Method main

concurrent/Summing2.java:21–36

(String[] args)

  public static final long CHECK =
    (long)SZ * ((long)SZ + 1)/2;
  public static void main(String[] args) {
    System.out.println(CHECK);
    long[] la = new long[SZ+1];
    Arrays.parallelSetAll(la, i -> i);
    Summing.timeTest("Array Stream Sum", CHECK, () ->
      Arrays.stream(la).sum());
    Summing.timeTest("Parallel", CHECK, () ->
      Arrays.stream(la).parallel().sum());
    Summing.timeTest("Basic Sum", CHECK, () ->
      basicSum(la));
    // Destructive summation:
    Summing.timeTest("parallelPrefix", CHECK, () -> {
      Arrays.parallelPrefix(la, Long::sum);
      return la[la.length - 1];
    });
  }
}
/* Output:
200000010000000