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ECRTS
2009
IEEE

Using Randomized Caches in Probabilistic Real-Time Systems

9 years 8 months ago
Using Randomized Caches in Probabilistic Real-Time Systems
While hardware caches are generally effective at improving application performance, they greatly complicate performance prediction. Slight changes in memory layout or data access patterns can lead to large and systematic increases in cache misses, degrading performance. In the worst case, these misses can effectively render the cache useless. These pathological cases, or "cache risk patterns", are difficult to predict, test or debug, and their presence limits the usefulness of caches in safety critical real-time systems, especially in hard real-time environments. In this paper, we explore the effect of randomized cache replacement policies in real-time systems with stringent timing constrains. We present simulation-based results on representative examples that illustrate the problem of performance anomalies with standard cache replacement policies. We show that, by eliminating dependencies on access history, randomized replacement greatly reduces the risk of these cache-based...
Eduardo Quiñones, Emery D. Berger, Guillem
Added 17 Feb 2011
Updated 17 Feb 2011
Type Journal
Year 2009
Where ECRTS
Authors Eduardo Quiñones, Emery D. Berger, Guillem Bernat, Francisco J. Cazorla
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