Abstract
Monitoring tools to observe the behavior of multi-task programs running on multi-processor architectures are important to help debugging complex real-time applications. To design such a tool, two issues are to be solved, relevant information gathering without disturbing the application behavior, display of this information in a way easily interpreted by designers. This paper presents a new solution for these two above issues. First, it describes a method and a tool to collect an event trace which can be implemented by software only or in an hybrid (software and hardware) way. Information to be collected are automatically selected from the tool and the overhead monitoring time is kept very low. Then, it describes the display tool which clearly shows to the designer the inter-function dependencies, all task states and execution times of real-time kernel primitives. This tool may also be used by designers to observe the value of relevant internal variables of the system. Our solution is target independent: it can be implemented on multi-transputer systems or on any conventional or heterogeneous microprocessor architectures.
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