TestExplicitGCNoConcurrent.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.
 *
 * 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 TestExplicitGCNoConcurrent
 * @summary Test that Shenandoah reacts to explicit GC flags appropriately
 * @key gc
 * @library /testlibrary
 *
 * @run driver TestExplicitGCNoConcurrent
 */

import com.oracle.java.testlibrary.*;

public class TestExplicitGCNoConcurrent {

    public static void main(String[] args) throws Exception {
        if (args.length > 0) {
            System.out.println("Calling System.gc()");
            System.gc();
            return;
        }

        String[] concurrent = new String[] {
                "Pause Init Mark",
                "Pause Final Mark",
                "Pause Init Update Refs",
                "Pause Final Update Refs",
        };

        String[] opts = new String[] {
                "",
                "-XX:-ExplicitGCInvokesConcurrent",
                "-XX:+ExplicitGCInvokesConcurrent"
        };

        for (String opt : opts) {
            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
                    "-Xmx128m",
                    "-XX:+UnlockExperimentalVMOptions",
                    "-XX:+UseShenandoahGC",
                    "-verbose:gc",
                    "-XX:+UnlockDiagnosticVMOptions",
                    opt,
                    "-XX:ShenandoahGCHeuristics=passive",
                    TestExplicitGCNoConcurrent.class.getName(),
                    "test");
            OutputAnalyzer output = new OutputAnalyzer(pb.start());
            for (String p : concurrent) {
                output.shouldNotContain(p);
            }
        }
    }
}