Multi GPU Sparse Matrix by Sparse Matrix Multiplication

The paper focuses on the improvement of the existing nsparse Nagasaka et al. algorithm and its extension to the multi-GPU setting for the application of real engineering problems. In this work, we propose a distributed multi-GPU framework for SpGEMM that is designed specifically for the nsparse like algorithms. The results show ∼2 times speed-up for nsparse and close to ideal scalability of the multi-GPU extension with the number of GPUs. Finally, we test the proposed algorithm in the AMG setting by computing the double SpGEMM product.