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slides_software_dev_2.lyx
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#LyX 2.3 created this file. For more info see http://www.lyx.org/
\lyxformat 544
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\begin_layout Title
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More thoughts on scientific code development
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\begin_layout Author
Christopher Albert
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Lessons learned last time
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Non-standard tools for production use have disadvantages
\end_layout
\begin_deeper
\begin_layout Itemize
High maintainance effort
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Devs and users need to learn custom system
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\begin_layout Itemize
Less interoperable with existing codes
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New strategy with standard tools
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\begin_layout Itemize
Compile time dispatch using CMake config variables
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Runtime dispatch using Fortran interface blocks
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Can still avoid runtime linking of shared libraries
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\end_deeper
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Result: Modular, simple F95 code that is
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\begin_deeper
\begin_layout Itemize
Easy to read and extend
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Highly optimizable by compiler
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Can be interfaced easily (f2py, fffi, Matlab, C, Julia, R, ...)
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The beauty of Fortran
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Variable declaration at beginning pushes you to write small routines
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\begin_inset Quotes eld
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USE
\begin_inset Quotes erd
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statement can be made at innermost scope
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Stateless (like REST) architecture possible even with global subroutines
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\begin_deeper
\begin_layout Itemize
However, writing module variables from global subroutines is discouraged
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\begin_layout Itemize
In that case, better include routines with module that they modify
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Or, even better, use typed structs as explicit arguments
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Compile time configuration with CMake
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From NEO-RT/VER_2/SRC/CMakeLists.txt :
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lstparams "basicstyle={\footnotesize},frame=single"
inline false
status open
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message(STATUS "CMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}")
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message(STATUS "ORBIT_MODE=${ORBIT_MODE}")
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message(STATUS
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"-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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List config using 'cmake -L .'
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and change using 'cmake -DVAR_NAME=VALUE .'
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or edit CMakeCache.txt
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-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --"
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)
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if (ORBIT_MODE STREQUAL full)
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target_sources(neo-rt.x PRIVATE orbit_full.f90 transport_full.f90)
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add_subdirectory(../../POTATO/VER_3/SRC potato)
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endif()
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Here POTATO/VER_3/SRC/ contains its own CMakeLists.txt with source list.
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\begin_layout Foilhead
What else has revolutionized work last week
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\begin_layout Itemize
https://www.mathcha.io/ for writing and drawing online with
\emph on
LaTeX
\emph default
and
\emph on
TikZ
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(like online
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LyX
\emph default
)
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\begin_layout Itemize
https://www.sphinx-doc.org/ together with
\emph on
sphinx-fortran
\emph default
and
\emph on
sphinx-math-dollar
\emph default
for docs
\end_layout
\begin_deeper
\begin_layout Itemize
...
or Doxygen, or combination of two
\end_layout
\end_deeper
\begin_layout Itemize
WSL2 for running Linux inside Windows
\end_layout
\begin_layout Itemize
Visual Studio Code + Modern Fortran + Fortran IntelliSense, with WSL2 integratio
n
\end_layout
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\begin_inset Separator plain
\end_inset
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\end_body
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