1 /* 2 * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 /* 25 * @test TestLargeObjectAlignment 26 * @summary Shenandoah crashes with -XX:ObjectAlignmentInBytes=16 27 * @key gc 28 * @requires vm.gc.Shenandoah 29 * 30 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -Xint TestLargeObjectAlignment 31 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:-TieredCompilation TestLargeObjectAlignment 32 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:TieredStopAtLevel=1 TestLargeObjectAlignment 33 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:TieredStopAtLevel=4 TestLargeObjectAlignment 34 */ 35 36 import java.util.ArrayList; 37 import java.util.List; 38 import java.util.concurrent.ThreadLocalRandom; 39 40 public class TestLargeObjectAlignment { 41 42 static final int SLABS_COUNT = Integer.getInteger("slabs", 10000); 43 static final int NODE_COUNT = Integer.getInteger("nodes", 10000); 44 static final long TIME_NS = 1000L * 1000L * Integer.getInteger("timeMs", 5000); 45 46 static Object[] objects; 47 48 public static void main(String[] args) throws Exception { 49 objects = new Object[SLABS_COUNT]; 50 51 long start = System.nanoTime(); 52 while (System.nanoTime() - start < TIME_NS) { 53 objects[ThreadLocalRandom.current().nextInt(SLABS_COUNT)] = createSome(); 54 } 55 } 56 57 public static Object createSome() { 58 List<Integer> result = new ArrayList<Integer>(); 59 for (int c = 0; c < NODE_COUNT; c++) { 60 result.add(new Integer(c)); 61 } 62 return result; 63 } 64 65 }