Electrical & Computer Engineering Research Works

Permanent URI for this collectionhttp://hdl.handle.net/1903/1658

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Author: search.filters.author.Kirovski, Darko

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    Energy Minimization of System Pipelines Using Multiple Voltages
    (IEEE, 1999-05) Qu, Gang; Kirovski, Darko; Potkonjak, Miodrag; Srivastava, Mani B.
    Modem computer and communication system design has to consider the timing constraints imposed by communication and system pipelines, and minimize the energy consumption. We adopt the recent proposed model for communication pipeline latency[23] and address the problem of how to minimize the power consumption in system-level pipelines under the latency constraints by selecting supply voltage for each pipeline stage using the variable voltage core-based system design methodology[l 11. We define the problem, solve it optimally under realistic assumptions and develop algorithms for power minimization of system pipeline designs based on our theoretical results. We apply this new approach on the 4- stage Myrinet GAM pipeline, with the appropriate voltage profiles, we achieve 93.4%, 91.3% and 26.9% power reduction on three pipeline stages over the traditional design.
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    Power Optimization of Variable-Voltage Core-Based Systems
    (IEEE, 1998-06) Hong, Inki; Kirovski, Darko; Qu, Gang; Potkonjak, Miodrag; Srivastava, Mani B.
    The growing class of portable systems, such as personal computing and communication devices, has resulted in a new set of system design requirements, mainly characterized by dominant importance of power minimization and design reuse. The energy efficiency of systems-on-a-chip (SOC) could be much improved if one were to vary the supply voltage dynamically at run time. We develop the design methodology for the lowpower core-based real-time SOC based on dynamically variable voltage hardware. The key challenge is to develop effective scheduling techniques that treat voltage as a variable to be determined, in addition to the conventional task scheduling and allocation. Our synthesis technique also addresses the selection of the processor core and the determination of the instruction and data cache size and configuration so as to fully exploit dynamically variable voltage hardware, which results in significantly lower power consumption for a set of target applications than existing techniques. The highlight of the proposed approach is the nonpreemptive scheduling heuristic, which results in solutions very close to optimal ones for many test cases. The effectiveness of the approach is demonstrated on a variety of modern industrial-strength multimedia and communication applications.
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    Power Optimization of Variable Voltage Core-Based Systems
    (IEEE, 1999-12) Hong, Inki; Kirovski, Darko; Qu, Gang; Potkonjak, Miodrag; Srivastava, Mani B.
    The growing class of portable systems, such as personal computing and communication devices, has resulted in a new set of system design requirements, mainly characterized by dominant importance of power minimization and design reuse. The energy efficiency of systems-on-a-chip (SOC) could be much improved if one were to vary the supply voltage dynamically at run time. We develop the design methodology for the lowpower core-based real-time SOC based on dynamically variable voltage hardware. The key challenge is to develop effective scheduling techniques that treat voltage as a variable to be determined, in addition to the conventional task scheduling and allocation. Our synthesis technique also addresses the selection of the processor core and the determination of the instruction and data cache size and configuration so as to fully exploit dynamically variable voltage hardware, which results in significantly lower power consumption for a set of target applications than existing techniques. The highlight of the proposed approach is the nonpreemptive scheduling heuristic, which results in solutions very close to optimal ones for many test cases. The effectiveness of the approach is demonstrated on a variety of modern industrial strength multimedia and communication applications.