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Argobots, which was developed as a part of the Argo project, is a lightweight, low-level threading and tasking framework to support massive on-node parallelism. It provides high-level runtimes and domain-specific libraries with threading and tasking mechanisms so that they can build their solutions efficiently. Argobots supports two kinds of work units called user-level threads and tasklets. It also exposes hardware resources (e.g., cores or hardware threads) as execution streams (ESs) and provides mapping mechanisms between work units and ESs.