TestGCThreadGroups.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
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test TestGCThreadGroups
 * @summary Test Shenandoah GC uses concurrent/parallel threads correctly
 * @requires vm.gc.Shenandoah
 *
 * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
 *      -XX:ConcGCThreads=2 -XX:ParallelGCThreads=4
 *      -Dtarget=1000
 *      TestGCThreadGroups
 */

/**
 * @test TestGCThreadGroups
 * @summary Test Shenandoah GC uses concurrent/parallel threads correctly
 * @requires vm.gc.Shenandoah
 *
 * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 *      -XX:+UseShenandoahGC
 *      -XX:ConcGCThreads=2 -XX:ParallelGCThreads=4
 *      -Dtarget=1000
 *      TestGCThreadGroups
 *
 * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 *      -XX:+UseShenandoahGC
 *      -XX:-UseDynamicNumberOfGCThreads
 *      -Dtarget=1000
 *      TestGCThreadGroups
 *
 * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
 *      -XX:ConcGCThreads=2 -XX:ParallelGCThreads=4
 *      -Dtarget=1000
 *      TestGCThreadGroups
 *
 * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static
 *      -XX:ConcGCThreads=2 -XX:ParallelGCThreads=4
 *      -Dtarget=1000
 *      TestGCThreadGroups
 *
 * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
 *      -XX:ConcGCThreads=2 -XX:ParallelGCThreads=4
 *      -Dtarget=100
 *      TestGCThreadGroups
 *
 * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
 *      -XX:ConcGCThreads=2 -XX:ParallelGCThreads=4
 *      -Dtarget=100
 *      TestGCThreadGroups
 */

/**
 * @test TestGCThreadGroups
 * @summary Test Shenandoah GC uses concurrent/parallel threads correctly
 * @requires vm.gc.Shenandoah
 *
 * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
 *      -XX:ConcGCThreads=2 -XX:ParallelGCThreads=4
 *      -Dtarget=1000
 *      TestGCThreadGroups
 *
 * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
 *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
 *      -XX:ConcGCThreads=2 -XX:ParallelGCThreads=4
 *      -Dtarget=1000
 *      TestGCThreadGroups
*/

public class TestGCThreadGroups {

    static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation, around 1K cycles to handle
    static final long STRIDE = 100_000;

    static volatile Object sink;

    public static void main(String[] args) throws Exception {
        long count = TARGET_MB * 1024 * 1024 / 16;
        for (long c = 0; c < count; c += STRIDE) {
            for (long s = 0; s < STRIDE; s++) {
                sink = new Object();
            }
            Thread.sleep(1);
        }
    }

}