1 /* 2 * Copyright (c) 2014, 2015, 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 DisableResizePLAB 26 * @key gc 27 * @bug 8060467 28 * @author filipp.zhinkin@oracle.com, john.coomes@oracle.com 29 * @requires vm.gc=="ConcMarkSweep" | vm.gc=="null" 30 * @summary Run CMS with PLAB resizing disabled and a small OldPLABSize 31 * @run main/othervm -XX:+UseConcMarkSweepGC -XX:-ResizePLAB -XX:OldPLABSize=1k -Xmx256m -XX:+PrintGCDetails DisableResizePLAB 32 */ 33 34 public class DisableResizePLAB { 35 public static void main(String args[]) throws Exception { 36 Object garbage[] = new Object[1_000]; 37 for (int i = 0; i < garbage.length; i++) { 38 garbage[i] = new byte[0]; 39 } 40 long startTime = System.currentTimeMillis(); 41 while (System.currentTimeMillis() - startTime < 10_000) { 42 Object o = new byte[1024]; 43 } 44 } 45 }