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Framework for Extensible Asynchronous Task Scheduling

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[This document is formatted with GitHub-Flavored Markdown.              ]:#
[For better viewing, including hyperlinks, read it online at            ]:#
[https://github.com/sourceryinstitute/FEATS/blob/master/README.md]:#
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![Sourcery Institute][sourcery-institute logo]

Framework for Extensible Asynchronous Task Scheduling (FEATS)
=============================================================

[![GitHub license][license img]](https://raw.githubusercontent.com/sourceryinstitute/FEATS/main/LICENSE)
[![GitHub release][release img]](https://github.com/sourceryinstitute/FEATS/releases/latest)
[![Download as PDF][pdf img]](https://md2pdf.herokuapp.com/sourceryinstitute/FEATS/blob/master/README.pdf)

</div>

Overview
--------
FEATS is a project to develop a parallel [Fortran 2018] asynchronous, task-scheduling framework for use in a range of applications.
The goal is that an application developer need only define their tasks and dependencies between them,
and the framework takes care of executing the in an efficient manner and performing the communications necessary to provide the output of previous tasks to the next task(s) that need it.

Getting Started
---------------
Please see the [example] directory for a demonstration use case in which FEATS traverses a DAG that describes the module dependencies within FEATS itself and reports on task completion at each step.
In this simple example, the task completion is simply printing what file could have been compiled at the corresponding step.
No actual compiling happens, but this use case describes what would happen if FEATS were to be used to enable the Fortran Package Manager [`fpm`] to perform parallel builds.

With `fpm`, the GNU Fortran compiler ([`gfortran`]), and [OpenCoarrays] installed,
build FEATS and run the example program by executing the following command in a `bash`-like shell:
```
git clone https://github.com/sourceryinstitute/FEATS
cd FEATS
fpm run --example --compiler caf --runner "cafrun -n 4"
```
Change `4` above to the number of images that you would like to launch in parallel.

Documentation
-------------
Please visit the [FEATS GitHub Pages site] to see HTML documentation generated
with [`ford`].

Dependencies
-------------
The [`fpm.toml`] manifest describes the FEATS user and developer dependencies
and directs `fpm` to download and build the dependency packages automatically.

Testing
-------
To build and execute the FEATS test suite, run the following command in a
`bash`-like shell:
```
fpm test --compiler caf --runner "cafrun -n 4"
```

Please report any test failures or other [issues].

Acknowledgments
----------------

| | |
|-|-|
| We gratefully acknowledge support from [NASA Langley Research Center] under contract number 80NSSC20P2246.  | <img src="https://user-images.githubusercontent.com/13108868/112893191-304ce180-908f-11eb-8bea-e0cab5322aa8.png" alt="NASA logo" width="100">|

Donate
------
If you find this software useful, please consider donating code or
[currency](http://bit.ly/donate-to-sourcery-institute) to aid in development efforts.

---

[![GitHub forks](https://img.shields.io/github/forks/sourceryinstitute/FEATS.svg?style=social&label=Fork)](https://github.com/sourceryinstitute/FEATS/fork)
[![GitHub stars](https://img.shields.io/github/stars/sourceryinstitute/FEATS.svg?style=social&label=Star)](https://github.com/sourceryinstitute/FEATS)
[![GitHub watchers](https://img.shields.io/github/watchers/sourceryinstitute/FEATS.svg?style=social&label=Watch)](https://github.com/sourceryinstitute/FEATS)

</div>

[Hyperlinks]:#

[Overview]: #overview
[Prerequisites]: #prerequisites
[Downloading, building, and testing]: #downloading-building-and-testing
[Acknowledgments]: #acknowledgments
[Donate]: #donate

[`fpm`]: https://github.com/fortran-lang/fpm
[`fpm.toml`]: ./fpm.toml
[`gfortran`]: https://gcc.gnu.org
[OpenCoarrays]: https://github.com/sourceryinstitute/opencoarrays
[OLTARIS]: https://oltaris.nasa.gov
[example]: ./example
[FEATS GitHub Pages site]: https://sourceryinstitute.github.io/FEATS/
[`ford`]: https://github.com/Fortran-FOSS-Programmers/ford
[Fortran 2018]: https://j3-fortran.org/doc/year/18/18-007r1.pdf

[sourcery-institute logo]: http://www.sourceryinstitute.org/uploads/4/9/9/6/49967347/sourcery-logo-rgb-hi-rez-1.png

[NASA Langley Research Center]: https://www.nasa.gov/langley

[issues]: https://github.com/sourceryinstitute/FEATS/issues

[download img]: https://img.shields.io/github/downloads/sourceryinstitute/FEATS/total.svg?style=flat-square "Download count badge"
[license img]: https://img.shields.io/badge/license-BSD--3-blue.svg?style=flat-square "BSD-3 License badge"
[release img]: https://img.shields.io/github/release/sourceryinstitute/FEATS.svg?style=flat-square "Latest release badge"
[pdf img]: https://img.shields.io/badge/PDF-README.md-6C2DC7.svg?style=flat-square "Download this readme as a PDF"

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