Benchmarking inside Java code

by

Yes it is possible to effectively implement performance benchmarks in java code. The important question is that any kind of performance benchmark is going to add its own overhead and how much of it do you want. System.currentMill..() is good enough benchmark for performance and in most of the cases nanoTime() is an overkill.

For memory System.gc will show you varied results for different runs (as gc run is never guranteed.) I generally use Visual VM for memory profiling (its free) and then use TDA for dumps analyzing.

One way to do it less invasively is using Aspect oriented programing. You can create just one Aspect that runs on a particular Annotation or set of methods and write an @Around advice to collect performance data.

Here is a small snippet:

public class TestAspect {

    @LogPerformance
    public void thisMethodNeedsToBeMonitored(){
        // Do Something
    }
    public void thisMethodNeedsToBeMonitoredToo(){
        // Do Something
    } 
}

@interface LogPerformance{}

@Aspect
class PerformanceAspect{
    @Around("the pointcut expression to pick up all " +
            "the @PerfMonitor annotated methods")
    public void logPerformance(){
        // log performance here
        // Log it to a file
    }
}

More Related Contents:

  1. What is microbenchmarking?
  2. Java benchmarking – why is the second loop faster?
  3. Is it possible to force an existing Java application to use no more than x cores?
  4. Performance of java if-else with return statement [duplicate]
  5. How can I read a large text file line by line using Java?
  6. Array or List in Java. Which is faster?
  7. What is the relative performance difference of if/else versus switch statement in Java?
  8. Java 8: performance of Streams vs Collections
  9. Does Java casting introduce overhead? Why?
  10. Size of a byte in memory – Java
  11. Map.clear() vs new Map : Which one will be better? [duplicate]
  12. Efficiently compute Intersection of two Sets in Java?
  13. Counting the number of files in a directory using Java
  14. Can I improve performance of this regular expression further
  15. How to efficiently remove all null elements from a ArrayList or String Array?
  16. java how expensive is a method call
  17. Which part of throwing an Exception is expensive?
  18. Is Java really slow?
  19. Why does Java switch on contiguous ints appear to run faster with added cases?
  20. Java Performance Testing [duplicate]
  21. Efficiently color cycling an image in Java
  22. Java compile speed vs Scala compile speed
  23. Java Streams: How to do an efficient “distinct and sort”?
  24. Is there a memory-efficient replacement of java.lang.String?
  25. Why is reflection slow?
  26. Which one to use, int or Integer
  27. Performance of WebView in JavaFX
  28. Big execution time difference between java Lambda vs Anonymous class
  29. Will using longs instead of ints benefit in 64bit java
  30. What GC parameters is a JVM running with?

Leave a Comment