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FortranTip @fortrantip.bsky.social · 27/05/2025

DO CONCURRENT communicates that an operation should be independent of order, but when there is no parallelization method the compiler must pick some order to follow. Marshall Ward ran some tests and suggests outer to inner loops. github.com/marshallward...

github.com

GitHub - marshallward/do-conc-order: Comparison of non-parallel do concurrent(i,j) vs do concurrent(j,i)

Comparison of non-parallel do concurrent(i,j) vs do concurrent(j,i) - marshallward/do-conc-order

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FortranTip @fortrantip.bsky.social · 11/05/2025

www.sovereign.tech/tech/gfortran The Sovereign Tech Fund is funding gfortran €360,000 to improve parallel computing support and make other improvements. It is used in climate modeling, aerospace, weather forecasting, computational chemistry, artificial intelligence, and other fields.

sovereign.tech

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FortranTip @fortrantip.bsky.social · 04/05/2025

github.com/fortran-lang... Fprettify, written in Python, is probably the most used auto-formatter for modern Fortran code. It imposes strict whitespace formatting and integrates with editors such as Vim.

github.com

GitHub - fortran-lang/fprettify: auto-formatter for modern fortran source code

auto-formatter for modern fortran source code. Contribute to fortran-lang/fprettify development by creating an account on GitHub.

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FortranTip @fortrantip.bsky.social · 27/04/2025

fortran-lang.discourse.group/t/gnu-fortra... Gfortran 15.1 is released. Fortran 2018 and 2023 locality specifiers to DO CONCURRENT are now supported, there is experimental support for unsigned types, and a -Wexternal-interface-mismatch option has been added, among other things.

fortran-lang.discourse.group

GNU Fortran 15.1 has been released

Greetings, the GCC developers announced the release of GCC 15.1. The change log mentions the following updates to GNU Fortran: Fortran 2018 and 2023 locality specifiers to do concurrent are now sup...

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FortranTip @fortrantip.bsky.social · 26/04/2025

There are efforts to translate Fortran to C++ with LLMs, but Damian Rouson notes that Fortran concepts such as pure functions and SPMD parallelism with a PGAS that both work in distributed memory have no precise counterparts in C++. fortran-lang.discourse.group/t/scientists...

fortran-lang.discourse.group

Scientists are using artificial intelligence and large language models to rewrite old code in modern languages

I see several issues with translating Fortran to C++. The most fundamental is that Fortran has concepts and capabilities that C++ lacks (of course, the reverse is true too). A significant example is...

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FortranTip @fortrantip.bsky.social · 21/04/2025

Vincent Lafage discusses the evolution of Fortran and how to evolve legacy Fortran codes in a video at youtube.com/watch?v=iXod..., starting at 8:47.

youtube.com

Webinar - Fortran on CPU and GPU

YouTube video by LAPP CNRS

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FortranTip @fortrantip.bsky.social · 18/04/2025

github.com/Beliavsky/Ge... I wrote Python scripts that prompt LLMs to generate Fortran code and send them compiler error messages until the code compiles. On Groq Cloud, Facebook's llama-3.3-70b-versatile is a good coding model.

github.com

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FortranTip @fortrantip.bsky.social · 29/03/2025

If x is an allocatable array, x = y causes the compiler to check if x must be resized before y is copied to it. You can write x(:) = y to bypass the compiler check and perhaps boost speed, but this should be tested. fortran-lang.discourse.group/t/optimizing...

fortran-lang.discourse.group

Optimizing vectorized array operations

There are lots of really good answers here! So I won’t add to those. Let me just add a final note which makes array-syntax sub-optimal, and in this suggestion, it can kill performance. When you do ...

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FortranTip @fortrantip.bsky.social · 28/03/2025

Gfortran has a DEPRECATED attribute and ifx has a MESSAGE directive to warn about procedures that should not be called in new code but must be preserved for backwards compatibility. fortran-lang.discourse.group/t/what-are-t...

fortran-lang.discourse.group

What are the versioning/dev rules of stdlib?

GCC offers a deprecated attribute: module a contains subroutine foo !GCC$ ATTRIBUTES DEPRECATED :: FOO print *, "Don't call me." end subroutine end module use a, only: foo call foo end that shows a...

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FortranTip @fortrantip.bsky.social · 17/03/2025

github.com/guntherwille... "When reading a file, line by line, and using a character array with fixed length (len attribute) to store it, trailing spaces will be added to fill the character string." To avoid this, in the READ statement use advance="no", set the size, and reallocate.

github.com

GitHub - guntherwillems/fortran-file-read: Fortran, read a text file without losing trailing spaces

Fortran, read a text file without losing trailing spaces - guntherwillems/fortran-file-read

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FortranTip @fortrantip.bsky.social · 16/03/2025

fortran-lang.discourse.group/t/first-time... Jean-Christophe Loiseau gives a set of numerical algorithms to code to learn a scientific programming language such as Fortran. His book loiseaujc.github.io/Scientific_C... uses NumPy and SciPy.

fortran-lang.discourse.group

First time fortran-lang programmer : advice for a newbie?

An excellent resource for beginners is the book Modern Fortran: Building efficient parallel applications by @milancurcic, particularly if you’re interested in using Fortran for scientific computing ap...

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FortranTip @fortrantip.bsky.social · 07/03/2025

github.com/fortuno-repo... Fortuno is a flexible & extensible object-oriented Fortran unit testing framework for serial, MPI-parallel and coarray-parallel projects that minimizes boilerplate code when writing tests while prioritizing modularity and extensibility.

github.com

GitHub - fortuno-repos/fortuno: Flexible & extensible object oriented Fortran unit testing framework for serial, MPI-parallel and coarray-parallel projects

Flexible & extensible object oriented Fortran unit testing framework for serial, MPI-parallel and coarray-parallel projects - fortuno-repos/fortuno

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FortranTip @fortrantip.bsky.social · 06/03/2025

beliavsky.github.io/Fortran-pack... Here are 400 projects that work with the Fortran Package Manager, listed by topic. FPM lets you build a program/library, run the executables/tests, and distribute it as a dependency to other projects.

beliavsky.github.io

Projects that can be built with the Fortran Package Manager. Also see fortran-lang package index. Please suggest changes here.

List of projects that can be built with the Fortran Package Manager

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FortranTip @fortrantip.bsky.social · 01/03/2025

github.com/Beliavsky/Fo... Many books with Fortran code have been published in the fields of numerical analysis, mathematical optimization, CFD, finite elements, physics, chemistry, and statistics. They are listed by subject at the repo.

github.com

GitHub - Beliavsky/Fortran-related-books: Books with Fortran code, other than textbooks, listed by subject

Books with Fortran code, other than textbooks, listed by subject - Beliavsky/Fortran-related-books

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FortranTip @fortrantip.bsky.social · 24/02/2025

fortran-lang.org/learn/oop_fe... Fortran-lang just added an article "Putting Fortran’s object-related features to practical use" by Reinhold Bader, revised by nbehrnd, covering object-based and object-oriented programming techniques and performance and ease of use.

fortran-lang.org

Putting Fortran’s object-related features to practical use — Fortran Programming Language

Fortran : High-performance parallel programming language

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