Measuring time spent on GC

by

I guess that when GC (Garbage Collector) is working the application stops and resumes when GC finishes

I don’t think that is a safe assumption. Are you sure the garbage collector is not working in parallel with your application code?

To measure the time spent in collecting garbage you can query the Garbage Collector MXBean.

Try this:

public static void main(String[] args)  {
    System.out.println("collectionTime = " + getGarbageCollectionTime());
}

private static long getGarbageCollectionTime() {
    long collectionTime = 0;
    for (GarbageCollectorMXBean garbageCollectorMXBean : ManagementFactory.getGarbageCollectorMXBeans()) {
        collectionTime += garbageCollectorMXBean.getCollectionTime();
    }
    return collectionTime;
}

More Related Contents:

  1. How ‘random’ is allocation of memory when I say “new Integer” in Java?
  2. How can I read a large text file line by line using Java?
  3. Java heap terminology: young, old and permanent generations?
  4. Does setting Java objects to null do anything anymore?
  5. GC overhead limit exceeded
  6. How can I avoid garbage collection delays in Java games? (Best Practices) [closed]
  7. When will JVM use intrinsics
  8. Analyzing gc logs
  9. Which loop has better performance? Why?
  10. Garbage collection behaviour for String.intern()
  11. Size of Huge Objects directly allocated to Old Generation
  12. Know of any Java garbage collection log analysis tools? [closed]
  13. Why does the JVM require warmup?
  14. Support for Compressed Strings being Dropped in HotSpot JVM?
  15. Garbage collection on intern’d strings, String Pool, and perm-space
  16. How to calculate HashMap memory usage in Java?
  17. Why defining class as final improves JVM performance?
  18. Java Collections and Garbage Collector
  19. What is the Metadata GC Threshold and how do I tune it?
  20. Is the garbage collector guaranteed to run before Out of Memory Error?
  21. Java very large heap sizes [closed]
  22. What GC parameters is a JVM running with?
  23. Why is the 64bit JVM faster than the 32bit one?
  24. Does GC release back memory to OS?
  25. Differences between “java -cp” and “java -jar”?
  26. Java: Which of multiple resources on classpath JVM takes?
  27. Java Performance Testing [duplicate]
  28. Java compile speed vs Scala compile speed
  29. How can I specify the default JVM arguments for programs I run from eclipse?
  30. Why is reflection slow?

Leave a Comment