TestHumongousAllocNearlyFullRegion.java revision 9727:f944761a3ce3 
1/*
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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22 */
23
24/*
25 * @test TestHumongousAllocNearlyFullRegion
26 * @bug 8143587
27 * @summary G1: humongous object allocations should work even when there is
28 *              not enough space in the heapRegion to fit a filler object.
29 * @library /testlibrary
30 * @run driver TestHumongousAllocNearlyFullRegion
31 */
32
33import jdk.test.lib.*;
34
35public class TestHumongousAllocNearlyFullRegion {
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
41    public static void main(String[] args) throws Exception {
42        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
43            "-XX:+UseG1GC",
44            "-Xms" + heapSize + "m",
45            "-Xmx" + heapSize + "m",
46            "-XX:G1HeapRegionSize=" + heapRegionSize + "m",
47            "-Xlog:gc",
48            HumongousObjectAllocator.class.getName());
49
50        OutputAnalyzer output = new OutputAnalyzer(pb.start());
51        output.shouldContain("Pause Initial Mark (G1 Humongous Allocation)");
52        output.shouldHaveExitValue(0);
53    }
54
55    static class HumongousObjectAllocator {
56        public static void main(String [] args) {
57            for (int i = 0; i < heapSize; i++) {
58                // 131069 is the number of longs it takes to fill a heapRegion except
59                // for 8 bytes on 64 bit.
60                long[] largeObect = new long[131069];
61            }
62        }
63    }
64}
65
66