FortranCon 2021

Most, if not all, programs that perform numerical computations of some kind or other need to deal with
the units of measure in which their variables are expressed. Many solutions for the general problem
have been proposed, but the problem is more difficult than it looks at first sight. For instance,
should a program be able to handle different units (cm versus inch) automatically? Is it...

Compile-time evaluation offers significant advantages during optimization and debugging. It promotes transparency and brings a code closer to functional paradigm. Unfortunately, Fortran does not support compile time evaluation of user defined functions. Nevertheless, it includes two features which salvage such undertakings: a vast library of intrinsic functions and default constructors. The...

Practitioners in the field of hydrometallurgy need computational models that
help to plan, optimize and troubleshoot the operation. Most of these models are
mass balance based and can be simply formulated in a spreadsheet application.
However, more detailed models that deal with such processes as heap or dump
leaching require solution of numerous coupled partial differential...

In this talk, I will present my personal experience in developing packages for molecular dynamics simulations in Fortran and in Julia, in particular codes for the calculation of many-body interactions. I will discuss what are the advantages, facilities, and disadvantages of the Julia language and its set of development tools, compared to the current Fortran development process.The main...

I will present an overview of the methods we use to generate bit-reproducible
solutions of the Modular Ocean Model (MOM), a Fortran-based model widely used
in weather and climate simulations. I will briefly describe the overall
structure of the solvers as well as its verification and regression test
suites. This is followed by a discussion of the more novel testing methods...

This talk will describe our experience porting the bottleneck kernels of NWChem's CCSD(T) code. With the NVIDIA HPC Fortran compiler, we are able to run completely standard Fortran code on A100 GPUs, with respectable performance, relative to the expert-optimized GPU implementation based on CUTENSOR. The same code runs well on a range of CPUs. We will explain how to optimize DO CONCURRENT...

Although Fortran has evolved into a modern, multi-paradigm programming language, the research literature on Fortran more thoroughly addresses some paradigms, such as object-oriented and parallel programming, than others, such as functional programming and programming by contract. This talk will present new patterns for expressing concepts from these less-studied paradigms and will illuminate...

Over the last decade, efficient and portable GPU programming has become a necessary evil for applications expecting to run efficiently on modern supercomputers.
The Heterogeneous-compute Interface for Portability (HIP) is a C++ Runtime API and kernel language that allows developers to create portable applications for AMD and NVIDIA GPUs from single source code.
HIPFort exposes the HIP APIs...

The SPACE (System Power Analysis for Capability Evaluation) Fortran program developed at NASA Glenn Research Center has enabled power generation predictions and energy balance analyses for spacecraft electrical power systems (EPS) since 1988. SPACE was originally designed to analyze the EPS of the Space Station Freedom and continues to support certifications for visiting vehicles and...

In this presentation the implementation adopted on existing Fortran code used across different platforms (Windows/Linux), for the calculation of Ship motions based on potential theory, to achieve hybrid parallelization (MPI and OMP) will be discussed. Main points of attention when developing code (MPI shared memory, OMP private data, sp/dp precision, compilers, etc.) as well as user definition...

f2py is the gold standard for interfacing Fortran and Python. The most famous downstream consumer of the generated wrappers is undoubtedly the scipy ecosystem. Crucially, f2py is not a compiler, and generates a best effort set of wrappers, aided by special comment lines. One of the key inter-operable approaches to compilation of the subsequent wrappers relies on numpy.distutils. Given...

In the modern software development approach, it is often advocated that test automation should be implemented in the regular workflow. The test automation aims to simplify the software development by replacing the repetitive tasks into a framework that would compare the actual with the predicted outcomes.

One way to guarantee that new implementations in legacy code would not change past...

Starting in Fortran 2008, Fortran supports two forms of parallelism: loop-level parallelism using DO CONCURRENT and coarse-grain parallelism using
coarrays, which is form of PGAS. This talk will describe a third form of parallelism and argue that it should be supported by the Fortran language. The third form of parallelism is shared-memory task parallelism, which supports a range of use...

Automated testing is a well established best practice in software development, so you are writing test suites for your Fortran projects right? But how useful is your test suite after you have finished writing it? Does it help you to pinpoint the source of bugs? Does it help you to make changes to functionality, or get in the way? Would a new developer find it useful for getting their bearings...

A new community of developers has formed to unite Fortran users and modernize the Fortran ecosystem.
In this presentation, we describe the high-level features of Fortran that continue to make it a good choice for scientists and engineers in the 21st century. We also outline ongoing community efforts including the development of a Fortran standard library and package manager, the fostering of...

LFortran has a Bison based parser implemented in the parser.yy file that can parse most of Fortran source code. The main objective of my GSoC project was to make sure that all the grammar rules defined are exposed to AST (Abstract Syntax Tree) level i.e., one has to systematically go over the parser file and make sure AST is always generated for all the grammar rules defined, resulting in...

In my Google Summer of Code, 2021 with LFortran under the umbrella of NumFOCUS, I worked on adding semantic and LLVM backend support for arrays and allocatables as per Fortran standards. Specifically, the project resulted in addition of support for array declaration, operations on arrays (slicing, unary and binary operations), allocatable arrays, automatic deallocation,...

The Fortran standard is a rather imposing document; though with F2018 at around 600 pages it is significantly lighter than its C++ counterpart. The standard itself is rarely cited as a beginner resource, with a cottage industry of books designed to shed light on the dry prose and foreboding technical rigor. However, with LFortran, particularly viewed through the lens of the Abstract Semantic...

The Fortran standard library (stdlib) is now well into its second year of development. In this past year, stdlib has grown not only in its functionality but in its contributor base, with most of the new development coming from new contributors, including two Google Summer of Code students. Stdlib provides new functionality for working with bit sets, logging, quadrature, sorting, strings, and...

To provide better support for strings, the Fortran Standard Library (stdlib) introduces stdlib_string_type, stdlib_strings and stdlib_stringlist module.

Since the start of the project, several string inquiry and manipulation procedures like pad, find, replace-all, etc have been added, adhering to the philosophy of unifying the community and providing simple and intuitive...

The Fortran-lang stdlib was introduced to provide extensive support to Fortran developers by providing modules that can be directly used in their programs. A linked list is one of the classical data structures that has numerous applications.
Example:
- It can be used as a self-growing container.
- It can store linearly dependent data. (web history, slides in some presentation, etc)
- Acts...

A language-specific package manager is an important element to build an efficient ecosystem of libraries and projects. Fortran has long missed a dedicated package manager, making the user experience of practitioners cumbersome. With the Fortran package manager (fpm) we are addressing these needs creating a reliable and productive tool that makes building applications and using libraries...

The Fortran Package Manager (fpm) aims to be a Fortran-specific build system to simplify compiling Fortran code and using third-party dependencies.
Fpm is currently in alpha development status and supports a wide range of features.
Recent work, undertaken as part of the Google Summer of Code programme, has implemented the syntax and logic required to provide fine-grain control of compiler...