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Séminaire d'équipe(s) Parallel Systems
Lazy Spilling for a Time-Predictable Stack Cache: Implementation and Analysis
Florian Brandner

14 October 2014, 10:30 - 14 October 2014, 11:00
Salle/Bat : 465/PCRI-N
Contact :

Activités de recherche : High-performance computing

Résumé :
The growing complexity of modern computer architectures increasingly complicates the prediction of the run-time behavior of software. For real-time systems, where a safe estimation of the program’s worst-case execution time is needed, time-predictable computer architectures promise to resolve this
problem. A stack cache, for instance, allows the compiler to efficiently cache a program’s stack, while static analysis of its behavior remains easy. Likewise, its implementation requires little hardware overhead.

This work introduces an optimization of the standard stack cache to avoid redundant spilling of the cache content to main memory, if the content was not modified in the meantime. At first sight, this appears to be an average-case optimization. Indeed, measurements show that the number of cache blocks
spilled is reduced to about 17% and 30% in the mean, depending on the stack cache size. Furthermore, we show that lazy spilling can be analyzed with little extra effort, which benefits the worst-case spilling behavior that is relevant for a real-time system.

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