Java VM Settings to avoid memory leaks

[Former Member]

hello gurus,

we have currently a few memory problems with our netweaver AS Java. Once a week our server dies because of "return code 666: out of memory". We are using a netweaver AS Java 640 on an Windows 2003 x64 Server. It is a dedicated machine with 16 GB Ram. The memory settings in the JVM are:

-Xms4096M

-Xmx4096M

-Xss2M

-XX:+DisableExplicitGC

-XX:+PrintGCDetails

-XX:+PrintGCTimeStamps

-XX:+UseParNewGC

-XX:+UseTLAB

-XX:CodeCacheMinimumFreeSpace 2M

-XX:CompilerThreadStackSize 4096

-XX:MaxNewSize 682m

-XX:MaxPermSize 2048m

-XX:NewSize 682m

-XX:PermSize 2048m

-XX:ReservedCodeCacheSize 64M

-XX:SoftRefLRUPolicyMSPerMB 1

-XX:SurvivorRatio 2

-XX:TargetSurvivorRatio 90

We are running our b2b Shop on this server. I don´t know if the 4 GB are enough Memory for Java since we have 16 GB available within our machine. But I´d like to know if i can just increase the Heap Size to 8GB or more.

I´m looking forward to hear your recommendations.

best regards

Tobias

[Former Member]

It´s a dedicated machine with 16 GB Ram. Max Heap of the JVM Settings is 4 GB.

[Former Member]

Ok. Change the parameter as described in SAP note 723909.

Thanks

Sunny