1 /*
   2  * Copyright (c) 2012, 2013, 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
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  23 
  24 /*
  25  * @test TestHumongousAllocInitialMark
  26  * @bug 7168848
  27  * @requires vm.gc=="G1" | vm.gc=="null"
  28  * @summary G1: humongous object allocations should initiate marking cycles when necessary
  29  * @library /testlibrary
  30  */
  31 
  32 import com.oracle.java.testlibrary.*;
  33 
  34 public class TestHumongousAllocInitialMark {
  35     private static final int heapSize                       = 200; // MB
  36     private static final int heapRegionSize                 = 1;   // MB
  37     private static final int initiatingHeapOccupancyPercent = 50;  // %
  38 
  39     public static void main(String[] args) throws Exception {
  40         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  41             "-XX:+UseG1GC",
  42             "-Xms" + heapSize + "m",
  43             "-Xmx" + heapSize + "m",
  44             "-XX:G1HeapRegionSize=" + heapRegionSize + "m",
  45             "-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent,
  46             "-XX:+PrintGC",
  47             HumongousObjectAllocator.class.getName());
  48 
  49         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  50         output.shouldContain("GC pause (G1 Humongous Allocation) (young) (initial-mark)");
  51         output.shouldNotContain("Full GC");
  52         output.shouldHaveExitValue(0);
  53     }
  54 
  55     static class HumongousObjectAllocator {
  56         private static byte[] dummy;
  57 
  58         public static void main(String [] args) throws Exception {
  59             // Make object size 75% of region size
  60             final int humongousObjectSize =
  61                 (int)(heapRegionSize * 1024 * 1024 * 0.75);
  62 
  63             // Number of objects to allocate to go above IHOP
  64             final int humongousObjectAllocations =
  65                 (int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1;
  66 
  67             // Allocate
  68             for (int i = 1; i <= humongousObjectAllocations; i++) {
  69                 System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations +
  70                                    " of size " + humongousObjectSize + " bytes");
  71                 dummy = new byte[humongousObjectSize];
  72             }
  73         }
  74     }
  75 }
  76