Legacy computational fluid dynamics (CFD) software plays a crucial role in today’s simulation-based engineering due to the confidence level established through validation of these codes over time. Fortran, one of the oldest programming languages around, has gained an important role in high performance computing (HPC) environment as the complexity of the problems tackled increased with their siz...

The latest version of the Fortran standard, Fortran 2003, introduces many new features. While full compilers are not yet available, many have now implemented one of the most important new features, a portable method for Fortran to interoperate with C. This allows access from Fortran to many features of the OS that were previously the domain of the systems programmer. In this report I show how s...

notion of “computable” — i.e., to isolate the general structure of the computing process itself. The danger we face is that the various types of computability, as defined here, will say more about the individual languages that gave rise to them than they do about this general structure. But anyone who is familiar two or more languages will realize that this difficulty is more one of principle t...

Fortran and C++ are the dominant programming languages used in scientific computation. C,onsequently, extensions to these languages are the most popular for programming massively parallel computers. We discuss two such approaches to parallel Fortran and one approach to C++. The High Performance Fortran Forum has designed HPF with the intent of supporting data parallelism on Fortran 90 applicati...

We introduce “Hybrid Fortran”, a new approach that allows a high performance GPGPU port for structured grid Fortran codes. Œis technique only requires minimal changes for a CPU targeted codebase, which is a signi€cant advancement in terms of productivity. It has been successfully applied to both dynamical core and physical processes of ASUCA, a Japanese mesoscale weather prediction model with m...