1. Distributed Computing Environment (DCE) Mark Daniel Gibbons

2. Proposition  Open Software Foundation (OSF)  Consortium  Open Unix environment  No influence AT&T and Sun [closed]

3. Services  DCE  Threads  RPC  Security  Directory services  Unix & Non-Unix  Sits on top of OS  Hierarchical Structure  Kernel, Transport Service  Processes  Threads

4. Architecture

5. Primary Objects  Distributed file service  Others built upon  Concurrency control  Group management  Security & management  All layers

6. DCE RPC  TCP  UDP  Cell – group as a unit  Client & server  Cell servers communication

7. Latest relevant knowledge  Papers dated in the 90s (max 1997 found)  Measuring RPC traffic  Performance of RCP  Integrating RCP and COBRA  Distributed shared memory  Services using DCE  Ideas of DCE used  DCE Today – Latest book (1998)

8. Future works  My prediction  Prevalence of DCE will diminish  A better model will emerge  Web services  Some basic foundations by stay  RPC  Basic services → Time, name  Kernel & transport services

9. References Chow, Randy, and Theodore Johnson. Distributed Operating Systems & Algorithms. Reading, MA: Addison Wesley, 1997 Sun, Ying, Rick Bunt, and Greg Oster. "Measuring RPC Traffic in an OS/2 DCE Environment." Proceedings Fifth International Symposium on MASCOTS (1997): 51-54. Print. "DCE -- OpenDCE -- Portal." Front Page | The Open Group. Web. 11 Sept. 2011..