worker jvm setting

[jinhong lu]

Hi, all,

My worker jvm setting is:  
worker.childopts  "-Xmx2048m -Xms2048m -Xmn786m -XX:PermSize=128m 
-XX:+UseConcMarkSweepGC"

But I found the the oldsize is 5m, it cause a lot of full GC. what is the 
problem? 
hadoop@gdc-storm07-storm:~/var$ jmap -heap 28430

Heap Configuration:
   MinHeapFreeRatio = 40
   MaxHeapFreeRatio = 70
   MaxHeapSize      = 2147483648 (2048.0MB)
   NewSize          = 824180736 (786.0MB)
   MaxNewSize       = 824180736 (786.0MB)
   OldSize          = 5439488 (5.1875MB)
   NewRatio         = 2
   SurvivorRatio    = 8
   PermSize         = 134217728 (128.0MB)
   MaxPermSize      = 134217728 (128.0MB)
   G1HeapRegionSize = 0 (0.0MB)
thanks.

lujinhong