1 /*
   2  * Copyright (c) 2002, 2018, 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 gc
  28  *
  29  * @summary converted from VM Testbase gc/memory/Churn/Churn4.
  30  * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
  31  *
  32  * @library /vmTestbase
  33  *          /test/lib
  34  * @run driver jdk.test.lib.FileInstaller . .
  35  * @run main/othervm gc.memory.Churn.Churn4.Churn4
  36  */
  37 
  38 package gc.memory.Churn.Churn4;
  39 
  40 import nsk.share.test.*;
  41 import nsk.share.gc.*;
  42 
  43 /**
  44  *  Test that GC works with memory that is churn over.
  45  *
  46  *  This test starts a number of threads that create objects,
  47  *  keep references to them in array and overwrite them.
  48  *  The test checks that GC is able to collect these objects.
  49  *
  50  *  This test is the same as Churn1 except that it creates objects
  51  *  1/10 of which will have non-trivial finalizer.
  52  *
  53  *  @see gc.memory.Churn.Churn1.Churn1
  54  */
  55 public class Churn4 extends ThreadedGCTest {
  56         private int multiplier = 10;
  57         private int sizeOfArray;
  58 
  59         private class ThreadObject implements Runnable {
  60                 private MemoryObject[] objectArray = new MemoryObject[sizeOfArray];
  61                 int allocationMod = 0;
  62                 int allocationModulus = 10;
  63 
  64                 public ThreadObject() {
  65                         for (int i = 0; i < sizeOfArray; i ++) {
  66                                 if (allocationMod == 0)
  67                                         objectArray[i] = new FinMemoryObject(multiplier);
  68                                 else
  69                                         objectArray[i] = new FinMemoryObject1(multiplier * i);
  70                                 allocationMod++;
  71                                 allocationMod %= allocationModulus;
  72                         }
  73                 }
  74 
  75                 public void run() {
  76                         int index = LocalRandom.nextInt(sizeOfArray);
  77                         objectArray[index] = new FinMemoryObject1(multiplier * index);
  78                         allocationMod++;
  79                         allocationMod %= allocationModulus;
  80                 }
  81         }
  82 
  83         protected Runnable createRunnable(int i) {
  84                 return new ThreadObject();
  85         }
  86 
  87         public void run() {
  88                 sizeOfArray = (int) Math.min(Math.sqrt(runParams.getTestMemory() * 2 / runParams.getNumberOfThreads() / multiplier), Integer.MAX_VALUE);
  89                 System.out.println("Size of array: " + sizeOfArray);
  90                 super.run();
  91         }
  92 
  93         public static void main(String args[]) {
  94                 GC.runTest(new Churn4(), args);
  95         }
  96 }