TestHumongousAllocInitialMark.java revision 8359:ed6389f70257 
1/*
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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.
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22 */
23
24/*
25 * @test TestHumongousAllocInitialMark
26 * @bug 7168848
27 * @summary G1: humongous object allocations should initiate marking cycles when necessary
28 * @library /testlibrary
29 * @modules java.base/sun.misc
30 *          java.management
31 */
32
33import jdk.test.lib.*;
34
35public class TestHumongousAllocInitialMark {
36    // Heap sizes < 224 MB are increased to 224 MB if vm_page_size == 64K to
37    // fulfill alignment constraints.
38    private static final int heapSize                       = 224; // MB
39    private static final int heapRegionSize                 = 1;   // MB
40    private static final int initiatingHeapOccupancyPercent = 50;  // %
41
42    public static void main(String[] args) throws Exception {
43        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
44            "-XX:+UseG1GC",
45            "-Xms" + heapSize + "m",
46            "-Xmx" + heapSize + "m",
47            "-XX:G1HeapRegionSize=" + heapRegionSize + "m",
48            "-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent,
49            "-XX:+PrintGC",
50            HumongousObjectAllocator.class.getName());
51
52        OutputAnalyzer output = new OutputAnalyzer(pb.start());
53        output.shouldContain("GC pause (G1 Humongous Allocation) (young) (initial-mark)");
54        output.shouldNotContain("Full GC");
55        output.shouldHaveExitValue(0);
56    }
57
58    static class HumongousObjectAllocator {
59        private static byte[] dummy;
60
61        public static void main(String [] args) throws Exception {
62            // Make object size 75% of region size
63            final int humongousObjectSize =
64                (int)(heapRegionSize * 1024 * 1024 * 0.75);
65
66            // Number of objects to allocate to go above IHOP
67            final int humongousObjectAllocations =
68                (int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1;
69
70            // Allocate
71            for (int i = 1; i <= humongousObjectAllocations; i++) {
72                System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations +
73                                   " of size " + humongousObjectSize + " bytes");
74                dummy = new byte[humongousObjectSize];
75            }
76        }
77    }
78}
79
80