1 /* 2 * Copyright (c) 2012, 2013, 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 * @requires vm.gc=="G1" | vm.gc=="null" 28 * @summary G1: humongous object allocations should initiate marking cycles when necessary 29 * @library /testlibrary 30 */ 31 32 import com.oracle.java.testlibrary.*; 33 34 public class TestHumongousAllocInitialMark { 35 private static final int heapSize = 200; // MB 36 private static final int heapRegionSize = 1; // MB 37 private static final int initiatingHeapOccupancyPercent = 50; // % 38 39 public static void main(String[] args) throws Exception { 40 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 41 "-XX:+UseG1GC", 42 "-Xms" + heapSize + "m", 43 "-Xmx" + heapSize + "m", 44 "-XX:G1HeapRegionSize=" + heapRegionSize + "m", 45 "-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent, 46 "-XX:+PrintGC", 47 HumongousObjectAllocator.class.getName()); 48 49 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 50 output.shouldContain("GC pause (G1 Humongous Allocation) (young) (initial-mark)"); 51 output.shouldNotContain("Full GC"); 52 output.shouldHaveExitValue(0); 53 } 54 55 static class HumongousObjectAllocator { 56 private static byte[] dummy; 57 58 public static void main(String [] args) throws Exception { 59 // Make object size 75% of region size 60 final int humongousObjectSize = 61 (int)(heapRegionSize * 1024 * 1024 * 0.75); 62 63 // Number of objects to allocate to go above IHOP 64 final int humongousObjectAllocations = 65 (int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1; 66 67 // Allocate 68 for (int i = 1; i <= humongousObjectAllocations; i++) { 69 System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations + 70 " of size " + humongousObjectSize + " bytes"); 71 dummy = new byte[humongousObjectSize]; 72 } 73 } 74 } 75 } 76