TestExplicitGCNoConcurrent.java

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/*
 * @test TestExplicitGCNoConcurrent
 * @summary Test that Shenandoah reacts to explicit GC flags appropriately
 * @requires vm.gc.Shenandoah
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run driver TestExplicitGCNoConcurrent
 */

import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;

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",
                "Pause Init Traversal",
                "Pause Final Traversal",
        };

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

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