| Publisher | IONA Technologies | ||
|---|---|---|---|
| Format | 55.5KB PDF, requires Acrobat Rdr 5 | Date added | 09 Oct 1999 |
| Topics | Communications Software, Object-Oriented, Programming Languages | ||
| Downloads | 108 | ||
Unlike COM, which evolved from its original collocated component model into a networked component model, CORBA is often considered to be a distributed object computing model. However, there are situations where clients and servants must be configured in the same address space. For example, user-supplied ServantManagers are ordinary CORBA objects that are invoked by POAs to help incarnate servants. In such cases, CORBA ORBs can transparently employ collocation optimizations to ensure there’s no unnecessary overhead of (de)marshaling data or transmitting requests/replies through a "loopback" communication device. In this column, we describe and evaluate several collocation techniques. To make the discussion concrete, we describe how collocation is supported in TAO, which is an ORB developed at Washington University, St. Louis. Finally, we present benchmarking results that compare the relative performance gains from various types of collocation strategies and optimizations.
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