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  * @test
  26  * @key stress gc randomness
  27  *
  28  * @summary converted from VM Testbase gc/memory/UniThread/Circular3.
  29  * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
  30  *
  31  * @library /vmTestbase
  32  *          /test/lib
  33  * @run driver jdk.test.lib.FileInstaller . .
  34  * @run main/othervm gc.memory.UniThread.Circular3.Circular3 -iterations 5
  35  */
  36 
  37 package gc.memory.UniThread.Circular3;
  38 
  39 import nsk.share.test.*;
  40 import nsk.share.gc.*;
  41 
  42 /**
  43  * Test GC collection of circular linked lists.
  44  *
  45  * This test simply creates a series of circulary
  46  * linked memory objects which should be able to be
  47  * GC'd.
  48  *
  49  * In this test the size of one object is small, the number
  50  * of objects in one list is small and the number
  51  * of lists is large. Also, the order in which references
  52  * are cleared is randomized.
  53  */
  54 public class Circular3 extends GCTestBase {
  55         private int arraySize;
  56         private int objectSize;
  57         private int circularitySize;
  58         private MemoryObject memoryArray[];
  59 
  60         public Circular3() {
  61                 this(100, 5);
  62         }
  63 
  64         public Circular3(int objectSize, int circularitySize) {
  65                 this.objectSize = objectSize;
  66                 this.circularitySize = circularitySize;
  67         }
  68 
  69         public void run() {
  70                 arraySize = Memory.getArrayLength(runParams.getTestMemory(), Memory.getListSize(circularitySize, objectSize));
  71                 log.debug("Array size: " + arraySize);
  72                 Stresser stresser = new Stresser(runParams.getStressOptions());
  73                 memoryArray = new MemoryObject[arraySize];
  74                 stresser.start(runParams.getIterations());
  75                 try {
  76                         while (stresser.iteration()) {
  77                                 log.debug(Runtime.getRuntime().freeMemory());
  78                                 for (int i = 0; i < arraySize && stresser.continueExecution(); i ++) {
  79                                         int index = LocalRandom.nextInt(arraySize);
  80                                         memoryArray[index] = Memory.makeCircularList(circularitySize, objectSize);
  81                                 }
  82                         }
  83                 } finally {
  84                         stresser.finish();
  85                 }
  86                 System.out.println("Test passed.");
  87         }
  88 
  89         public static void main(String args[]) {
  90                 GC.runTest(new Circular3(), args);
  91         }
  92 }