1 /*
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  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
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  23 
  24 /*
  25  * @test TestRemsetLoggingThreads
  26  * @bug 8025441
  27  * @summary Ensure that various values of worker threads/concurrent
  28  * refinement threads do not crash the VM.
  29  * @key gc
  30  * @library /testlibrary
  31  * @modules java.base/sun.misc
  32  *          java.management/sun.management
  33  */
  34 
  35 import java.util.regex.Matcher;
  36 import java.util.regex.Pattern;
  37 
  38 import jdk.test.lib.ProcessTools;
  39 import jdk.test.lib.OutputAnalyzer;
  40 
  41 public class TestRemsetLoggingThreads {
  42 
  43   private static void runTest(int refinementThreads, int workerThreads) throws Exception {
  44     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
  45                                                               "-XX:+UnlockDiagnosticVMOptions",
  46                                                               "-Xlog:gc+remset+exit=trace",
  47                                                               "-XX:G1ConcRefinementThreads=" + refinementThreads,
  48                                                               "-XX:ParallelGCThreads=" + workerThreads,
  49                                                               "-version");
  50 
  51     OutputAnalyzer output = new OutputAnalyzer(pb.start());
  52 
  53     // a zero in refinement thread numbers indicates that the value in ParallelGCThreads should be used.
  54     // Additionally use at least one thread.
  55     int expectedNumRefinementThreads = refinementThreads;
  56 
  57     String pattern = "Concurrent RS threads times \\(s\\)$";
  58     Matcher m = Pattern.compile(pattern, Pattern.MULTILINE).matcher(output.getStdout());
  59 
  60     if (!m.find()) {
  61       throw new Exception("Could not find correct output for concurrent RS threads times in stdout," +
  62         " should match the pattern \"" + pattern + "\", but stdout is \n" + output.getStdout());
  63     }
  64     output.shouldHaveExitValue(0);
  65   }
  66 
  67   public static void main(String[] args) throws Exception {
  68     if (!TestRemsetLoggingTools.testingG1GC()) {
  69       return;
  70     }
  71     // different valid combinations of number of refinement and gc worker threads
  72     runTest(1, 1);
  73     runTest(1, 5);
  74     runTest(5, 1);
  75     runTest(10, 10);
  76     runTest(1, 2);
  77     runTest(4, 3);
  78   }
  79 }