Mr. Ripal Nathuji Profile

Ripal Nathuji

at Georgia Institute of Technology

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Proceedings Article | 29 January 2007 Paper

Flash on disk for low-power multimedia computing

Leo Singleton, Ripal Nathuji, Karsten Schwan

Proceedings Volume 6504, 65040E (2007) https://doi.org/10.1117/12.705760

KEYWORDS: Multimedia, Operating systems, Video, Computing systems, Algorithm development, Systems modeling, Solid state electronics, Digital photography, Data storage, Manufacturing

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Mobile multimedia computers require large amounts of data storage, yet must consume low power in order to prolong battery life. Solid-state storage offers low power consumption, but its capacity is an order of magnitude smaller than the hard disks needed for high-resolution photos and digital video. In order to create a device with the space of a hard drive, yet the low power consumption of solid-state storage, hardware manufacturers have proposed using flash memory as a write buffer on mobile systems. This paper evaluates the power savings of such an approach and also considers other possible flash allocation algorithms, using both hardware- and software-level flash management. Its contributions also include a set of typical multimedia-rich workloads for mobile systems and power models based upon current disk and flash technology. Based on these workloads, we demonstrate an average power savings of 267 mW (53% of disk power) using hardware-only approaches. Next, we propose another algorithm, termed Energy-efficient Virtual Storage using Application-Level Framing (EVS-ALF), which uses both hardware and software for power management. By collecting information from the applications and using this metadata to perform intelligent flash allocation and prefetching, EVS-ALF achieves an average power savings of 307 mW (61%), another 8% improvement over hardware-only techniques.

Proceedings Article | 29 January 2007 Paper

CompatPM: enabling energy efficient multimedia workloads for distributed mobile platforms

Ripal Nathuji, Keith O'Hara, Karsten Schwan, Tucker Balch

Proceedings Volume 6504, 65040I (2007) https://doi.org/10.1117/12.704761

KEYWORDS: Multimedia, Distributed computing, Robots, Computing systems, Telecommunications, Sensors, Mobile robots, Control systems, Computer programming, Mobile communications

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The computation and communication abilities of modern platforms are enabling increasingly capable cooperative distributed mobile systems. An example is distributed multimedia processing of sensor data in robots deployed for search and rescue, where a system manager can exploit the application's cooperative nature to optimize the distribution of roles and tasks in order to successfully accomplish the mission. Because of limited battery capacities, a critical task a manager must perform is online energy management. While support for power management has become common for the components that populate mobile platforms, what is lacking is integration and explicit coordination across the different management actions performed in a variety of system layers. This papers develops an integration approach for distributed multimedia applications, where a global manager specifies both a power operating point and a workload for a node to execute. Surprisingly, when jointly considering power and QoS, experimental evaluations show that using a simple deadline-driven approach to assigning frequencies can be non-optimal. These trends are further affected by certain characteristics of underlying power management mechanisms, which in our research, are identified as groupings that classify component power management as "compatible" (VFC) or "incompatible" (VFI) with voltage and frequency scaling. We build on these findings to develop CompatPM, a vertically integrated control strategy for power management in distributed mobile systems. Experimental evaluations of CompatPM indicate average energy improvements of 8% when platform resources are managed jointly rather than independently, demonstrating that previous attempts to maximize battery life by simply minimizing frequency are inappropriate from a platform-level perspective.

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