Why is Arrays.setAll faster than Arrays.parallelSetAll in this case?
int[] array = new int[30000000];
Random rnd = new Random();
Arrays.parallelSetAll(array, i->rnd.nextInt(200));
Why is Arrays.setAll faster than Arrays.parallelSetAll in this case?
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1 Answers
From the javadoc:
Instances of java.util.Random are threadsafe. However, the concurrent use of the same java.util.Random instance across threads may encounter contention and consequent poor performance. Consider instead using ThreadLocalRandom in multithreaded designs.
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