OnJava8-Examples/validating/BadMicroBenchmark2.java at master · xinan-w/OnJava8-Examples · GitHub

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// validating/BadMicroBenchmark2.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Relying on a common resource

import java.util.*;

import onjava.Timer;

public class BadMicroBenchmark2 {

// SIZE reduced to make it run faster:

static final int SIZE = 5_000_000;

public static void main(String[] args) {

long[] la = new long[SIZE];

Random r = new Random();

System.out.println("parallelSetAll: " +

Timer.duration(() ->

Arrays.parallelSetAll(la, n -> r.nextLong())));

System.out.println("setAll: " +

Timer.duration(() ->

Arrays.setAll(la, n -> r.nextLong())));

SplittableRandom sr = new SplittableRandom();

System.out.println("parallelSetAll: " +

Timer.duration(() ->

Arrays.parallelSetAll(la, n -> sr.nextLong())));

System.out.println("setAll: " +

Timer.duration(() ->

Arrays.setAll(la, n -> sr.nextLong())));

}

/* Output:

parallelSetAll: 1008

setAll: 294

parallelSetAll: 78

setAll: 88

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