Abstract
Recent advances in hardware interconnection techniques for local networks have highlighted the inadequacies in existing software interconnection technology. Though the idea of using a pure message passing operating system to improve this situation is not a new one, in the environment of a mature high speed local network it is an idea whose time has come. A new timesharing system being developed at the Lawrence Livermore Laboratory is a pure message passing system. In this system, all services that are typically obtained directly by a system call (reading and writing files, terminal I/O, creating and controlling other processes, etc.) are instead obtained by communicating via messages with system service processes (which may be local or remote). The motivation for the development of this new system and some design and implementation features needed for its efficient operation are discussed.
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