| /* |
| * Copyright (c) 2016, 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 |
| * @key gc regression |
| * @bug 8169703 |
| * @summary Regression test to ensure AlwaysPreTouch with multiple threads works at mutator time. |
| * Allocates a few humongous objects that will be allocated by expanding the heap, causing concurrent parallel |
| * pre-touch. |
| * @requires vm.gc.G1 |
| * @run main/othervm -XX:+UseG1GC -Xms10M -Xmx100m -XX:G1HeapRegionSize=1M -XX:+AlwaysPreTouch -XX:PreTouchParallelChunkSize=512k -Xlog:gc+ergo+heap=debug,gc+heap=debug,gc=debug TestParallelAlwaysPreTouch |
| */ |
| |
| public class TestParallelAlwaysPreTouch { |
| public static void main(String[] args) throws Exception { |
| final int M = 1024 * 1024; // Something guaranteed to be larger than a region to be counted as humongous. |
| |
| for (int i = 0; i < 10; i++) { |
| Object[] obj = new Object[M]; |
| System.out.println(obj); |
| } |
| } |
| } |
| |
