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The provision of a system-wide global time base with a good precision and suficient accuracy is a fundamental prerequisite for the design of a multicluster distributed real-time system. In this paper we investigate the issues of clock synchronization in a multicluster system, where every node can have a different oscillator. Based on the parameter of a typical automotive distributed system we show that a precision and accuracy in the psecond range is achievable without undue effort.

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In modern programming environments for real-time software the presence of task timing analysis tools has become state of the art. Upon the results produced by these tools programmers judge whether software being developed meets the specified timing requirements. In this paper we present a new task taming analysis tool for MARS. This tool not only allows to compute worst case execution time bounds of high quality. It also produces detailed information about the extent to which every statement contributes to this bound and allows to experiment with hypothetical times. These properties of the timing analysis tool allow t o make execution time information an integral part of the entire programming process.