%0 Conference Paper %B Workshop on Exascale MPI (ExaMPI) at SC19 %D 2019 %T Impacts of Multi-GPU MPI Collective Communications on Large FFT Computation %A Alan Ayala %A Stanimire Tomov %A Xi Luo %A Hejer Shaiek %A Azzam Haidar %A George Bosilca %A Jack Dongarra %K Collective MPI %K Exascale applications %K FFT %K Heterogeneous systems %K scalable %B Workshop on Exascale MPI (ExaMPI) at SC19 %C Denver, CO %8 2019-11 %G eng