test/hotspot/jtreg/vmTestbase/nsk/jvmti/unit/heap/HeapWalkTests.java

rev 58143 : imported patch test_heap_walk

@@ -29,10 +29,11 @@
 
 package nsk.jvmti.unit.heap;
 
 import nsk.share.jvmti.unit.*;
 import java.io.PrintStream;
+import java.util.*;
 
 public class HeapWalkTests {
 
     final static int JCK_STATUS_BASE = 95;
     final static int PASSED = 0;

@@ -44,13 +45,16 @@
         // produce JCK-like exit status.
         System.exit(run(args, System.out) + JCK_STATUS_BASE);
     }
 
     public static int run(String args[], PrintStream out) {
-        test1();
+/*        test1();
         test2();
         test3();
+
+ */
+        test4();
         return PASSED;
     }
 
     private static void test1() {
         long tag;

@@ -154,6 +158,29 @@
 
         if (failures > 0) {
             throw new RuntimeException("IterateOverObjectsReachableFromObject test failed");
         }
     }
+
+    static final long TARGET_OBJECTS = 300_000;
+
+    private static void test4() {
+        ArrayList<ArrayList<Foo>> objects = new ArrayList<>();
+        long cnt = 0;
+        Random r = new Random();
+        while (cnt < TARGET_OBJECTS) {
+            int current = r.nextInt(2_000);
+            ArrayList<Foo> list = new ArrayList<>(current);
+            for (int index = 0; index < current; index ++) {
+                list.add(new Foo());
+            }
+            objects.add(list);
+            cnt += current;
+        }
+
+        long start = System.nanoTime();
+        Heap.iterateOverObjectsReachableFromObject(objects);
+        long end = System.nanoTime();
+
+        System.out.println("\nTime: " + (end - start) + " nsecs");
+    }
 }