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