Contributions to the efficient use of general purpose coprocessorskernel density estimation as case study
- José Miguel Alonso Director/a
- Alexander Mendiburu Alberro Director/a
Universidad de defensa: Universidad del País Vasco - Euskal Herriko Unibertsitatea
Fecha de defensa: 19 de junio de 2015
- Clemente Rodríguez Lafuente Presidente/a
- Jon Sáenz Aguirre Secretario/a
- José Ángel Gregorio Monasterio Vocal
- Diego López de Ipiña González de Artaza Vocal
- Leonel Augusto Pires Seabara de Sousa Vocal
Tipo: Tesis
Resumen
The high performance computing landscape is shifting from assemblies of homogeneous nodes towards heterogeneous systems, in which nodes consist of a combination of traditional out-of-order execution cores and accelerator devices. Accelerators provide greater theoretical performance compared to traditional multi-core CPUs, but exploiting their computing power remains as a challenging task.This dissertation discusses the issues that arise when trying to efficiently use general purpose accelerators. As a contribution to aid in this task, we present a thorough survey of performance modeling techniques and tools for general purpose coprocessors. Then we use as case study the statistical technique Kernel Density Estimation (KDE). KDE is a memory bound application that poses several challenges for its adaptation to the accelerator-based model. We present a novel algorithm for the computation of KDE that reduces considerably its computational complexity, called S-KDE. Furthermore, we have carried out two parallel implementations of S-KDE, one for multi and many-core processors, and another one for accelerators. The latter has been implemented in OpenCL in order to make it portable across a wide range of devices. We have evaluated the performance of each implementation of S-KDE in a variety of architectures, trying to highlight the bottlenecks and the limits that the code reaches in each device. Finally, we present an application of our S-KDE algorithm in the field of climatology: a novel methodology for the evaluation of environmental models.