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  1. JDK
  2. JDK-4777652

Performance problem with valuetypes in JDK 1.4.1 ORB

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    • Subcomponent:
    • Resolved In Build:
      b58
    • CPU:
      generic
    • OS:
      generic, solaris_8
    • Verification:
      Not verified

      Backports

        Description

        Description:
        ------------
        The valuetype encoding in iiop (what is used to marshal Serializables in
        iiop) allows implementations to marshal an indirection if it has seen a
        structure before. An indirection is basically an offset into the already
        marshaled message. Its transparent to the end user.

        The problem is that the Sun ValueHandler is not indirecting the repository
        ids of valuetypes when it could. In particular given the following data
        structure:

             Hashtable h = new Hashtable();
             for (int hi=0; hi<100; hi++) {
               h.put(new String("" + hi), new Integer(hi));
             }

        when marshaled on the wire we see repository ids for every String and
        Integer instance. Our own implementation indirects every instance apart
        from the first. Its in our iiop marshaling code. To be clear its the
        repository ids of the types not the instances themselves that can be
        indirected. Not only does this cut down on the size of messages quite
        considerably but unmarshaling an indirection is considerably less
        expensive than unmarshaling a string.

        Reproducibility:
        ---------------
        You can only determine this behavior by looking at a dump of the bytes
        going across the wire.

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                Assignee:
                hcarr Harold Carr
                Reporter:
                cprasadsunw Ck Prasad (Inactive)
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