/*

 * 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

 * @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

 * @key gc

 * @key regression

 * @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);

        }

    }

}