Criticality Driven Energy Aware Speculation for Speculative Multithreaded Processors

Nagpal, Rahul and Bhowmik, Anasua (2005) Criticality Driven Energy Aware Speculation for Speculative Multithreaded Processors. In: High Performance Computing - Hipc 2005, Proceedings, December 18-21, 2005., Goa, India.

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Abstract

Speculative multithreaded architecture (SpMT) philosophy relies on aggressive speculative execution for improved performance. Aggressive speculative execution results in a significant wastage of dynamic energy due to useless computation in the event of mis-speculation. As energy consumption is becoming an important constraint in microprocessor design, it is extremely important to reduce such wastage of dynamic energy in SpMT processors in order to achieve a better performance to power ratio. Dynamic instruction criticality information can be effectively applied to control aggressive speculation in SpMT processors. In this paper, we present a model of micro-execution for SpMT processors to determine dynamic instruction criticality. We also present two novel techniques utilizing criticality information, namely delaying non-critical loads and criticality based thread-prediction for reducing useless computation and energy consumption. Our experiments show 17.71% and 11.63% reduction in dynamic energy for criticality based thread prediction and criticality based delayed load scheme respectively while the corresponding improvements in dynamic energy delay products are 13.93% and 5.54%.

Item Type:	Conference Paper
Publisher:	Springer-Verlag Berlin
Additional Information:	Copyright of this article belongs to Springer-Verlag Berlin.
Department/Centre:	Division of Electrical Sciences > Computer Science & Automation
Date Deposited:	05 Mar 2009 06:33
Last Modified:	19 Sep 2010 04:54
URI:	http://eprints.iisc.ac.in/id/eprint/16906

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