1 /* 2 * Copyright (c) 2012, 2016, 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 * @requires vm.gc.G1 29 * @library /test/lib 30 * @modules java.base/jdk.internal.misc 31 * java.management 32 */ 33 34 import jdk.test.lib.process.OutputAnalyzer; 35 import jdk.test.lib.process.ProcessTools; 36 37 public class TestHumongousAllocInitialMark { 38 // Heap sizes < 224 MB are increased to 224 MB if vm_page_size == 64K to 39 // fulfill alignment constraints. 40 private static final int heapSize = 224; // MB 41 private static final int heapRegionSize = 1; // MB 42 private static final int initiatingHeapOccupancyPercent = 50; // % 43 44 public static void main(String[] args) throws Exception { 45 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 46 "-XX:+UseG1GC", 47 "-Xms" + heapSize + "m", 48 "-Xmx" + heapSize + "m", 49 "-XX:G1HeapRegionSize=" + heapRegionSize + "m", 50 "-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent, 51 "-Xlog:gc", 52 HumongousObjectAllocator.class.getName()); 53 54 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 55 output.shouldContain("Pause Initial Mark (G1 Humongous Allocation)"); 56 output.shouldNotContain("Full GC"); 57 output.shouldHaveExitValue(0); 58 } 59 60 static class HumongousObjectAllocator { 61 private static byte[] dummy; 62 63 public static void main(String [] args) throws Exception { 64 // Make object size 75% of region size 65 final int humongousObjectSize = 66 (int)(heapRegionSize * 1024 * 1024 * 0.75); 67 68 // Number of objects to allocate to go above IHOP 69 final int humongousObjectAllocations = 70 (int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1; 71 72 // Allocate 73 for (int i = 1; i <= humongousObjectAllocations; i++) { 74 System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations + 75 " of size " + humongousObjectSize + " bytes"); 76 dummy = new byte[humongousObjectSize]; 77 } 78 } 79 } 80 } 81