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Porting of the DBCSR library for Sparse Matrix-Matrix Mul...
Iain Bethune, Andeas Gloess, Juerg Hutter, Alfio Lazzaro, Hans P · 2017-08-12 · via cs.DC updates on arXiv.org

Multiplication of two sparse matrices is a key operation in the simulation of the electronic structure of systems containing thousands of atoms and electrons. The highly optimized sparse linear algebra library DBCSR (Distributed Block Compressed Sparse Row) has been specifically designed to efficiently perform such sparse matrix-matrix multiplications. This library is the basic building block for linear scaling electronic structure theory and low scaling correlated methods in CP2K. It is parallelized using MPI and OpenMP, and can exploit GPU accelerators by means of CUDA. We describe a performance comparison of DBCSR on systems with Intel Xeon Phi Knights Landing (KNL) processors, with respect to systems with Intel Xeon CPUs (including systems with GPUs). We find that the DBCSR on Cray XC40 KNL-based systems is 11%-14% slower than on a hybrid Cray XC50 with Nvidia P100 cards, at the same number of nodes. When compared to a Cray XC40 system equipped with dual-socket Intel Xeon CPUs, the KNL is up to 24% faster.

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