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 * @summary Exercise ExecutorCompletionService 38 * @library /test/lib 39 */ 40 41 import static java.util.concurrent.TimeUnit.MILLISECONDS; 42 43 import java.util.concurrent.Callable; 44 import java.util.concurrent.ExecutorCompletionService; 45 import java.util.concurrent.ExecutorService; 46 import java.util.concurrent.Executors; 47 import jdk.test.lib.Utils; 48 49 public class ExecutorCompletionServiceLoops { 50 static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000); 51 static final int POOLSIZE = 10; 52 static final ExecutorService pool = 53 Executors.newFixedThreadPool(POOLSIZE); 54 static final ExecutorCompletionService<Integer> ecs = 55 new ExecutorCompletionService<>(pool); 56 static boolean print = false; 57 58 public static void main(String[] args) throws Exception { 59 int max = 8; 60 int base = 2000; 61 62 if (args.length > 0) 63 max = Integer.parseInt(args[0]); 64 65 System.out.println("Warmup..."); 66 oneTest(base); 67 print = true; 68 69 for (int i = 1; i <= max; i += (i+1) >>> 1) { 70 System.out.print("n: " + i * base); 71 oneTest(i * base); 72 } 73 pool.shutdown(); 74 if (! pool.awaitTermination(LONG_DELAY_MS, MILLISECONDS)) 75 throw new Error(); 76 } 77 78 static class Task implements Callable<Integer> { 79 public Integer call() { 80 int s = 0; 81 int l = System.identityHashCode(this); 82 for (int i = 0; i < 5; ++i) { 83 l = LoopHelpers.compute2(l); 84 s += LoopHelpers.compute1(l); 85 } 86 return new Integer(s); 87 } 88 } 89 90 static class Producer implements Runnable { 91 final ExecutorCompletionService cs; 92 final int iters; 93 Producer(ExecutorCompletionService ecs, int i) { 94 cs = ecs; 95 iters = i; 96 } 97 public void run() { 98 for (int i = 0; i < iters; ++i) 99 ecs.submit(new Task()); 100 } 101 } 102 103 static void oneTest(int iters) throws Exception { 104 long startTime = System.nanoTime(); 105 new Thread(new Producer(ecs, iters)).start(); 106 107 int r = 0; 108 for (int i = 0; i < iters; ++i) 109 r += ecs.take().get().intValue(); 110 111 long elapsed = System.nanoTime() - startTime; 112 long tpi = elapsed/ iters; 113 114 if (print) 115 System.out.println("\t: " + LoopHelpers.rightJustify(tpi) + " ns per task"); 116 117 if (r == 0) // avoid overoptimization 118 System.out.println("useless result: " + r); 119 } 120 121 }