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2007
IEEE

Toward the Predictable Integration of Real-Time COTS Based Systems

10 years 4 months ago
Toward the Predictable Integration of Real-Time COTS Based Systems
The integration phase of real-time COTS-based systems is often problematic because when multiple tasks run concurrently, the interference at the bus level between cache fetching activities and I/O peripheral transactions is significant and causes unpredictable behaviors: experimentally, tasks can have computation time variance up to 50%. In this work, we present a theoretical framework able to model the interaction between CPU and peripherals contending for shared main memory through the Front Side Bus (FSB). We first show how to compute worst case execution times for a task given a trace of its cache activity and given an upper bound function that models peripheral activities; then, we introduce the novel idea of “hardware server” as a means of controlling the unpredictable behavior of COTS peripheral components.
Rodolfo Pellizzoni, Marco Caccamo
Added 04 Jun 2010
Updated 04 Jun 2010
Type Conference
Year 2007
Where RTSS
Authors Rodolfo Pellizzoni, Marco Caccamo
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