--- old/test/hotspot/jtreg/runtime/appcds/sharedStrings/ExerciseGC.java	2018-07-25 19:02:05.165765344 -0700
+++ new/test/hotspot/jtreg/runtime/appcds/sharedStrings/ExerciseGC.java	2018-07-25 19:02:05.053765341 -0700
@@ -33,6 +33,8 @@
  * @build HelloStringGC sun.hotspot.WhiteBox
  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  * @run main ExerciseGC
+ * @run main/othervm -XX:+UseStringDeduplication ExerciseGC
+ * @run main/othervm -XX:-CompactStrings ExerciseGC
  */
 public class ExerciseGC {
     public static void main(String[] args) throws Exception {