Title:
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P-slice based efficient speculative multithreading
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Author:
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Ranjan, Rakesh; Marcuello Pascual, Pedro; Latorre Salinas, Fernando; González Colás, Antonio María
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Arquitectura de Computadors; Universitat Politècnica de Catalunya. ARCO - Microarquitectura i Compiladors |
Abstract:
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Microprocessor industry has recently shifted
towards multi-core to take advantage of the ever increasing number of transistors provided by the new technologies. Unfortunately, the multi-core approach does not allow single threaded applications to benefit from the additional cores to improve their execution time. Speculative multithreading (SpMT) has been proposed in the past to boost performance of irregular applications in multi-core environments. In this work, we study the main bottlenecks of these architectures, such as the memory behavior and the pre-computation slices
and propose two novel schemes that allow SpMT to get 25% average speedup over single threaded execution. We propose Selective Replication as a technique to improve the
performance of the SpMT memory system. This technique does not introduce additional traffic in the bus and improves the performance of a conventional SpMT memory model by 6% on average and up to 21% for some applications. Also, we propose a scheme called Slice Specialization that reduces the
number of instructions in the pre-computation slices by adapting the slice to every single speculative thread spawned.
The later proposal outperforms previous schemes with slices by 15% and overall, both techniques combined achieve an improvement of 20% over a conventional SpMT processor. |
Subject(s):
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-Àrees temàtiques de la UPC::Informàtica::Arquitectura de computadors -Simultaneous multithreading processors -Multithreading -Speculation -TLS -Microprocessadors -Multiprocessadors |
Rights:
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Document type:
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Article - Published version Conference Object |
Published by:
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IEEE Computer Society Publications
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