| /* |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| */ |
| |
| /* |
| * @test |
| * @bug 4965960 |
| * @summary Exercise ExecutorCompletionService |
| * @library /lib/testlibrary/ |
| */ |
| |
| import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorCompletionService; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import jdk.testlibrary.Utils; |
| |
| public class ExecutorCompletionServiceLoops { |
| static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000); |
| static final int POOLSIZE = 10; |
| static final ExecutorService pool = |
| Executors.newFixedThreadPool(POOLSIZE); |
| static final ExecutorCompletionService<Integer> ecs = |
| new ExecutorCompletionService<Integer>(pool); |
| static boolean print = false; |
| |
| public static void main(String[] args) throws Exception { |
| int max = 8; |
| int base = 2000; |
| |
| if (args.length > 0) |
| max = Integer.parseInt(args[0]); |
| |
| System.out.println("Warmup..."); |
| oneTest(base); |
| print = true; |
| |
| for (int i = 1; i <= max; i += (i+1) >>> 1) { |
| System.out.print("n: " + i * base); |
| oneTest(i * base); |
| } |
| pool.shutdown(); |
| if (! pool.awaitTermination(LONG_DELAY_MS, MILLISECONDS)) |
| throw new Error(); |
| } |
| |
| static class Task implements Callable<Integer> { |
| public Integer call() { |
| int s = 0; |
| int l = System.identityHashCode(this); |
| for (int i = 0; i < 5; ++i) { |
| l = LoopHelpers.compute2(l); |
| s += LoopHelpers.compute1(l); |
| } |
| return new Integer(s); |
| } |
| } |
| |
| static class Producer implements Runnable { |
| final ExecutorCompletionService cs; |
| final int iters; |
| Producer(ExecutorCompletionService ecs, int i) { |
| cs = ecs; |
| iters = i; |
| } |
| public void run() { |
| for (int i = 0; i < iters; ++i) |
| ecs.submit(new Task()); |
| } |
| } |
| |
| static void oneTest(int iters) throws Exception { |
| long startTime = System.nanoTime(); |
| new Thread(new Producer(ecs, iters)).start(); |
| |
| int r = 0; |
| for (int i = 0; i < iters; ++i) |
| r += ecs.take().get().intValue(); |
| |
| long elapsed = System.nanoTime() - startTime; |
| long tpi = elapsed/ iters; |
| |
| if (print) |
| System.out.println("\t: " + LoopHelpers.rightJustify(tpi) + " ns per task"); |
| |
| if (r == 0) // avoid overoptimization |
| System.out.println("useless result: " + r); |
| } |
| |
| } |