Benefit of using forEachOrdered with Parallel streams

Question

The official Oracle documentation says:

Note that you may lose the benefits of parallelism if you use operations like forEachOrdered with parallel s

Answer 1

I found stream().forEachOrdered() is ~50% faster than its parallel counterpart. Plus the parallel one uses at least one thread from common fork-join thread pool, which is - one less thread for other parallel streams running in JVM.

public static void main(String[] args) { long start = System.currentTimeMillis(); IntStream.range(0,10000000).parallel().forEachOrdered(i -> { //System.out.println(Thread.currentThread().getName()); int p = 1 * 1 ; }); System.out.println((System.currentTimeMillis() - start)); }