This paper describes the design and implementation of an Ada system for heterogeneous distributed embedded targets. It permits a single Ada program to run in a loosely coupled, heterogeneous multi-processor environment, enabling the development of a distributed system with Ada's full checking facilities, The units of distribution are task objects, and we examine the impact of this decision on program design. The prototype consists of an Ada-to-C translator and run time routines (RTR) for distributed tasking support. The translator works on IJNIX 1 workstations, and its target program runs on VxWorks2. RTR uses socket facilities for inter-and intra-processor communication to implement Ada tasking. This paper also describes the task monitoring facility which monitors and visualizes interactions among tasks.
This paperevaluates the influence of communication characteristics on server processing load. In Jirture ubiquitous communication environments, terminal-initiated communications will become more popularized than human-initiated communications like current internet communications. The tiny terminal having a short-range wireless communication method like a sensor node is expected to report the presence data involved in a daily life to the server. However, if these terminals become popularized, the sewer must process a lot of presence data compared with current internet communications. Therefore, @om the viewpoint of network scalability, we performed hardware simulations to evaluate the influence of communication characteristics on server processing load and clarijied its critical factor.
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