JMH: don't take into account inner method time
benchmarking, java, jmh, microbenchmark
Solution
When in doubt, look through the JMH Samples. The effect you want is achieved by `@Setup` annotation over some fixture method, which will be run before the benchmark. The exact answer in JMH Samples is here.
Problem
I have: Methods like this: ``` @GenerateMicroBenchmark public static void calculateArraySummary(String[] args) { // create a random data set /* PROBLEM HERE: * now I measure not only pool.invoke(finder) time, * but also generateRandomArray method time */ final int[] array = generateRandomArray(1000000); // submit the task to the pool final ForkJoinPool pool = new ForkJoinPool(4); final ArraySummator finder = new ArraySummator(array); System.out.println(pool.invoke(finder)); } private static int[] generateRandomArray(int length) { final int[] array = new int[1000000]; final Random random = new Random(); for (int i = 0; i < array.length; i++) { array[i] = random.nextInt(100); } return array; } ``` Problem: I don't want my program take into account time spent by `generateRandomArray` method. Questuin: How can I exclude `generateRandomArray` from jmh measurements?