test/hotspot/jtreg/gc/ergonomics/TestInitialGCThreadLogging.java

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/*
 * @test TestInitialGCThreadLogging
 * @bug 8157240
 * @summary Check trace logging of initial GC threads.
 * @requires vm.gc=="null"
 * @key gc
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @build sun.hotspot.WhiteBox
 * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestInitialGCThreadLogging
 */

import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import sun.hotspot.gc.GC;

public class TestInitialGCThreadLogging {
  public static void main(String[] args) throws Exception {

    testInitialGCThreadLogging("UseConcMarkSweepGC", "GC Thread");

    testInitialGCThreadLogging("UseG1GC", "GC Thread");

    testInitialGCThreadLogging("UseParallelGC", "ParGC Thread");

    if (GC.Shenandoah.isSupported()) {
        testInitialGCThreadLogging("UseShenandoahGC", "Shenandoah GC Thread");
    }
  }

  private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output, String threadName) {
    output.shouldHaveExitValue(0); // test should run succesfully
    output.shouldContain(threadName);
  }

  private static void testInitialGCThreadLogging(String gcFlag, String threadName) throws Exception {
    // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled
    String[] baseArgs = {"-XX:+UnlockExperimentalVMOptions", "-XX:+" + gcFlag, "-Xmx10M", "-XX:+UseDynamicNumberOfGCThreads", "-Xlog:gc+task=trace", "-version"};

    // Base test with gc and +UseDynamicNumberOfGCThreads:
    ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(baseArgs);
    verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()), threadName);
  }
}