@conference {1403, title = {Impacts of Multi-GPU MPI Collective Communications on Large FFT Computation}, booktitle = {Workshop on Exascale MPI (ExaMPI) at SC19}, year = {2019}, month = {2019-11}, address = {Denver, CO}, keywords = {Collective MPI, Exascale applications, FFT, Heterogeneous systems, scalable}, author = {Alan Ayala and Stanimire Tomov and Xi Luo and Hejer Shaiek and Azzam Haidar and George Bosilca and Jack Dongarra} }