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A dynamic compilation framework for controlling microprocessor energy and performance

A dynamic compilation framework for controlling microprocess...

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IEEE/ACM International Symposium on Microarchitecture (MICRO)

作者： Qiang Wu V.J. Reddi Youfeng Wu Jin Lee D. Connors D. Brooks M. Martonosi D.W. Clark Depts. of Computer Science Electrical Engineering Princeton University USA Department of Electrical and Computer Engineering University of Colorado Boulder USA Programming Systems Laboratory Intel Corporation USA Division of Engineering and Applied Science Harvard University USA

Dynamic voltage and frequency scaling (DVFS) is an effective technique for controlling microprocessor energy and performance. Existing DVFS techniques are primarily based on hardware, OS time-interrupts, or static-compiler techniques. However, substantially greater gains can be realized when control opportunities are also explored in a dynamic compilation environment. There are several advantages to deploying DVFS and managing energy/performance tradeoffs through the use of a dynamic compiler. Most importantly, dynamic compiler driven DVFS is fine-grained, code-aware, and adaptive to the current microarchitecture environment. This paper presents a design framework of the run-time DVFS optimizer in a general dynamic compilation system. A prototype of the DVFS optimizer is implemented and integrated into an industrial-strength dynamic compilation system. The obtained optimization system is deployed in a real hardware platform that directly measures CPU voltage and current for accurate power and energy readings. Experimental results, based on physical measurements for over 40 SPEC or Olden benchmarks, show that significant energy savings are achieved with little performance degradation. SPEC2K FP benchmarks benefit with energy savings of up to 70% (with 0.5% performance loss). In addition, SPEC2K INT show up to 44% energy savings (with 5% performance loss), SPEC95 FP save up to 64% (with 4.9% performance loss), and Olden save up to 61% (with 4.5% performance loss). On average, the technique leads to an energy delay product (EDP) improvement that is 3times-5times better than static voltage scaling, and is more than 2times (22% vs. 9%) better than the reported DVFS results of prior static compiler work. While the proposed technique is an effective method for microprocessor voltage and frequency control, the design framework and methodology described in this paper have broader potential to address other energy and power issues such as di/dt and thermal control

关键词： Dynamic compiler Microprocessors Performance loss Voltage control Hardware Energy measurement Dynamic voltage scaling Frequency Energy management Microarchitecture

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Optimal dynamic neurocontrol of a gate-controlled series capacitor in a multi-machine power system

Optimal dynamic neurocontrol of a gate-controlled series cap...

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International Conference on Intelligent systems Applications to Power systems (ISAP)

作者： S. Ray G.K. Venayagamoorthy E.H. Watanabe F.D. de Jesus Real-Time Power and Intelligent Systems (RTPIS) Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA Department of Electrical Engineering Federal University of Rio Grande do Sul Brazil

This paper presents the design of an optimal dynamic neurocontroller for a new type of FACTS device - the gate controlled series capacitor (GCSC) incorporated in a multi-machine power system. The optimal neurocontroller is developed based on the heuristic dynamic programming (HDP) approach. In addition, a dynamic identifier/model and controller structure using the recurrent neural network trained with backpropagation through time (BPTT) is employed. Simulation results are presented to show the effectiveness of the dynamic neurocontroller and its performance is compared with that of the conventional PI controller under small and large disturbances

关键词： Power system dynamics Capacitors Power systems Neurocontrollers Power system modeling Power system simulation Optimal control Control systems Dynamic programming Recurrent neural networks

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A retraining methodology for enhancing agent intelligence

A retraining methodology for enhancing agent intelligence

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International Conference on Integration of Knowledge Intensive Multi-Agent systems (KIMAS)

作者： P.A. Mitkas A.L. Symeonidis I.N. Athanasiadis Intelligent Systems and Software Engineering Laboratory Informatics and Telematics Institute CERTH Thessaloniki Greece Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

Data mining has proven a successful gateway for discovering useful knowledge and for enhancing business intelligence in a range of application fields. Incorporating this knowledge into already deployed applications, though, is highly impractical, since it requires reconfigurable software architectures, as well as human expert consulting. In an attempt to overcome this deficiency, we have developed agent academy, an integrated development framework that supports both design and control of multiagent systems (MAS), as well as agent training. We define agent training as the automated incorporation of logic structures generated through data mining into the agents of the system. The increased flexibility and cooperation primitives of MAS, augmented with the training and retraining capabilities of agent academy, provide a powerful means for the dynamic exploitation of data mining extracted knowledge. In this paper, we present the methodology and tools for agent retraining. Through experimental results with the agent academy platform, we demonstrate how the extracted knowledge can be formulated and how retraining can lead to the improvement - in the long run - of agent intelligence.

