SCHEDULE: NOV 16-22, 2013
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Exploring the Structure of the Nucleus Using GPUs
SESSION: HPC applications
EVENT TYPE: HPC Interconnections, Broader Engagement
TIME: 10:30AM - 11:00AM
SESSION CHAIR: Sadaf R. Alam
Presenter(s):M. A. Clark
ROOM:705/707/709/711
ABSTRACT:
The exponential growth of floating-point power in GPUs, combined with high memory bandwidth, has given rise to an attractive platform upon which to deploy HPC applications. When it comes to legacy applications there is a danger that entire codebases have to be rewritten to fully embrace this computational power. In this session we discuss how to efficiently port legacy lattice quantum-chromodynamics (LQCD) applications, e.g., MILC and Chroma, onto GPUs avoiding this rewriting overhead. The approach taken is a community-wide library (QUDA) which provides high-performance implementations for the time-critical LQCD algorithms thereby providing instant GPU acceleration. We discuss some of the bleeding-edge strategies taken by QUDA to maximize performance, including the use of communication reducing algorithms, mixed-precision methods and an aggressive auto-tuning methodology. We discuss various compile-and-run strategies to circumvent Amdahl's law, including the use OpenACC directives or retargeting the underlying DSL to generate GPU code directly from the original source.
Chair/Presenter Details:
Sadaf R. Alam (Chair) - Swiss National Supercomputing Centre
M. A. Clark - NVIDIA Corporation
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