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test/hotspot/jtreg/serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorStatRateTest.java

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rev 49644 : [mq]: event_rebased
rev 49645 : [mq]: heap9
rev 49649 : [mq]: heap14

@@ -33,16 +33,11 @@
 
 public class HeapMonitorStatRateTest {
 
   private native static double getAverageRate();
 
-  public static void main(String[] args) {
-    int[] tab = {1024, 16384, 524288};
-
-    for (int rateIdx = 0; rateIdx < tab.length; rateIdx++) {
-      int rate = tab[rateIdx];
-
+  private static boolean testRateOnce(int rate, boolean throwIfFailure) {
       HeapMonitor.resetEventStorage();
       HeapMonitor.setSamplingRate(rate);
 
       HeapMonitor.enableSamplingEvents();
 

@@ -55,12 +50,32 @@
       double expectedCount = allocationTotal / rate;
 
       double error = Math.abs(actualCount - expectedCount);
       double errorPercentage = error / expectedCount * 100;
 
-      if (errorPercentage > 10) {
+    boolean failure = (errorPercentage > 10.0);
+
+    if (failure && throwIfFailure) {
         throw new RuntimeException("Rate average over 10% for rate " + rate + " -> " + actualCount
             + ", " + expectedCount);
       }
+
+    return failure;
+  }
+
+
+  private static void testRate(int rate) {
+    // Test the rate twice, it can happen that the test is "unlucky" and the rate just goes above
+    // the 10% mark. So try again to squash flakiness.
+    if (!testRateOnce(rate, false)) {
+      testRateOnce(rate, true);
+    }
+  }
+
+  public static void main(String[] args) {
+    int[] tab = {1024, 16384, 524288};
+
+    for (int rateIdx = 0; rateIdx < tab.length; rateIdx++) {
+      testRate(tab[rateIdx]);
     }
   }
 }
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