TestInitialGCThreadLogging.java

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package gc.ergonomics;

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

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

public class TestInitialGCThreadLogging {
  public static void main(String[] args) throws Exception {
    boolean noneGCSupported = true;

    if (GC.G1.isSupported()) {
      noneGCSupported = false;
      testInitialGCThreadLogging("UseG1GC", "GC Thread");
    }

    if (GC.Parallel.isSupported()) {
      noneGCSupported = false;
      testInitialGCThreadLogging("UseParallelGC", "GC Thread");
    }

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

    if (noneGCSupported) {
      throw new SkippedException("Skipping test because none of G1/Parallel/Shenandoah is supported.");
    }
  }

  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 {
    // Base test with gc and +UseDynamicNumberOfGCThreads:
    ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(
        "-XX:+UnlockExperimentalVMOptions",
        "-XX:+" + gcFlag,
        "-Xmx10M",
        "-XX:+UseDynamicNumberOfGCThreads",
        "-Xlog:gc+task=trace",
        "-version");
    verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()), threadName);
  }
}