SC13 Home > SC13 Schedule > SC13 Presentation - A Large-Scale Cross-Architecture Evaluation of Thread-Coarsening

SCHEDULE: NOV 16-22, 2013

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A Large-Scale Cross-Architecture Evaluation of Thread-Coarsening

SESSION: GPU Programming


TIME: 11:00AM - 11:30AM

SESSION CHAIR: Michael Garland

AUTHOR(S):Alberto Magni, Christophe Dubach, Michael F.P. O'Boyle


OpenCL has become the de facto data parallel programming model for parallel devices in todays high-performance supercomputers. OpenCL was designed with the goal of guaranteeing program portability across hardware from different vendors. However, achieving good performance is hard, requiring manual tuning of the program and expert knowledge of each target device. In this paper we consider a data parallel compiler transformation thread-coarsening and evaluate its effects across a range of devices by developing a source-to-source OpenCL compiler based on LLVM. We thoroughly evaluate this transformation on 17 benchmarks and five platforms with different coarsening parameters giving over 43,000 different experiments. We achieve speedups over 9x on individual applications and average speedups ranging from 1.15x on the NVIDIA Kepler GPU to 1.50x on the AMD Cypress GPU. Finally, we use statistical regression to analyze and explain program performance in terms of hardware-based performance counters.

Chair/Author Details:

Michael Garland (Chair) - NVIDIA

Alberto Magni - University of Edinburgh

Christophe Dubach - University of Edinburgh

Michael F.P. O'Boyle - University of Edinburgh

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The full paper can be found in the ACM Digital Library