TestStringDeduplicationMemoryUsage test failing

execStatus=Failed. Execution failed\: `main' threw exception\: java.lang.Exception\: Unexpected memory usage, heapMemoryUsageWithDedup should be less or equal to heapMemoryUsageWithDedupExpected

Memory usage summary:
   heapMemoryUsageWithoutDedup: 1767168
   heapMemoryUsageWithDedup: 671352
   heapMemoryUsageWithDedupExpected: 647280
----------System.err:(16/1112)----------


java.lang.Exception: Unexpected memory usage, heapMemoryUsageWithDedup should be less or equal to heapMemoryUsageWithDedupExpected
at TestStringDeduplicationTools.testMemoryUsage(TestStringDeduplicationTools.java:520)
at TestStringDeduplicationMemoryUsage.main(TestStringDeduplicationMemoryUsage.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:484)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:745)