关键词： Intelligent agent Delta modulation Data mining Humans Companies Application software Software architecture Multiagent systems Reconfigurable logic Collaborative software

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Design and experimental validation of a multiphase VRM controller

Design and experimental validation of a multiphase VRM contr...

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作者： Mazumder, S.K. Kamisetty, S.L. Laboratory for Energy and Switching-Electronics Systems Department of Electrical and Computer Engineering University of Illinois 851 S Morgan St 1020 SEO Chicago IL 60607 United States Servo Tech Inc. 1747 W. Roosevelt Road Chicago IL 60680 United States

By combining the concepts of multiple-sliding-surface and integral-variable-structure controls, one can develop a robust controller for a multiphase 9V VRM, which comprises four parallel DC-DC synchronous buck converters operating at 300kHz. The advantages of the control scheme are its simplicity in design, good dynamic response, robustness, ability to nullify the bus-voltage error and the error between the load currents of the converter modules, and ability to reduce the impact of high-frequency dynamics due to parasitics on the closed-loop control system. Unlike a conventional variable-structure controller (VSC), which achieves superior transient performance by optimising (and hence, by varying) the switching frequency, the novel controller is able to retain the excellent dynamic performance of a conventional VSC and yet maintain a constant-frequency operation of a PWM controller under 'steady-state' condition. The latter is achieved by obtaining a duty-ratio signal;however, unlike a PWM controller, the new controller calculates the duty ratio based on Lyapunov's stability crietrion. Thus, the new controller also permits interleaved operation of the VRM modules. © IEE, 2005.

关键词： Control equipment

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A High Performance, Energy Efficient GALS ProcessorMicroarchitecture with Reduced Implementation Complexity

A High Performance, Energy Efficient GALS ProcessorMicroarch...

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IEEE International Symposium on Performance Analysis of systems and Software

作者： YongKang Zhu D.H. Albonesi A. Buyuktosunoglu Department of Electrical and Computer Engineering University of Rochester USA Computer Systems Laboratory Cornell University USA IBM Thomas J. Watson Research Center USA

As the costs and challenges of global clock distribution grow with each new microprocessor generation, a globally asynchronous, locally synchronous (GALS) approach becomes an attractive alternative. One proposed GALS approach, called a multiple clock domain (MCD) processor, achieves impressive energy savings for a relatively low performance cost. However, the approach requires separating the processor into four domains, including separating the integer and memory domains which complicates load scheduling, and the implementation of 32 voltage and frequency levels in each domain. In addition, the hardware-based control algorithm, though effective overall, produces a significant performance degradation for some applications. In this paper, we devise modifications to the MCD design that retain many of its benefits while greatly reducing the implementation complexity. We first determine that the synchronization channels that are most responsible for the MCD performance degradation are those involving cache access, and propose merging the integer and memory domains to virtually eliminate this overhead. We further propose significantly reducing the number of voltage levels, separating the reorder buffer into its own domain to permit front-end frequency scaling, separating the L2 cache to permit standard power optimizations to be used, and a new online algorithm that provides consistent results across our benchmark suite. The overall result is a significant reduction in the performance degradation of the original MCD approach and greater energy savings, with a greatly simplified microarchitecture that is much easier to implement

关键词： Energy efficiency Degradation Costs Clocks Voltage Microprocessors Synchronous generators Processor scheduling Frequency synchronization Merging

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Robust open-loop downlink beamforming with time-switched diversity

Robust open-loop downlink beamforming with time-switched div...

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IEEE Conference on Vehicular Technology (VTC)

作者： D.J. Lyons S.W. Ellingson Wireless Networking Business Unit Cisco Systems Inc. Richfield OH USA Bradley Department of Electrical & Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

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Five-phase interior permanent magnet motor with low torque pulsation

Five-phase interior permanent magnet motor with low torque p...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： L. Parsa H.A. Toliyat Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA Advanced Electric Machines & Power Electronics Laboratory Department of Electrical Engineering Texas A and M University College Station TX USA

High torque pulsation is the major disadvantage of most IPM motor configurations. Choosing proper number of stator slots and winding distribution as well as increasing number of phases are among the possible solutions for reducing torque pulsation. In this paper, five-phase interior permanent magnet motor with fractional-slot stator is studied. It is shown that despite other IPM motors; the proposed five-phase IPM motor with fractional slot has a very low torque pulsation. For comparison purposes, a five-phase IPM motor with 20 stator slots which is a common configuration for four pole five-phase motors is also considered. It is shown that the torque pulsation of the proposed fractional-slot five-phase IPM motor is much lower than the five-phase IPM motor with 20 stator slots. Nonlinear finite element method is used to analyze different machine configuration. A prototype four pole, five-phase IPM motor with 15 stator slots has been built and is used for experimental verification.

