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Optimierung Des Energieverbrauchs in Echtzeitfahigen, Mehrfadigen Prozessoren

Optimierung Des Energieverbrauchs in Echtzeitfahigen, Mehrfadigen Prozessoren

          
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About the Book

Der Einsatz von prozessorgesteuerten, mobilen Geraten stellt einen stetig wachsenden Markt dar. Um neue, konkurrenzfahige Systeme etablieren zu konnen, mussen diese immer leistungsfahiger und komfortabler werden. Da die meisten mobilen Gerate mit einer Batterie als Energieversorgung arbeiten, wird als Entwicklungsziel unter anderem auch ein geringer Energieverbrauch angestrebt, um moglichst lange Betriebszeiten zu ermoglichen. In dieser Arbeit werden, aufbauend auf dem mehrfadigen, echtzeitfahigen Komodo-Mikrocontroller, zwei unterschiedliche Energiespartechniken vorgestellt, realisiert und evaluiert. Der Komodo-Mikrocontroller besitzt einen Java-Prozessorkern, der je nach Implementierung vier bis 16 Kontrollfaden (Threads) unterstutzt, zwischen denen ohne Zeitverlust gewechselt werden kann. Zudem sind vier verschiedene Echtzeit-Scheduling-Algorithmen integriert, die ein sehr feinkorniges Thread-Scheduling erlauben. Die beiden Energiespar-Techniken stellen ebenfalls vollstandige Hardwarelosungen dar, die keinerlei Software-Overhead erfordern. Sie arbeiten mit den Echtzeit-Parametern der Scheduling-Verfahren Earliest Deadline First und Guaranteed Percentage. Beide Verfahren steuern dynamisch die variable Taktfrequenz und Versorgungsspannung des Mikrocontrollers, ohne dabei das Zeitverhalten der aktiven Threads massgeblich zu beeinflussen bzw. die Echtzeitfahigkeit zu verletzen. Bei der Evaluierung wurden beide Hardware-basierten Energiespar-Techniken mit einem ahnlichen, Software-basierten Ansatz verglichen. Die Ergebnisse zeigen, dass keine pauschale Aussage uber die beste Energiespar-Technik gemacht werden kann; die erzielten Ergebnisse hangen von der vorhandenen Prozessorauslastung und mehr noch, vom zeitlichen Verhaltnis der Threads zueinander ab. Dennoch wird gezeigt, dass der Software-basierte Ansatz sehr viel hartere Anforderungen stellt als die Hardware-basierten Techniken, deren Nichteinhaltung mit sehr grosser Wahrscheinlichkeit zum Verlust der Echtzeitfahigkeit fuhrt.


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Product Details
  • ISBN-13: 9783832505387
  • Publisher: Logos Verlag Berlin
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 0 mm
  • Width: 145 mm
  • ISBN-10: 3832505385
  • Publisher Date: 20 Apr 2004
  • Height: 210 mm
  • No of Pages: 167
  • Series Title: German
  • Weight: 700 gr


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