/*

 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.

 *

 * 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 TestHeapUncommit

 * @summary Acceptance tests: collector can withstand allocation

 * @key gc

 * @requires vm.gc.Shenandoah & !vm.graal.enabled

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive

 *      -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive

 *      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive

 *      -XX:+ShenandoahDegeneratedGC

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive

 *      -XX:-ShenandoahDegeneratedGC

 *      TestHeapUncommit

 */

/*

 * @test TestHeapUncommit

 * @summary Acceptance tests: collector can withstand allocation

 * @key gc

 * @requires vm.gc.Shenandoah & !vm.graal.enabled

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive

 *      -XX:+ShenandoahVerify

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC

 *      -XX:-UseTLAB -XX:+ShenandoahVerify

 *      TestHeapUncommit

 */

/*

 * @test TestHeapUncommit

 * @summary Acceptance tests: collector can withstand allocation

 * @key gc

 * @requires vm.gc.Shenandoah & !vm.graal.enabled

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal

 *      -XX:+ShenandoahVerify

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0

 *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal -XX:ShenandoahGCHeuristics=aggressive

 *      TestHeapUncommit

 */

/*

 * @test TestHeapUncommit

 * @key gc

 * @requires vm.gc.Shenandoah & !vm.graal.enabled & (vm.bits == "64")

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0 -XX:+UseLargePages

 *      -XX:+UseShenandoahGC

 *      -XX:+ShenandoahVerify

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0 -XX:+UseLargePages

 *      -XX:+UseShenandoahGC

 *      TestHeapUncommit

 *

 * @run main/othervm -Xmx1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay=0 -XX:+UseLargePages

 *      -XX:+UseShenandoahGC

 *      -XX:-UseTLAB -XX:+ShenandoahVerify

 *      TestHeapUncommit

 */

import java.util.Random;

public class TestHeapUncommit {

    static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation

    static volatile Object sink;

    public static void main(String[] args) throws Exception {

        final int min = 0;

        final int max = 384 * 1024;

        long count = TARGET_MB * 1024 * 1024 / (16 + 4 * (min + (max - min) / 2));

        Random r = new Random();

        for (long c = 0; c < count; c++) {

            sink = new int[min + r.nextInt(max - min)];

        }

    }

}