All,

I was getting a "RED" EWA report sometime back for Full Garbage collection for one of our JAVA only AS. I increased the JAVA heap memory for all the server nodes (I have 3 server nodes) from 1024MB to 3072MG. After that, the problem got solved and I was getting normal report and there was not full garbage collection problem.

However, from past 4 weeks, I have been getting the same full garbage collection. I looked into the std_server<no> files and found that, std_server0 has more number for full garbage collection recording than other two. However, I dont know what to do next in this regard. Should I again increase the heamp memory for all the nodes? If so, then what should I do if again I get this problem in future? If not, then how can I diagnose this and troubleshoot?

Please guide.

Regards,

Faisal

[Former Member]

Faisal,

The garbage collection frequency and duration are all relative, and therefore it is hard to give you a sound advise without a specific case.

The duration of full garbage collection is impacted by hardware, memory speed, and the amount of memory configured.

Thus if your heap space is 2GB, you will have shorter but more frequent GC, than if your memory is 3 GB. In the former case you will have lass frequent but longer full GC.

Before you change your memory configuration, or add server nodes, could you please share how frequent and long are the garbage collections on your system?

What is the usage type of your system?

Best,

Ventsi Tsachev

[former_member184114]

Hi Ventsi,

Thanks for your kind reply.

I looked into std_server0.std file and it was modified last today (12/20/2011). I searched for "Full Garbage" and noticed that, it occurred 43 times. However, I think this is accumulated over a period of time and this will was started from 12/03/2011. Therefore, I am unable to tell you how many times it occurred in today's date. Please let me know how I can determine the same on a specific date.

Please suggest.

Regards,

Faisal