hotspot/test/gc/TestG1ZeroPGCTJcmdThreadPrint.java

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/* @test TestG1ZeroPGCTJcmdThreadPrint
 * @key gc
 * @bug 8005875
 * @summary Use jcmd to generate a thread dump of a Java program being run with PGCT=0 to verify 8005875
 * @library /testlibrary
 * @run main/othervm -XX:+UseG1GC -XX:ParallelGCThreads=0 -XX:+IgnoreUnrecognizedVMOptions TestG1ZeroPGCTJcmdThreadPrint
 */

import com.oracle.java.testlibrary.*;

public class TestG1ZeroPGCTJcmdThreadPrint {
  public static void main(String args[]) throws Exception {

    // Grab the pid from the current java process
    String pid = Integer.toString(ProcessTools.getProcessId());

    // Create a ProcessBuilder
    ProcessBuilder pb = new ProcessBuilder();

    // Run jcmd <pid> Thread.print
    pb.command(JDKToolFinder.getJDKTool("jcmd"), pid, "Thread.print");

    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    // There shouldn't be a work gang for concurrent marking.
    output.shouldNotContain("G1 Parallel Marking Threads");

    // Make sure we didn't crash
    output.shouldHaveExitValue(0);
  }
}