Create quick/reliable benchmark with java?

Question

I\'m trying to create a benchmark test with java. Currently I have the following simple method:

public static long runTest(int times){
    long start = Syste         


        

Answer 1

Your code ends up testing mainly garbage collection performance because appending to a String in a loop ends up creating and immediately discarding a large number of increasingly large String objects.

This is something that inherently leads to wildly varying measurements and is influenced strongy by multi-thread activity.

I suggest you do something else in your loop that has more predictable performance, like mathematical calculations.