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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  23 
  24 /*
  25  * @test TestHumongousAllocInitialMark
  26  * @bug 7168848
  27  * @summary G1: humongous object allocations should initiate marking cycles when necessary
  28  * @library /testlibrary
  29  */
  30 
  31 import com.oracle.java.testlibrary.*;
  32 
  33 public class TestHumongousAllocInitialMark {
  34     // Heap sizes < 224 MB are increased to 224 MB if vm_page_size == 64K to
  35     // fulfill alignment constraints.
  36     private static final int heapSize                       = 224; // MB
  37     private static final int heapRegionSize                 = 1;   // MB
  38     private static final int initiatingHeapOccupancyPercent = 50;  // %
  39 
  40     public static void main(String[] args) throws Exception {
  41         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  42             "-XX:+UseG1GC",
  43             "-Xms" + heapSize + "m",
  44             "-Xmx" + heapSize + "m",
  45             "-XX:G1HeapRegionSize=" + heapRegionSize + "m",
  46             "-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent,
  47             "-XX:+PrintGC",
  48             HumongousObjectAllocator.class.getName());
  49 
  50         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  51         output.shouldContain("GC pause (G1 Humongous Allocation) (young) (initial-mark)");
  52         output.shouldNotContain("Full GC");
  53         output.shouldHaveExitValue(0);
  54     }
  55 
  56     static class HumongousObjectAllocator {
  57         private static byte[] dummy;
  58 
  59         public static void main(String [] args) throws Exception {
  60             // Make object size 75% of region size
  61             final int humongousObjectSize =
  62                 (int)(heapRegionSize * 1024 * 1024 * 0.75);
  63 
  64             // Number of objects to allocate to go above IHOP
  65             final int humongousObjectAllocations =
  66                 (int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1;
  67 
  68             // Allocate
  69             for (int i = 1; i <= humongousObjectAllocations; i++) {
  70                 System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations +
  71                                    " of size " + humongousObjectSize + " bytes");
  72                 dummy = new byte[humongousObjectSize];
  73             }
  74         }
  75     }
  76 }
  77