shared archive file

Dictionary Distribution

        The Shared System Dictionary and System Dictionary data obtained after App started and run for a while,  
        the footprint(s)  for SystemDictionary are different --that depends how many classes loaded at that time.
        The SharedDictionary showed more variant bucket(s) size.
        The last row, run with -XX:+PrintSharedArchiveAndExit which exit after classes in shared archive loaded, 
        then print out and exit right away. The max bucket size reduced --- shown improvement in table balance.
        This is single run, does not have statistical significance, but we can see after fix, there is no major 
        concern about the table balance --- if we regard the App as a no-small application.   
    

Extra test for changing bucket size

        The data was obtained by using of -XX:PredictedLoadedClassCount=NUMBER
        By changing the numbers, we can see how the data distribution chnaged.
        Code changes for this test:
        --- a/src/share/vm/classfile/systemDictionary.cpp       Thu Jul 09 15:39:05 2015 -0400

+++ b/src/share/vm/classfile/systemDictionary.cpp       Fri Jul 10 15:22:48 2015 -0700
@@ -1146,9 +1146,10 @@
 #if INCLUDE_CDS
 void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length,
                                              int number_of_entries) {
-  assert(length == _nof_buckets * sizeof(HashtableBucket),
+  int nof_buckets = calculate_systemdictionary_size(PredictedLoadedClassCount);
+  assert(length == nof_buckets * (int)sizeof(HashtableBucket),
          "bad shared dictionary size.");
-  _shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries);
+  _shared_dictionary = new Dictionary(nof_buckets, t, number_of_entries);
 }