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We present TaskTorrent, a lightweight distributed task-based runtime in C++.TaskTorrent uses a parametrized task graph to express the task DAG, andone-sided active messages to trigger remote tasks asynchronously. As a resultthe task DAG is completely distributed and discovered in parallel. It is aC++14 library and only depends on MPI. We explain the API and theimplementation. We perform a series of benchmarks against StarPU and ScaLAPACK.Micro benchmarks show it has a minimal overhead compared to other solutions. Wethen apply it to two large linear algebra problems. TaskTorrent scales verywell to thousands of cores, exhibiting good weak and strong scalings.

TaskTorrent: a Lightweight Distributed Task-Based Runtime System in C++