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

rev 58143 : imported patch test_heap_walk

*** 29,38 ****
--- 29,39 ----
  
  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;
*** 44,56 ****
          // produce JCK-like exit status.
          System.exit(run(args, System.out) + JCK_STATUS_BASE);
      }
  
      public static int run(String args[], PrintStream out) {
!         test1();
          test2();
          test3();
          return PASSED;
      }
  
      private static void test1() {
          long tag;
--- 45,60 ----
          // produce JCK-like exit status.
          System.exit(run(args, System.out) + JCK_STATUS_BASE);
      }
  
      public static int run(String args[], PrintStream out) {
! /*        test1();
          test2();
          test3();
+ 
+  */
+         test4();
          return PASSED;
      }
  
      private static void test1() {
          long tag;
*** 154,159 ****
--- 158,186 ----
  
          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");
+     }
  }