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23 
24 package gc.g1;
25 
26 /*
27  * @test TestRemsetLoggingThreads
28  * @requires vm.gc.G1
29  * @bug 8025441 8145534
30  * @key gc
31  * @library /test/lib
32  * @modules java.base/jdk.internal.misc
33  *          java.management/sun.management
34  * @summary Ensure that various values of worker threads/concurrent
35  * refinement threads do not crash the VM.
36  * @run main gc.g1.TestRemsetLoggingThreads
37  */
38 
39 import java.util.regex.Matcher;
40 import java.util.regex.Pattern;
41 
42 import jdk.test.lib.process.OutputAnalyzer;
43 import jdk.test.lib.process.ProcessTools;
44 
45 public class TestRemsetLoggingThreads {
46 
runTest(int refinementThreads, int workerThreads)47   private static void runTest(int refinementThreads, int workerThreads) throws Exception {
48     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
49                                                               "-XX:+UnlockDiagnosticVMOptions",
50                                                               "-Xlog:gc+remset+exit=trace",
51                                                               "-XX:G1ConcRefinementThreads=" + refinementThreads,
52                                                               "-XX:ParallelGCThreads=" + workerThreads,
53                                                               "-version");
54 
55     OutputAnalyzer output = new OutputAnalyzer(pb.start());
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 
main(String[] args)67   public static void main(String[] args) throws Exception {
68     // different valid combinations of number of refinement and gc worker threads
69     runTest(1, 1);
70     runTest(1, 5);
71     runTest(5, 1);
72     runTest(10, 10);
73     runTest(1, 2);
74     runTest(4, 3);
75   }
76 }
77