1 /* 2 * Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 /* 26 * @test 27 * @key stress randomness 28 * 29 * @summary converted from VM Testbase gc/memory/Churn/Churn1. 30 * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent] 31 * 32 * @library /vmTestbase 33 * /test/lib 34 * @run main/othervm gc.memory.Churn.Churn1.Churn1 35 */ 36 37 package gc.memory.Churn.Churn1; 38 39 import nsk.share.test.*; 40 import nsk.share.gc.*; 41 42 /** 43 * Test that GC works with memory that is churn over. 44 * 45 * This test starts a number of threads that create objects, 46 * keep references to them in array and overwrite them. The test 47 * test checks that GC is able to collect these objects. 48 * 49 * This test will adjust the size of allocated objects to run 50 * environment. 51 * 52 * @see nsk.share.gc.RunParams#getTestMemory() 53 */ 54 public class Churn1 extends ThreadedGCTest { 55 private int multiplier = 10; 56 private int sizeOfArray; 57 58 class ThreadObject implements Runnable { 59 private AllMemoryObject objectArray[] = new AllMemoryObject[sizeOfArray]; 60 ThreadObject()61 public ThreadObject() { 62 for (int i = 0; i < sizeOfArray; i ++) 63 objectArray[i] = new AllMemoryObject(multiplier * i); 64 } 65 run()66 public void run() { 67 int index = LocalRandom.nextInt(sizeOfArray); 68 objectArray[index] = new AllMemoryObject(multiplier * index); 69 } 70 } 71 createRunnable(int i)72 protected Runnable createRunnable(int i) { 73 return new ThreadObject(); 74 } run()75 public void run() { 76 sizeOfArray = (int) Math.min(Math.sqrt(runParams.getTestMemory() * 2 / runParams.getNumberOfThreads() / multiplier), Integer.MAX_VALUE); 77 super.run(); 78 } 79 main(String args[])80 public static void main(String args[]) { 81 GC.runTest(new Churn1(), args); 82 } 83 } 84