Performance Evaluation of the Time Analysable On-Demand Coherent Cache

Abstract

The usage of caches in multi- and many-core systems for timing critical applications is a challenging issue. Time-predictability shaped up as the essential characteristic of a cache when talking about the suitability for hard real-time systems. Common cache coherence mechanisms corrupt the timing analysability of a cache memory because of unpredictable interferences between the caches. Thus, these mechanisms are unsuitable for hard real-time systems. In this work, we briefly describe the ODC2 together with an extension which increases the cache hit rate. We evaluated the performance of the extended ODC2 by comparing it to analysable uncached accesses to shared data and to the well-known but unpredictable MESI and MOESI coherence techniques.