Question

可能重复：
“Parallel.For” for Java?

.NET具有Parallel.For，它允许您并行运行for循环，而无需直接使用线程。

Java中有类似的东西吗？我找到了完全相同的问题（Here），但是在最新版本的Java出现之前就被问到了，它声称有：

“JSR 166下的并发实用程序”

那么，他们放了什么东西吗？

Answer 1

虽然可以建议Parallel.For与ExecutorService.submit类似，但我怀疑它不是。

public static void main(String... args) throws InterruptedException {
    long start1 = System.nanoTime();
    int runs1 = 1000;
    final int[] a = new int[100];
    for (int j = 0; j < runs1; j++) {
        for (int i = 0; i < 100; i++) {
            a[i] = a[i] * a[i];
        }
    }
    long time1 = System.nanoTime() - start1;
    System.out.printf("Each loop took an average of %,d micro-seconds%n", time1 / runs1 / 1000);

    int processors = Runtime.getRuntime().availableProcessors();
    long start2 = System.nanoTime();
    ExecutorService executor = Executors.newFixedThreadPool(processors);
    for (int j = 0; j < runs1; j++) {
        for (int i = 0; i < 100; i++) {
            final int i2 = i;
            executor.submit(new Runnable() {
                public void run() {
                    a[i2] = a[i2] * a[i2];
                }
            });
        }
    }
    executor.shutdown();
    executor.awaitTermination(1, TimeUnit.SECONDS);
    long time2 = System.nanoTime() - start2;
    System.out.printf("Parallel: Each loop took an average of %,d micro-seconds%n", time2 / runs1 / 1000);
}

打印

Each loop took an average of 2 micro-seconds
Parallel: Each loop took an average of 149 micro-seconds

这表明在这个例子中，使用多个线程是非常糟糕的主意。所以我希望循环效率稍高一些

    for (int j = 0; j < runs1; j++) {
        for (int i = 0; i < processors; i++) {
            final int i2 = i;
            executor.submit(new Runnable() {
                public void run() {
                    for (int i3 = i2 * 100 / processors; i3 < (i2 + 1) * 100 / processors && i3 < 100; i3++)
                        a[i2] = a[i2] * a[i2];
                }
            });
        }
    }

打印

Parallel: Each loop took an average of 28 micro-seconds

如果你认为Runnable中的代码不是线程安全的，我怀疑Parallel.For做了一些相当不同的事情，或者说它毫无意义。

Answer 2

Fork / Join Framework应该包含在Java 8中，还有lambdas / closures ......最近，Java冠军之一Angelika Langer就这个主题发表了很好的演讲

Answer 3

我的并行计算教授Alan Kaminsky和他的一群研究生已经编写了一个具有您所需功能的库。

信息页面涵盖了Javadocs，许可证，下载，甚至免费书籍。

它是GNU GPL版本3下的自由软件。

Parallel Java 2 Library

Parallel.For用Java？

3 个答案: