Survivor Space not getting used in JVM

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Below is my GC settings in my 32 bit Linux Server of Quad Core processor of 2 GB RAM

After setting this , my Survivor Space is not at all getting used and Major GC happening on every 5 to 10 mins for 1 to 2 mins.

-XX:MaxNewSize=1024M
-XX:MaxPermSize=256M
-XX:NewSize=1024M
-XX:SurvivorRatio=6
-Xms1792M
-Xmx1792M
-XX:+UseCMSInitiatingOccupancyOnly
-XX:+UseConcMarkSweepGC
-XX:-UseAdaptiveSizePolicy
-XX:CMSInitiatingOccupancyFraction=60

Kindly check and let me know why the Survivor Space is not getting used and Major GC happening for every 10 mins.

Posted 24-Apr-13 7:46am

sunsecurity84

Updated 24-Apr-13 7:50am

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**Zoltán Zörgő** · Answer 1 · 2013-04-24T08:26:00

I am not a java gc guru, but I know that these settings alone won't make you happy or sad, since everything depends on the memory usage. Your 2GiB RAM is much likely too small. But nobody can tell more without detailed memory usage statistics. First of all, I suggest you consult following article: http://www.curiousmentality.co.uk/2011/11/tuning-jvm-memory-settings/[^] . Use the VisualVM for gathering data.

TorstenH. · Answer 2 · 2013-04-24T21:18:00

Read about the heap space[^]

Read about Garbage Collector[^]

If your app does not have "surviving pojos", then the heap's Survivor Space is not used.
Survivors are a typical problem when using JNI to connect to some C Coding and a reference to that system (e.g. a pointer there) is held.

You can request the GC to run, that is not considered to be that evil. Although it's best to not need to request the GC to run.

Survivor Space not getting used in JVM

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