1 /* 2 * Copyright (c) 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 TestObjectAlignment 26 * @key gc 27 * @bug 8021823 28 * @summary G1: Concurrent marking crashes with -XX:ObjectAlignmentInBytes>=32 in 64bit VMs 29 * @library /testlibrary 30 * @run main/othervm TestObjectAlignment 31 */ 32 33 import com.oracle.java.testlibrary.ProcessTools; 34 import com.oracle.java.testlibrary.OutputAnalyzer; 35 36 public class TestObjectAlignment { 37 38 private static boolean runsOn32bit() { 39 return System.getProperty("sun.arch.data.model").equals("32"); 40 } 41 42 public static void runTest(int objectAlignment) throws Exception { 43 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC", 44 "-Xmx20M", 45 "-XX:+ExplicitGCInvokesConcurrent", 46 "-XX:ObjectAlignmentInBytes=" + objectAlignment, 47 TestObjectAlignmentTest.class.getName()); 48 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 49 output.shouldHaveExitValue(0); 50 } 51 52 public static void main(String[] args) throws Exception { 53 if (runsOn32bit()) { 54 // 32 bit VMs do not allow setting ObjectAlignmentInBytes. 55 return; 56 } 57 runTest(8); 58 runTest(16); 59 runTest(32); 60 runTest(64); 61 runTest(128); 62 runTest(256); 63 } 64 65 static class TestObjectAlignmentTest { 66 static byte[] garbage; 67 68 public static void main(String [] args) { 69 for (int i = 0; i < 100; i++) { 70 garbage = new byte[1000]; 71 System.gc(); 72 } 73 } 74 } 75 }