Beispiel #1
0
 /** getPoolSize returns number of started workers. */
 public void testGetPoolSize() {
   final CountDownLatch taskStarted = new CountDownLatch(1);
   final CountDownLatch done = new CountDownLatch(1);
   final ForkJoinPool p = new ForkJoinPool(1);
   try (PoolCleaner cleaner = cleaner(p)) {
     assertEquals(0, p.getActiveThreadCount());
     final Runnable task =
         new CheckedRunnable() {
           public void realRun() throws InterruptedException {
             taskStarted.countDown();
             assertEquals(1, p.getPoolSize());
             assertEquals(1, p.getActiveThreadCount());
             done.await();
           }
         };
     Future<?> future = p.submit(task);
     await(taskStarted);
     assertEquals(1, p.getPoolSize());
     assertEquals(1, p.getActiveThreadCount());
     done.countDown();
   }
   assertEquals(0, p.getPoolSize());
   assertEquals(0, p.getActiveThreadCount());
 }
Beispiel #2
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 static void test(ForkJoinPool pool, int num) throws Exception {
   int ps = pool.getParallelism();
   long start = System.nanoTime();
   DynamicFib f = new DynamicFib(num);
   pool.invoke(f);
   long time = System.nanoTime() - start;
   double secs = ((double) time) / NPS;
   long result = f.number;
   System.out.print("DynamicFib " + num + " = " + result);
   System.out.printf("\tTime: %9.3f", secs);
   long sc = pool.getStealCount();
   long ns = sc - lastStealCount;
   lastStealCount = sc;
   System.out.printf(" Steals: %4d", ns / ps);
   System.out.printf(" Workers: %4d", pool.getPoolSize());
   System.out.println();
 }
Beispiel #3
0
 // 16、实现showLog()方法,接受一个ForkJoinPool对象作为参数,输出关于它的状态信息及线程、任务的执行信息
 private static void showLog(ForkJoinPool pool) {
   System.out.printf("**********************\n");
   System.out.printf("Main: Fork/Join Pool log\n");
   System.out.printf("Main: Fork/Join Pool: Parallelism: %d\n", pool.getParallelism());
   System.out.printf("Main: Fork/Join Pool: Pool Size: %d\n", pool.getPoolSize());
   System.out.printf(
       "Main: Fork/Join Pool: Active Thread Count: %d\n", pool.getActiveThreadCount());
   System.out.printf(
       "Main: Fork/Join Pool: Running Thread Count: %d\n", pool.getRunningThreadCount());
   System.out.printf(
       "Main: Fork/Join Pool: Queued Submission: %d\n", pool.getQueuedSubmissionCount());
   System.out.printf("Main: Fork/Join Pool: Queued Tasks: %d\n", pool.getQueuedTaskCount());
   System.out.printf(
       "Main: Fork/Join Pool: Queued Submissions: %s\n", pool.hasQueuedSubmissions());
   System.out.printf("Main: Fork/Join Pool: Steal Count: %d\n", pool.getStealCount());
   System.out.printf("Main: Fork/Join Pool: Terminated : %s\n", pool.isTerminated());
   System.out.printf("**********************\n");
 }