| /* |
| * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test TestHumongousAllocInitialMark |
| * @bug 7168848 |
| * @summary G1: humongous object allocations should initiate marking cycles when necessary |
| * @library /testlibrary |
| */ |
| |
| import com.oracle.java.testlibrary.*; |
| |
| public class TestHumongousAllocInitialMark { |
| private static final int heapSize = 200; // MB |
| private static final int heapRegionSize = 1; // MB |
| private static final int initiatingHeapOccupancyPercent = 50; // % |
| |
| public static void main(String[] args) throws Exception { |
| ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( |
| "-XX:+UseG1GC", |
| "-Xms" + heapSize + "m", |
| "-Xmx" + heapSize + "m", |
| "-XX:G1HeapRegionSize=" + heapRegionSize + "m", |
| "-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent, |
| "-XX:+PrintGC", |
| HumongousObjectAllocator.class.getName()); |
| |
| OutputAnalyzer output = new OutputAnalyzer(pb.start()); |
| output.shouldContain("GC pause (G1 Humongous Allocation) (young) (initial-mark)"); |
| output.shouldNotContain("Full GC"); |
| output.shouldHaveExitValue(0); |
| } |
| |
| static class HumongousObjectAllocator { |
| private static byte[] dummy; |
| |
| public static void main(String [] args) throws Exception { |
| // Make object size 75% of region size |
| final int humongousObjectSize = |
| (int)(heapRegionSize * 1024 * 1024 * 0.75); |
| |
| // Number of objects to allocate to go above IHOP |
| final int humongousObjectAllocations = |
| (int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1; |
| |
| // Allocate |
| for (int i = 1; i <= humongousObjectAllocations; i++) { |
| System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations + |
| " of size " + humongousObjectSize + " bytes"); |
| dummy = new byte[humongousObjectSize]; |
| } |
| } |
| } |
| } |
| |