Since the days of OpenMP 1.0 computer hardware has become more complex,
typically by specializing compute units for coarse- and fine-grained
parallelism in incrementally deeper hierarchies of parallelism. Newer versions
of OpenMP reacted by introducing new mechanisms for querying or controlling its
individual levels, each time adding another concept such as places, teams, and
progress groups. In this paper we propose going back to the roots of OpenMP in
the form of nested parallelism for a simpler model and more flexible handling
of arbitrary deep hardware hierarchies.Comment: IWOMP'23 preprin