Cyclops Tensor Framework: Reducing Communication and Eliminating Load Imbalance in Massively Parallel Contractions
Citations Over TimeTop 10% of 2013 papers
Abstract
Cyclops (cyclic-operations) Tensor Framework (CTF) 1 is a distributed library for tensor contractions. CTF aims to scale high-dimensional tensor contractions such as those required in the Coupled Cluster (CC) electronic structure method to massively-parallel supercomputers. The framework preserves tensor structure by subdividing tensors cyclically, producing a regular parallel decomposition. An internal virtualization layer provides completely general mapping support while maintaining ideal load balance. The mapping framework decides on the best mapping for each tensor contraction at run-time via explicit calculations of memory usage and communication volume. CTF employs a general redistribution kernel, which transposes tensors of any dimension between arbitrary distributed layouts, yet touches each piece of data only once. Sequential symmetric contractions are reduced to matrix multiplication calls via tensor index transpositions and partial unpacking. The user-level interface elegantly expresses arbitrary-dimensional generalized tensor contractions in the form of a domain specific language. We demonstrate performance of CC with single and double excitations on 8192 nodes of Blue Gene/Q and show that CTF outperforms NWChem on Cray XE6 supercomputers for benchmarked systems.
Related Papers
- → ℋ-tensors and nonsingular ℋ-tensors(2015)45 cited
- → Large-scale simulation of the three-dimensional Navier-Stokes equations(1992)2 cited
- → Electromagnetic scattering simulations using overset grids on massively parallel computing platforms(2002)1 cited
- → Studies on the Efficiency of Massively Parallel Computational Method for Large-Scale Computation based on Unstructured Grid(1996)
- → M3E_LINSOL: A Scalable Linear Solver Package for Reservoir Simulations on Massively Parallel Computers(2017)