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Know your Default Initial and Max heap size of JVM

June 7, 2012 by kiranbadi1991 | Filed under Development, Environment, Memory, Others, Performance Engineering.

At times it becomes necessary that we know the default heap size allocated to the JVM in order to debug some issues, for those cases, I suggest run the below command on the command line of the server box to get this information,

java -XX:+PrintCommandLineFlags -version

 

On my machine, where I have tomcat server installed, I get the information something like,

 

C:\Users\kiran>java -XX:+PrintCommandLineFlags -version
-XX:InitialHeapSize=16777216 -XX:MaxHeapSize=268435456 -XX:+PrintCommandLineFlag
s -XX:-UseLargePagesIndividualAllocation
java version “1.6.0_32”
Java(TM) SE Runtime Environment (build 1.6.0_32-b05)
Java HotSpot(TM) Client VM (build 20.7-b02, mixed mode, sharing)

 

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