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Toward A Standard Interface for User-Defined Scheduling in OpenMP

Type of publication Peer-reviewed
Publikationsform Proceedings (peer-reviewed)
Author Ciorba Florina M. , Kale Vivek, Iwainsky Christian, Klemm Michael, Müller Korndörfer Jonas H.,
Project Multilevel Scheduling in Large Scale High Performance Computers
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Proceedings (peer-reviewed)

Title of proceedings International Workshop on OpenMP (IWOMP)
Place Auckland, New Zealand

Open Access

URL https://arxiv.org/abs/1906.08911
Type of Open Access Repository (Green Open Access)

Abstract

Parallel loops are an important part of OpenMP programs. Efficient scheduling of parallel loops can improve performance of the programs. The current OpenMP specification only offers three options for loop scheduling, which are insufficient in certain instances. Given the large number of other possible scheduling strategies, standardizing each of them is infeasible. A more viable approach is to extend the OpenMP standard to allow a user to define loop scheduling strategies within her application. The approach will enable standard-compliant application-specific scheduling. This work analyzes the principal components required by user-defined scheduling and proposes two competing interfaces as candidates for the OpenMP standard. We conceptually compare the two proposed interfaces with respect to the three host languages of OpenMP, i.e., C, C++, and Fortran. These interfaces serve the OpenMP community as a basis for discussion and prototype implementation supporting user-defined scheduling in an OpenMP library.
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