TestParallelRefprocSanity.java

/*
 * 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.
 *
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 * 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
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 */

/*
 * @test TestParallelRefprocSanity
 * @summary Test that reference processing works with both parallel and non-parallel variants.
 * @key gc
 *
 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g                              TestParallelRefprocSanity
 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g  -XX:-ParallelRefProcEnabled TestParallelRefprocSanity
 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g  -XX:+ParallelRefProcEnabled TestParallelRefprocSanity
 */

import java.lang.ref.*;

public class TestParallelRefprocSanity {

    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 {
        long count = TARGET_MB * 1024 * 1024 / 32;
        for (long c = 0; c < count; c++) {
            sink = new WeakReference<Object>(new Object());
        }
    }

}