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Heterogeneous prioritization for network-on-chip based multi-core systems




Pimpalkhute, Tejasi, author
Pasricha, Sudeep, advisor
Bohm, Wim, committee member
Jayasumana, Anura, committee member

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In chip multi-processor (CMP) systems, communication and memory access both play an important role in influencing the performance achievable by the system. The manner in which the network packets (on-chip cache requests/responses) and off-chip memory bound packets are handled, in multi-core environment with several applications executing in parallel, determines end-to-end latencies across the network and memory. Several techniques have been proposed in the past that schedule packets in either an application-aware manner or memory requests in a DRAM row/bank locality-aware manner. Prioritization of memory requests is a major factor in increasing the overall system throughput. Moreover, with the increasing diversity in CMP systems, applying the same prioritization rules to all packets traversing the NoC as is done in the current implementations may no longer be a viable approach. In this thesis, a holistic framework is proposed that integrates novel prioritization techniques for both network and memory accesses and operates cohesively in an application-aware and memory-aware manner to optimize overall system performance. The application-aware technique makes fine grain classification of applications with a newly proposed ranking scheme. Two novel memory-prioritization algorithms are also proposed, one of which is specifically tuned for high-speed memories. Upon analyzing the fairness issues that arise in a multi-core environment, a novel strategy is proposed and employed system-wide to ensure fairness in the system. The proposed heterogeneous prioritization framework is validated using a detailed cycle-accurate full system event-driven simulator and shows significant improvement over Round Robin and other recently proposed network and memory prioritization techniques.


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multi-core systems
off-chip memory


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