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 * @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