A FACT-based Approach: Making Machine Learning Collective Autotuning Feasible on Exascale Systems

According to recent performance analyses, MPI collective operations make up a quarter of the execution time on production systems. Machine learning (ML) autotuners use supervised learning to select collective algorithms, significantly improving collective performance. However, we observe two barriers preventing their adoption over the default heuristic-based autotuners. First, a user may find it d...