Java Garbage Collectors

Common Java Heap Memory Related Options

Option Description
-Xms Sets the initial heap size for when the JVM starts.
-Xmx Sets the maximum heap size.
-Xmn Sets the size of the Young Generation.
-XX:PermSize Sets the starting size of the Permanent Generation.
-XX:MaxPermSize Sets the maximum size of the Permanent Generation
A sample command line for starting the JavaDemo:
 java -Xmx12m -Xms3m -Xmn1m -XX:PermSize=20m -XX:MaxPermSize=20m -jar c:\myworkspace\Javademo.jar

Java Garbage Collector Types

1.The Serial GC
2.The Parallel GC
3.The Concurrent Mark Sweep (CMS) Collector.

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