TestThreadCountsOverride.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test TestThreadCountsOverride
 * @summary Test that Shenandoah GC thread counts are overridable
 * @requires vm.gc.Shenandoah
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run driver TestThreadCountsOverride
 */

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

public class TestThreadCountsOverride {
    public static void main(String[] args) throws Exception {
        {
            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
                "-Xmx128m",
                "-XX:+UnlockDiagnosticVMOptions",
                "-XX:+UnlockExperimentalVMOptions",
                "-XX:+UseShenandoahGC",
                "-XX:ParallelGCThreads=1",
                "-XX:+PrintFlagsFinal",
                "-version");
            OutputAnalyzer output = new OutputAnalyzer(pb.start());

            output.shouldMatch("ParallelGCThreads(.*)= 1 ");
            output.shouldHaveExitValue(0);
        }

        {
            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
                "-Xmx128m",
                "-XX:+UnlockDiagnosticVMOptions",
                "-XX:+UnlockExperimentalVMOptions",
                "-XX:+UseShenandoahGC",
                "-XX:ConcGCThreads=1",
                "-XX:+PrintFlagsFinal",
                "-version");
            OutputAnalyzer output = new OutputAnalyzer(pb.start());

            output.shouldMatch("ConcGCThreads(.*)= 1 ");
            output.shouldHaveExitValue(0);
        }
    }

}