Simplifying Active Memory Clusters by Leveraging Directory Protocol Threads

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Provided by: Indian Institute of Technology Kanpur
Topic: Storage
Format: PDF
Address re-mapping techniques in so-called active memory systems have been shown to dramatically increase the performance of applications with poor cache and/or communication behavior on shared memory multiprocessors. However, these systems require custom hardware in the memory controller for cache line assembly/disassembly, address translation between re-mapped and normal addresses, and coherence logic. In this paper, the authors make the important observation that on a traditional flexible Distributed Shared Memory (DSM) multiprocessor node, equipped with a coherence protocol thread context as in SMTp or a simple dedicated in-order protocol processing core as in a CMP, the address re-mapping techniques can be implemented in software running on the protocol thread or core without custom hardware in the memory controller while delivering high performance.
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