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DOE OSTI · 2587617

Parallel Runtime Interface for Fortran (PRIF) Specification (Rev. 0.6)

Bonachea, Dan [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)]·Rasmussen, Katherine [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)]·Rouson, Damian [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)]·Richardson, Bradley [National Aeronautics and Space Administration (NASA), Washington, DC (United States)]·Pailleux, Jean-Didier [SiPearl, Maisons-Laffitte (France)]·Renault, Etienne [SiPearl, Maisons-Laffitte (France)]
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Abstract

This document specifies an interface to support the multi-image parallelism features of Fortran, named the Parallel Runtime Interface for Fortran (PRIF). PRIF is a solution in which a runtime library is primarily responsible for implementing coarray allocation, deallocation and accesses, image synchronization, atomic operations, events, teams and collective subroutines. The Fortran compiler is responsible for transforming the invocation of Fortran-level multi-image parallelism features into procedure calls to the necessary PRIF subroutines. The interface is designed for portability across shared- and distributed-memory machines, different operating systems, and multiple architectures. Implementations of this interface are intended as an augmentation for the compiler's own runtime library. With an implementation-agnostic interface, alternative parallel runtime libraries may be developed that support the same interface. One benefit of this approach is the ability to vary the communication substrate. A central aim of this document is to define a parallel runtime interface in standard Fortran syntax, which enables us to leverage Fortran to succinctly express various properties of the procedure interfaces, including argument attributes.

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Bonachea, Dan [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Rasmussen, Katherine [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Rouson, Damian [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Richardson, Bradley [National Aeronautics and Space Administration (NASA), Washington, DC (United States)], Pailleux, Jean-Didier [SiPearl, Maisons-Laffitte (France)], Renault, Etienne [SiPearl, Maisons-Laffitte (France)]. 2025-09-16. Parallel Runtime Interface for Fortran (PRIF) Specification (Rev. 0.6). https://doi.org/10.25344/s4m01x

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