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# Multi-Image Parallel Fortran Runtime


The Parallel Runtime Interface for Fortran (PRIF) defines an
interface designed for LLVM Flang to target implementations of
Fortran's multi-image parallel features.

The current revision of the PRIF specification is here:
<https://doi.org/10.25344/S46S3W>

Library implementations of PRIF include:

* [Caffeine](https://go.lbl.gov/caffeine) - portable open-source implementation targeting shared- and distributed-memory systems running Linux or macOS