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SCHEDULE: NOV 16-21, 2014
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Lattice QCD with Domain Decomposition on Intel(R) Xeon Phi(TM) Co-Processors
SESSION: Heterogeneity and Scaling in Applications
EVENT TYPE: Papers
TIME: 10:30AM - 11:00AM
SESSION CHAIR: Justin Luitjens
AUTHOR(S):Simon Heybrock, Balint Joo, Dhiraj D. Kalamkar, Mikhail Smelyanskiy, Karthikeyan Vaidyanathan, Tilo Wettig, Pradeep Dubey
ROOM:393-94-95
ABSTRACT:
The gap between the cost of moving data and the cost of computing
continues to grow, making it ever harder to design iterative solvers on
extreme-scale architectures. This problem can be alleviated by
alternative algorithms that reduce the amount of data movement. We
investigate this in the context of Lattice Quantum Chromodynamics
and implement such an alternative solver algorithm, based on domain
decomposition, on Intel(R) Xeon Phi(TM) co-processor (KNC) clusters. We demonstrate close-to-linear on-chip scaling to all 60 cores of the KNC. With a mix of single- and half-precision the domain-decomposition method sustains 400-500 Gflop/s per chip. Compared to an optimized KNC implementation of a
standard solver [1], our full multi-node domain-decomposition solver
strong-scales to more nodes and reduces the time-to-solution by a factor of 5.
Chair/Author Details:
Justin Luitjens (Chair) - NVIDIA Corporation
Simon Heybrock - University of Regensburg
Balint Joo - Thomas Jefferson National Accelerator Facility
Dhiraj D. Kalamkar - Intel Corporation
Mikhail Smelyanskiy - Intel Corporation
Karthikeyan Vaidyanathan - Intel Corporation
Tilo Wettig - University of Regensburg
Pradeep Dubey - Intel Corporation
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