Efficient shared cache management in multicore processors
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In modern multicore processors, various resources (such as memory bandwidth and caches) are designed to be shared by concurrently running threads. Though it is good to be able to run multiple programs on a single chip at the same time, sometimes the contention of these shared resources can create problems for system performance. Naive hard-partitioning between threads can result in low resource utilization. This research shows that simple and effective approaches to dynamically manage the shared cache can be achieved. The contributions of this work are the following: (1) a technique for dynamic on-line classification of application memory access behaviors to predict the usefulness of cache partitioning, and a simple shared-cache management approach based on the classification; (2) a cache pseudo-partitioning technique that manipulates insertion and promotion policies; (3) a scalable algorithm to quickly decide per-core cache allocations; (4) pseudo-LRU cache partition approximation; (5) a dynamic shared cache compression technique that considers different thread behaviors.