Università
della
Svizzera
italiana
Rethinking large-scale economic modeling for efficiency: optimizations for GPU and Xeon Phi clusters
Additional information
Authors
Scheidegger S.,
Mikushin . D. .,
Kuebler F.,
Schenk O.
Type
Article in conference proceedings
Year
2018
Language
English
Abstract
We propose a massively parallelized and optimized framework to solve high-dimensional dynamic stochastic economic models on modern GPU-and KNL-based clusters. First, we introduce a novel approach for adaptive sparse grid index compression alongside a surplus matrix reordering, which significantly reduces the global memory throughput of the compute kernels and maps randomly accessed data onto cache or fast shared memory. Second, we fully vectorize the compute kernels for AVX, AVX2 and AVX512 CPUs, respectively. Third, we develop a hybrid cluster oriented work-preempting scheduler based on TBB, which evenly distributes the time iteration workload onto available CPU cores and accelerators. Numerical experiments on Cray XC40 KNL "Grand Tave" and on Cray XC50 "Piz Daint" systems at the Swiss National Supercomputer Centre (CSCS) show that our framework scales nicely to at least 4,096 compute nodes, resulting in an overall speedup of more than four orders of magnitude compared to a single, optimized CPU thread. As an economic application, we compute global solutions to an annually calibrated stochastic public finance model with sixteen discrete, stochastic states with unprecedented performance.
Conference proceedings
IEEE International Parallel & Distributed Processing Symposium (IPDPS'18)
Month
May
Publisher
In Proceedings of the 32nd IEEE International Parallel & Distributed Processing Symposium (IPDPS'18)
Start page number
610
End page number
619
Meeting name
IEEE International Parallel & Distributed Processing Symposium (IPDPS'18)
Meeting place
Vancouver, Canada
Meeting date
May 25-29, 2018
Keywords
High-Performance Computing, Macroeconomics, Public Finance, Adaptive Sparse Grids, Heterogeneous Systems, GPUs, MICs
