30  *          collection time increase.
  31  * @modules java.base/jdk.internal.misc
  32  * @library /test/lib
  33  * @library ../share
  34  * @requires vm.opt.ExplicitGCInvokesConcurrent != true
  35  * @run main/othervm -XX:+UsePerfData -Xmx128M GcCauseTest01
  36  */
  37 import utils.*;
  38 
  39 public class GcCauseTest01 {
  40 
  41     public static void main(String[] args) throws Exception {
  42 
  43         // We will be running "jstat -gc" tool
  44         JstatGcCauseTool jstatGcTool = new JstatGcCauseTool(ProcessHandle.current().getPid());
  45 
  46         // Run once and get the  results asserting that they are reasonable
  47         JstatGcCauseResults measurement1 = jstatGcTool.measure();
  48         measurement1.assertConsistency();
  49 
  50         GcProvoker gcProvoker = GcProvoker.createGcProvoker();
  51 
  52         // Provoke GC then run the tool again and get the results  asserting that they are reasonable
  53         gcProvoker.provokeGc();
  54         JstatGcCauseResults measurement2 = jstatGcTool.measure();
  55         measurement2.assertConsistency();
  56 
  57         // Assert the increase in GC events and time between the measurements
  58         JstatResults.assertGCEventsIncreased(measurement1, measurement2);
  59         JstatResults.assertGCTimeIncreased(measurement1, measurement2);
  60 
  61         // Provoke GC 3rd time then run the tool 3rd time twice and get the results
  62         // asserting that they are reasonable
  63         gcProvoker.provokeGc();
  64         JstatGcCauseResults measurement3 = jstatGcTool.measure();
  65         measurement3.assertConsistency();
  66 
  67         // Assert the increase in GC events and time between the measurements
  68         JstatResults.assertGCEventsIncreased(measurement2, measurement3);
  69         JstatResults.assertGCTimeIncreased(measurement2, measurement3);
  70     }

  30  *          collection time increase.
  31  * @modules java.base/jdk.internal.misc
  32  * @library /test/lib
  33  * @library ../share
  34  * @requires vm.opt.ExplicitGCInvokesConcurrent != true
  35  * @run main/othervm -XX:+UsePerfData -Xmx128M GcCauseTest01
  36  */
  37 import utils.*;
  38 
  39 public class GcCauseTest01 {
  40 
  41     public static void main(String[] args) throws Exception {
  42 
  43         // We will be running "jstat -gc" tool
  44         JstatGcCauseTool jstatGcTool = new JstatGcCauseTool(ProcessHandle.current().getPid());
  45 
  46         // Run once and get the  results asserting that they are reasonable
  47         JstatGcCauseResults measurement1 = jstatGcTool.measure();
  48         measurement1.assertConsistency();
  49 
  50         GcProvoker gcProvoker = new GcProvoker();
  51 
  52         // Provoke GC then run the tool again and get the results  asserting that they are reasonable
  53         gcProvoker.provokeGc();
  54         JstatGcCauseResults measurement2 = jstatGcTool.measure();
  55         measurement2.assertConsistency();
  56 
  57         // Assert the increase in GC events and time between the measurements
  58         JstatResults.assertGCEventsIncreased(measurement1, measurement2);
  59         JstatResults.assertGCTimeIncreased(measurement1, measurement2);
  60 
  61         // Provoke GC 3rd time then run the tool 3rd time twice and get the results
  62         // asserting that they are reasonable
  63         gcProvoker.provokeGc();
  64         JstatGcCauseResults measurement3 = jstatGcTool.measure();
  65         measurement3.assertConsistency();
  66 
  67         // Assert the increase in GC events and time between the measurements
  68         JstatResults.assertGCEventsIncreased(measurement2, measurement3);
  69         JstatResults.assertGCTimeIncreased(measurement2, measurement3);
  70     }