关键词： Permanent magnet motors Torque Reluctance motors Rotors Forging Stator windings Magnetic flux Induction motors Inverters Power engineering computing

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Recognizing interaction from a robot's perspective

Recognizing interaction from a robot's perspective

引用

IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： T. Salter F. Michaud K. Dautenhahn D. Letourneau S. Caron LABORIUS-Research Laboratory on Mobile Robotics and Intelligent Systems Department of Electrical Engineering and Computer Engineering Université de Sherbrook Sherbrooke QUE Canada Adaptive Systems Research Group School of Computer Science University of Herfordshire Hatfield UK

For meaningful interaction between a robot and a human, an autonomous robot must recognize whether the experienced situation is created by people or by the environment. Using only proprioceptive data from a mobile robotic platform, we discover that it is possible to distinguish sensory data patterns involving interaction. These patterns are obtained whilst navigating varying environments, both human populated and unpopulated. The paper reports the initial set of trials using Roball, a spherical mobile robot. Also described is the experimental methodology currently followed to validate the hypothesis that child interaction can be perceived directly from navigation sensors onboard a robotic platform.

关键词： Robot sensing systems Mobile robots Human robot interaction Navigation Intelligent robots Sensor phenomena and characterization Infrared sensors Educational institutions Plastics Mobile computing

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A haptic interface for human-in-the-loop manipulation at the nanoscale 1

A haptic interface for human-in-the-loop manipulation at the...

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1st Joint Eurohaptics Conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator systems - World Haptics Conference, WHC 2005

作者： Tan, Hong Z. Walker, Laron Reifenberger, Ron Mahadoo, Sorubh Chiu, George Raman, Arvind Helser, Aron Colilla, Pablo Haptic Interface Res. Lab School of Electrical and Computer Engineering United States Nanophysics Laboratory Department of Physics Purdue University West LafayetteIN47907 United States Spira Laboratories for Electromechanical Systems School of Mechanical Engineering United States 3rdTech Chapel HillNC United States Nanotec Electronica Spain

ISBN: (纸本)0769523102

This paper outlines major challenges that we are facing in interfacing a human user with objects in the nanoworld via a haptic interface. After a review of prior efforts at haptically-enabled nanomanipulation systems, we present the current state of our nanomanipulator system. We then discuss current research issues including the direct-Z mode, force modeling, data transfer rates and the stability of the haptic interface. Results of nanomanipulation of single-walled carbon nanotubes are presented. It is our hope that the insight gained by the human user of a haptic interface to SPM leads to scanning algorithms that can automatically adjust the SPM parameters based on the properties of the nanosample and the substrate under investigation. © 2005 IEEE.

关键词： Haptic interfaces

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Field Weakening Operation of High Torque Density Five-Phase Permanent Magnet Motor Drives

Field Weakening Operation of High Torque Density Five-Phase ...

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： L. Parsa N. Kim H.A. Toliyat Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA Department of Electrical Engineering Advanced Electric Machines & Power Electronics Laboratory Texas A and M University College Station TX USA

This paper investigates the field weakening operation of a five-phase permanent magnet motor. The proposed motor has concentrated windings such that the produced back-EMF is almost trapezoidal. The motor is supplied with the combined sinusoidal plus third harmonic of currents. This motor, while generating the same average torque as an equivalent permanent magnet brushless DC motor, overcomes its disadvantages. It is shown that torque producing and flux producing components of current for this motor can be decoupled by using multiple reference frame transformation. Therefore, vector control is easily applicable to the motor. Field weakening algorithm is derived and implemented. This motor benefits from high torque density of a BLDC motor below the rated speed and controllability of PMSM above the rated speed and during the field weakening region. Simulation and experimental results are provided to prove the validity of the superior performance of this drive

关键词： Torque Permanent magnet motors Brushless DC motors Synchronous motors DC motors Brushless motors Stator windings Wounds Machine vector control Controllability

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