Find which garbage collector you are using through cmd and java program



Contents of page >
  • 1) Find which garbage collector you are using through cmd
  • 2) Find which garbage collector you are using through java program





1) Find which garbage collector you are using through cmd

Use java -XX:+PrintCommandLineFlags -version to find out which garbage collector you are using.

E:\>java -XX:+PrintCommandLineFlags -version
-XX:InitialHeapSize=266885312 -XX:MaxHeapSize=4270164992 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:-UseLargePagesIndividualAllocation -XX:+UseParallelGC
java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)

E:\>


Check out which garbage collector your system is using it may be Serial collector / Serial GC (Garbage collector) or




2) Find which garbage collector you are using through java program

import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.util.List;
public class FindGarbageCollectorWhichYouAreUsing {
   public static void main(String[] args) {
          try {
                 List<GarbageCollectorMXBean> getGarbageCollectorMXBeansList =

                                       ManagementFactory.getGarbageCollectorMXBeans();
                 System.out.println("Display garbage collector name > ");

                 for (GarbageCollectorMXBean getGarbageCollectorMXBeans :
                                                                                                                                                    
                                                    getGarbageCollectorMXBeansList) {
                       System.out.println(getGarbageCollectorMXBeans.getName());
                 }
          } catch (Exception exp) {
                 throw new RuntimeException(exp);
          }
   }
}


Above java program will display the garbage collector you are using.


Summary -

So in this core java tutorial we learned how to find out which garbage collector you are using through cmd and java program.


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RELATED LINKS>

Most important and frequently used VM (JVM) PARAMETERS with examples in JVM Heap memory in java


What are -Xms and -Xmx JVM parameters in java, And differences between them with examples


How to use -verbose:gc VM argument

How to use Jstat for monitoring the garbage collection in java






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