1 /*
   2  * Copyright (c) 2007, 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 package vm.gc.compact;
  24 
  25 import java.util.*;
  26 
  27 import java.util.concurrent.atomic.AtomicInteger;
  28 import nsk.share.test.*;
  29 import nsk.share.gc.*;
  30 import nsk.share.gc.gp.*;
  31 
  32 /**
  33  * Test garbage collector compaction.
  34  *
  35  * The test starts several threads which create objects using
  36  * given garbage producer until OOM. The references are kept
  37  * in an array. The references to even elements are cleared
  38  * and objects of larger size are created until OOM. The garbage
  39  * collector will have to compact free space to free memory for
  40  * new objects.
  41  *
  42  * The size of the second half of created objects could be set explictly.
  43  *
  44  * This process is repeated.
  45  */
  46 public class Compact extends ThreadedGCTest implements GarbageProducerAware, GarbageProducer1Aware, MemoryStrategyAware {
  47 
  48     private GarbageProducer garbageProducer;
  49     private GarbageProducer garbageProducer1;
  50     private MemoryStrategy memoryStrategy;
  51     private long size;
  52     private long size2;
  53     private static long customSize = 0;
  54     static AtomicInteger allocations = new AtomicInteger();
  55 
  56     private class Worker implements Runnable {
  57 
  58         private List<Object> bricks;
  59         private ExecutionController stresser;
  60 
  61         public void run() {
  62             if (stresser == null) {
  63                 stresser = getExecutionController();
  64             }
  65             try {
  66                 bricks = new ArrayList<Object>();
  67                 while (stresser.continueExecution()) {
  68                     bricks.add(garbageProducer.create(size));
  69                 }
  70             } catch (OutOfMemoryError e) {
  71             }
  72             if (bricks == null) {
  73                 return;
  74             }
  75             int count = bricks.size();
  76             for (int i = 0; stresser.continueExecution() && i < count; i += 2) {
  77                 bricks.set(i, null);
  78             }
  79             try {
  80                 for (int i = 0; stresser.continueExecution() && i < count; i += 2) {
  81                     bricks.set(i, garbageProducer1.create(size2));
  82                     allocations.incrementAndGet();
  83                 }
  84             } catch (OutOfMemoryError e) {
  85             }
  86             bricks = null;
  87         }
  88     }
  89 
  90     public Runnable createRunnable(int i) {
  91         return new Worker();
  92     }
  93 
  94     public void run() {
  95         size = memoryStrategy.getSize(runParams.getTestMemory());
  96         size2 = customSize == 0
  97                 ? size2 = size * 2
  98                 : customSize;
  99         super.run();
 100     }
 101 
 102     public final void setGarbageProducer(GarbageProducer garbageProducer) {
 103         this.garbageProducer = garbageProducer;
 104     }
 105 
 106     public final void setGarbageProducer1(GarbageProducer garbageProducer1) {
 107         this.garbageProducer1 = garbageProducer1;
 108     }
 109 
 110     public final void setMemoryStrategy(MemoryStrategy memoryStrategy) {
 111         this.memoryStrategy = memoryStrategy;
 112     }
 113 
 114     static void setHumongousSizeFromParams(String[] args) {
 115         for (int i = 0; i < args.length; ++i) {
 116             if (args[i].equals("-size2")) {
 117                 customSize = Long.parseLong(args[i + 1]);
 118                 return;
 119             }
 120         }
 121     }
 122 
 123     public static void main(String[] args) {
 124         setHumongousSizeFromParams(args);
 125         GC.runTest(new Compact(), args);
 126     }
 127 }