46   private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output) {
  47     output.shouldHaveExitValue(0); // test should run succesfully
  48     output.shouldContain("new_active_workers");
  49   }
  50 
  51   private static void testDynamicNumberOfGCThreads(String gcFlag) throws Exception {
  52     // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled
  53     String[] baseArgs = {"-XX:+" + gcFlag, "-Xmx10M", "-XX:+UseDynamicNumberOfGCThreads", "-Xlog:gc+task=trace", GCTest.class.getName()};
  54 
  55     // Base test with gc and +UseDynamicNumberOfGCThreads:
  56     ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(baseArgs);
  57     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  58 
  59     // Ensure it also works on uniprocessors or if user specifies -XX:ParallelGCThreads=1:
  60     String[] extraArgs = {"-XX:+UnlockDiagnosticVMOptions", "-XX:+ForceDynamicNumberOfGCThreads", "-XX:ParallelGCThreads=1"};
  61     String[] finalArgs = new String[baseArgs.length + extraArgs.length];
  62     System.arraycopy(extraArgs, 0, finalArgs, 0,                extraArgs.length);
  63     System.arraycopy(baseArgs,  0, finalArgs, extraArgs.length, baseArgs.length);
  64     pb_enabled = ProcessTools.createJavaProcessBuilder(finalArgs);
  65     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));








  66   }
  67 
  68   static class GCTest {
  69     private static byte[] garbage;
  70     public static void main(String [] args) {
  71       System.out.println("Creating garbage");
  72       // create 128MB of garbage. This should result in at least one GC
  73       for (int i = 0; i < 1024; i++) {
  74         garbage = new byte[128 * 1024];
  75       }
  76       System.out.println("Done");
  77     }
  78   }
  79 }

  46   private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output) {
  47     output.shouldHaveExitValue(0); // test should run succesfully
  48     output.shouldContain("new_active_workers");
  49   }
  50 
  51   private static void testDynamicNumberOfGCThreads(String gcFlag) throws Exception {
  52     // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled
  53     String[] baseArgs = {"-XX:+" + gcFlag, "-Xmx10M", "-XX:+UseDynamicNumberOfGCThreads", "-Xlog:gc+task=trace", GCTest.class.getName()};
  54 
  55     // Base test with gc and +UseDynamicNumberOfGCThreads:
  56     ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(baseArgs);
  57     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  58 
  59     // Ensure it also works on uniprocessors or if user specifies -XX:ParallelGCThreads=1:
  60     String[] extraArgs = {"-XX:+UnlockDiagnosticVMOptions", "-XX:+ForceDynamicNumberOfGCThreads", "-XX:ParallelGCThreads=1"};
  61     String[] finalArgs = new String[baseArgs.length + extraArgs.length];
  62     System.arraycopy(extraArgs, 0, finalArgs, 0,                extraArgs.length);
  63     System.arraycopy(baseArgs,  0, finalArgs, extraArgs.length, baseArgs.length);
  64     pb_enabled = ProcessTools.createJavaProcessBuilder(finalArgs);
  65     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  66 
  67     // Turn on parallel reference processing
  68     String[] parRefProcArg = {"-XX:+ParallelRefProcEnabled", "-XX:-ShowMessageBoxOnError"};
  69     String[] parRefArgs = new String[baseArgs.length + parRefProcArg.length];
  70     System.arraycopy(parRefProcArg, 0, parRefArgs, 0,                parRefProcArg.length);
  71     System.arraycopy(baseArgs,  0, parRefArgs, parRefProcArg.length, baseArgs.length);
  72     pb_enabled = ProcessTools.createJavaProcessBuilder(parRefArgs);
  73     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  74   }
  75 
  76   static class GCTest {
  77     private static byte[] garbage;
  78     public static void main(String [] args) {
  79       System.out.println("Creating garbage");
  80       // create 128MB of garbage. This should result in at least one GC
  81       for (int i = 0; i < 1024; i++) {
  82         garbage = new byte[128 * 1024];
  83       }
  84       System.out.println("Done");
  85     }
  86   }
  87 }