1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 */ 22 23 /* 24 * This file is available under and governed by the GNU General Public 25 * License version 2 only, as published by the Free Software Foundation. 26 * However, the following notice accompanied the original version of this 27 * file: 28 * 29 * Written by Doug Lea with assistance from members of JCP JSR-166 30 * Expert Group and released to the public domain, as explained at 31 * http://creativecommons.org/publicdomain/zero/1.0/ 32 */ 33 34 /* 35 * @test 36 * @bug 4965960 37 * @compile ExecutorCompletionServiceLoops.java 38 * @run main/timeout=3600 ExecutorCompletionServiceLoops 39 * @summary Exercise ExecutorCompletionServiceLoops 40 */ 41 42 import java.util.concurrent.*; 43 44 public class ExecutorCompletionServiceLoops { 45 static final int POOLSIZE = 100; 46 static final ExecutorService pool = 47 Executors.newFixedThreadPool(POOLSIZE); 48 static final ExecutorCompletionService<Integer> ecs = 49 new ExecutorCompletionService<Integer>(pool); 50 static boolean print = false; 51 52 public static void main(String[] args) throws Exception { 53 int max = 8; 54 int base = 10000; 55 56 if (args.length > 0) 57 max = Integer.parseInt(args[0]); 58 59 System.out.println("Warmup..."); 60 oneTest( base ); 61 Thread.sleep(100); 62 print = true; 63 64 for (int i = 1; i <= max; i += (i+1) >>> 1) { 65 System.out.print("n: " + i * base); 66 oneTest(i * base ); 67 Thread.sleep(100); 68 } 69 pool.shutdown(); 70 if (! pool.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS)) 71 throw new Error(); 72 } 73 74 static class Task implements Callable<Integer> { 75 public Integer call() { 76 int s = 0; 77 int l = System.identityHashCode(this); 78 for (int i = 0; i < 5; ++i) { 79 l = LoopHelpers.compute2(l); 80 s += LoopHelpers.compute1(l); 81 } 82 return new Integer(s); 83 } 84 } 85 86 static class Producer implements Runnable { 87 final ExecutorCompletionService cs; 88 final int iters; 89 Producer(ExecutorCompletionService ecs, int i) { 90 cs = ecs; 91 iters = i; 92 } 93 public void run() { 94 for (int i = 0; i < iters; ++i) 95 ecs.submit(new Task()); 96 } 97 } 98 99 static void oneTest(int iters) throws Exception { 100 long startTime = System.nanoTime(); 101 new Thread(new Producer(ecs, iters)).start(); 102 103 int r = 0; 104 for (int i = 0; i < iters; ++i) 105 r += ecs.take().get().intValue(); 106 107 long elapsed = System.nanoTime() - startTime; 108 long tpi = elapsed/ iters; 109 110 if (print) 111 System.out.println("\t: " + LoopHelpers.rightJustify(tpi) + " ns per task"); 112 113 if (r == 0) // avoid overoptimization 114 System.out.println("useless result: " + r); 115 116 117 } 118 119 }