dedicated to FortranFan(s)

Creative Commons Attribution 4.0 license

A KISS pure Fortran tests collection to hopefully demystify Fortran myths, but probably do not.

• DEFY is a pure Fortran tests collection aimed to demystify common Fortran myths;
• DEFY is aimed to be a highly reproducible Fortran tests collection;
• DEFY is a toy, but...
• DEFY is aimed to teach good practice;
• DEFY is a Free, Open Source Project.

| Copyrights | Documentation | Install |

The content of this project itself is licensed under the Creative Commons Attribution 4.0 license.

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DEFY collection is organized by means of subdirectories of src home. That is:

→ tree src/
src/
├── abstraction_has_overhead
│   ├── abstract_ood_1
│   │   ├── defy.f90
│   │   ├── README.md
│   │   ├── run_gnu_optimized.sh
│   │   ├── run_gnu.sh
│   │   ├── run_intel_optimized.sh
│   │   └── run_intel.sh
│   └── README.md
├── goto_is_fastest
│   ├── goto_if_select_comparison_1
│   │   ├── defy.f90
│   │   ├── README.md
│   │   ├── run_gnu_optimized.sh
│   │   ├── run_gnu.sh
│   │   ├── run_intel_optimized.sh
│   │   └── run_intel.sh
│   ├── goto_if_select_comparison_2
│   │   ├── defy.f90
│   │   ├── i.f90
│   │   ├── README.md
│   │   ├── run_gnu_optimized.sh
│   │   ├── run_gnu.sh
│   │   ├── run_intel_optimized.sh
│   │   └── run_intel.sh
│   └── README.md
└── powers_naive_definitions_have_overhead
    ├── powers_1
    │   ├── defy.f90
    │   ├── README.md
    │   ├── run_gnu_optimized.sh
    │   ├── run_gnu.sh
    │   ├── run_intel_optimized.sh
    │   └── run_intel.sh
    └── README.md
...

where

• src/#myth is the home of each myth, e.g. src/goto_is_fastest;
  • each src/#myth/ contains:
    • src/#myth/README.md describes the myth and the testing suite;
    • one or more subdirectories containing the actual test(s) where there are:
      • a README.md describing the test;
      • a defy.f90 (or .F90 is pre-processor directives are used) Fortran file containing the actual test;
      • one or more bash scripts to run the test, e.g. run_gnu.sh to run the test with GNU gfortan without optimizations.

Currently DEFY collection includes:

• abstraction has overhead:
  • abstract OOD 1:
• array syntax has overhead:
  • array resize 1:
• defined operators have overhead:
  • defined operators 1:
• goto is fastest:
  • goto if select comparison 1;
  • goto if select comparison 2;
  • goto if select comparison 3;
  • goto if select comparison 4;
  • goto if select comparison 5;
  • goto if select comparison 6;
  • goto if block comparison 1;
• powers naive definitions have overhead:
  • powers 1:
• any new myth is more than welcome, feel free to open a new issue or create a pull request.

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To be written.

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