Banca de DEFESA: CARLOS AVELINO DE BARROS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : CARLOS AVELINO DE BARROS
DATA : 13/07/2016
HORA: 14:00
LOCAL: DCA sala 2
TÍTULO:

Energy Reduction for Parallel Applications in Multi-core Architectures

PALAVRAS-CHAVES:

energy savings. modeling of electric power. multi-core processors.

PÁGINAS: 214
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
RESUMO:

The period that lasted from the advent of microprocessors until early this century was marked by the geometric expansion of their operating frequency. If on one hand it provided continuous performance increases, on the other hand it was also responsible for a problematic growth in heating and energy consumption. In attempt to mitigate these problems, multi-core processors have been used extensively in replacement for single-core processors, offering a viable alternative to increase performance without increasing frequency. As a way of mapping energy consumption, we present the development of two sets of mathematical models for the representation of the electrical power dissipated in the processors. According to considerations we made in relation to static and dynamic parts of the power, we established an equation for the total power as a function of the operating frequency of the respective analyzed processors. We demonstrate, based on these mathematical models, that the relative energy consumption of processors can be related to parallel processing performance measures, such as speedup and efficiency. We also use the models to monitor the influence of several factors on the reduction of energy consumption in multi-core processors, such as the percentage of the parallel portion of the code, the number of cores to be used each time, the working frequency and speedup itself. Results of the analyzes confirm the theoretical predictions and alert to the possibility of improving the energy performance of multi-core processors, especially in conditions in which the factors of influence can be made flexible.

MEMBROS DA BANCA:
Presidente - 1673543 - SAMUEL XAVIER DE SOUZA
Interno - 2140683 - DIOMADSON RODRIGUES BELFORT
Interno - 1543191 - LUIZ FELIPE DE QUEIROZ SILVEIRA
Externo à Instituição - CARLOS ALBERTO VALDERRAMA SAKUYAMA - UMONS
Externo à Instituição - RAFAEL VIDAL AROCA - UFSCAR