Increasing Heap Size on Linux Machines

Question

I work on Ubuntu desktop machine and I d like to increase heap size for Java  The RAM is 16GB and the current Max Heap Size is 3GB  I checked this post post Increasing Tomcat Heap Size  Not much found about Ubuntu  so I tried this command   java -Xmx10000m -X2000m -XshowSettings all   and the result is   Min Heap Size  1 95G Max Heap Size  9 77G   then sudo gedit  etc tomcat7 default  and changed this lino to   JAVA OPTS  -Djava awt headless true -Xmx10000m -XX MaxPermSize 2000m     but then I restarted the machine an checked the max size using   java -XshowSettings all   and this shows   Max Heap Size  Estimated   3 80GB   I wanted to take advantage of the high RAM i got  16 GB   Is there anything else i can do

User · Accepted Answer

Changing Tomcat config wont effect all JVM instances to get theses settings. This is not how it works, the setting will be used only to launch JVMs used by Tomcat, not started in the shell.

Look here for permanently changing the heap size.

User · Answer

You can use the following code snippet     java -XX  PrintFlagsFinal -Xms512m -Xmx1024m -Xss512k -XX PermSize 64m -XX MaxPermSize 128m     -version   grep -iE  HeapSize PermSize ThreadStackSize    In my pc I am getting following output         uintx InitialHeapSize                             536870912        product      uintx MaxHeapSize                                 1073741824       product      uintx PermSize                                    67108864         pd product      uintx MaxPermSize                                 134217728        pd product       intx ThreadStackSize                             512              pd product

[java] Increasing Heap Size on Linux Machines

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