Parallel Sparse Matrix-Vector Multiplication Using Accelerators

Sparse matrix-vector multiplication (SpMV) is an essential computational kernel for many applications such as scientific computing. Recently, the number of computing systems equipped with NVIDIA's GPU and Intel's Xeon Phi coprocessor based on the MIC architecture has been increasing. Therefore, the importance of effective algorithms for SpMV in these systems is increasing. To the best of our knowledge, while previous studies have reported CPU and GPU implementations of SpMV for a cluster and MIC implementations for a single node, implementations of SpMV for the MIC cluster have not yet been reported. In this paper, we implemented and evaluated parallel SpMV on a GPU cluster and a MIC cluster. As shown by the results, the implementation for MIC achieved relatively high performance in some matrices with a single process, but it could not achieve higher performance than other implementations with 64 MPI processes. Therefore, we implemented and evaluated the single SpMV kernel to improve the performance of parallel SpMV.