1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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  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).
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  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  * @summary G1: humongous object allocations should initiate marking cycles when necessary
  28  * @requires vm.gc.G1
  29  * @library /test/lib
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  */
  33 
  34 import jdk.test.lib.process.OutputAnalyzer;
  35 import jdk.test.lib.process.ProcessTools;
  36 
  37 public class TestHumongousAllocInitialMark {
  38     // Heap sizes < 224 MB are increased to 224 MB if vm_page_size == 64K to
  39     // fulfill alignment constraints.
  40     private static final int heapSize                       = 224; // MB
  41     private static final int heapRegionSize                 = 1;   // MB
  42     private static final int initiatingHeapOccupancyPercent = 50;  // %
  43 
  44     public static void main(String[] args) throws Exception {
  45         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  46             "-XX:+UseG1GC",
  47             "-Xms" + heapSize + "m",
  48             "-Xmx" + heapSize + "m",
  49             "-XX:G1HeapRegionSize=" + heapRegionSize + "m",
  50             "-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent,
  51             "-Xlog:gc",
  52             HumongousObjectAllocator.class.getName());
  53 
  54         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  55         output.shouldContain("Pause Initial Mark (G1 Humongous Allocation)");
  56         output.shouldNotContain("Full GC");
  57         output.shouldHaveExitValue(0);
  58     }
  59 
  60     static class HumongousObjectAllocator {
  61         private static byte[] dummy;
  62 
  63         public static void main(String [] args) throws Exception {
  64             // Make object size 75% of region size
  65             final int humongousObjectSize =
  66                 (int)(heapRegionSize * 1024 * 1024 * 0.75);
  67 
  68             // Number of objects to allocate to go above IHOP
  69             final int humongousObjectAllocations =
  70                 (int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1;
  71 
  72             // Allocate
  73             for (int i = 1; i <= humongousObjectAllocations; i++) {
  74                 System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations +
  75                                    " of size " + humongousObjectSize + " bytes");
  76                 dummy = new byte[humongousObjectSize];
  77             }
  78         }
  79     }
  80 }
  81