1 /* 2 * Copyright (c) 2012, 2020, 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 package gc.g1; 25 26 /* 27 * @test TestHumongousAllocConcurrentStart 28 * @bug 7168848 29 * @summary G1: humongous object allocations should initiate marking cycles when necessary 30 * @requires vm.gc.G1 31 * @library /test/lib 32 * @modules java.base/jdk.internal.misc 33 * java.management 34 * @run driver gc.g1.TestHumongousAllocConcurrentStart 35 */ 36 37 import jdk.test.lib.process.OutputAnalyzer; 38 import jdk.test.lib.process.ProcessTools; 39 40 public class TestHumongousAllocConcurrentStart { 41 // Heap sizes < 224 MB are increased to 224 MB if vm_page_size == 64K to 42 // fulfill alignment constraints. 43 private static final int heapSize = 224; // MB 44 private static final int heapRegionSize = 1; // MB 45 private static final int initiatingHeapOccupancyPercent = 50; // % 46 47 public static void main(String[] args) throws Exception { 48 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 49 "-XX:+UseG1GC", 50 "-Xms" + heapSize + "m", 51 "-Xmx" + heapSize + "m", 52 "-XX:G1HeapRegionSize=" + heapRegionSize + "m", 53 "-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent, 54 "-Xlog:gc", 55 HumongousObjectAllocator.class.getName()); 56 57 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 58 output.shouldContain("Pause Young (Concurrent Start) (G1 Humongous Allocation)"); 59 output.shouldNotContain("Full GC"); 60 output.shouldHaveExitValue(0); 61 } 62 63 static class HumongousObjectAllocator { 64 private static byte[] dummy; 65 66 public static void main(String [] args) throws Exception { 67 // Make object size 75% of region size 68 final int humongousObjectSize = 69 (int)(heapRegionSize * 1024 * 1024 * 0.75); 70 71 // Number of objects to allocate to go above IHOP 72 final int humongousObjectAllocations = 73 (int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1; 74 75 // Allocate 76 for (int i = 1; i <= humongousObjectAllocations; i++) { 77 System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations + 78 " of size " + humongousObjectSize + " bytes"); 79 dummy = new byte[humongousObjectSize]; 80 } 81 } 82 } 83 } 84