1 /*

     2  * Copyright (c) 2012, 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

    21  * questions.

    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  */

    30 

    31 import com.oracle.java.testlibrary.*;

    32 

    33 public class TestHumongousAllocInitialMark {

    34     private static final int heapSize                       = 200; // MB

    35     private static final int heapRegionSize                 = 1;   // MB

    36     private static final int initiatingHeapOccupancyPercent = 50;  // %

    37 

    38     public static void main(String[] args) throws Exception {

    39         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

    40             "-XX:+UseG1GC",

    41             "-Xms" + heapSize + "m",

    42             "-Xmx" + heapSize + "m",

    43             "-XX:G1HeapRegionSize=" + heapRegionSize + "m",

    44             "-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent,

    45             "-XX:+PrintGC",

    46             HumongousObjectAllocator.class.getName());

    47 

    48         OutputAnalyzer output = new OutputAnalyzer(pb.start());

    49         output.shouldContain("GC pause (G1 Humongous Allocation) (young) (initial-mark)");

    50         output.shouldNotContain("Full GC");

    51         output.shouldHaveExitValue(0);

    52     }

    53 

    54     static class HumongousObjectAllocator {

    55         private static byte[] dummy;

    56 

    57         public static void main(String [] args) throws Exception {

    58             // Make object size 75% of region size

    59             final int humongousObjectSize =

    60                 (int)(heapRegionSize * 1024 * 1024 * 0.75);

    61 

    62             // Number of objects to allocate to go above IHOP

    63             final int humongousObjectAllocations =

    64                 (int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1;

    65 

    66             // Allocate

    67             for (int i = 1; i <= humongousObjectAllocations; i++) {

    68                 System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations +

    69                                    " of size " + humongousObjectSize + " bytes");

    70                 dummy = new byte[humongousObjectSize];

    71             }

    72         }

    73     }

    74 }

    75