This repository contains a version of the LUE environmental modelling framework as used in our 2021 manuscript, as well as example scripts and other files used in the preparation of that manuscript. We try to provide all information needed for others to be able to rerun experiments and reproduce results on similar platforms, but it is unlikely that the scripts in this repository will work unchanged. Feel free to contact the corresponding author Kor de Jong in case you have questions.

• De Jong, K., Panja, D., Karssenberg, D., Van Kreveld, M., Scalability and composability of flow accumulation algorithms based on asynchronous many-tasks (submitted for review)

The most recent LUE source code can be found in LUE's own repository.

In the sources, flow accumulation algorithms are named as in the manuscript, but with a postfix of '3'. So accu_threshold is called accu_threshold3. The algorithms we describe are the 3rd version of several trials.

LUE is currently developed and tested on Linux using GCC-9/10. Whenever LUE is changed, it is built for various platforms (combinations of operating systems, versions of 3rd party libraries and tools). For this Github workflows are used that use Github actions. Inspecting the Github workflow scripts can be useful to configure a platform on which LUE can be built. LUE potentially compiles and runs fine on other platforms too, but this is not regularly tested.

Here is an example session of building the version of LUE used for our manuscript:

cd /tmp
# Recursive is used to also checkout submodules
git clone --recurse-submodules https://github.com/computationalgeography/paper_2021_routing
cd paper_2021_routing
conda env create -f environment/configuration/conda_environment.yml
conda activate paper_2021_routing
mkdir build
cd build
cmake \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_TOOLCHAIN_FILE=$PROJECTS/my_devenv/configuration/platform/cmake/login01/Release.cmake \
    -DLUE_BUILD_DATA_MODEL:BOOL=TRUE \
    -DLUE_DATA_MODEL_WITH_PYTHON_API:BOOL=TRUE \
    -DLUE_DATA_MODEL_WITH_UTILITIES:BOOL=TRUE \
    -DLUE_BUILD_HPX:BOOL=TRUE \
    -DLUE_BUILD_FRAMEWORK:BOOL=TRUE \
    -DLUE_DATA_MODEL_WITH_PYTHON_API:BOOL=TRUE \
    -DLUE_FRAMEWORK_WITH_PYTHON_API:BOOL=TRUE \
    -DLUE_HAVE_DOCOPT:BOOL=FALSE \
    -DLUE_HAVE_FMT:BOOL=FALSE \
    -DLUE_HAVE_NLOHMANN_JSON:BOOL=FALSE \
    -DLUE_HAVE_PYBIND11:BOOL=FALSE \
    ../lue
cmake --build . --parallel 10

The mentioned CMake toolchain file contains additional settings specific for the platform we used for running the experiments. It is part of the author's my_devenv repository containing files that are useful in multiple research and development projects.

The LUE framework source code depends on 3rd party libraries and tools, that may or may not be installed already on your system. Dependencies can usually be installed using your system's package manager, using Conan, or using Conda. See the Github workflow scripts for examples of platforms that are guaranteed to work.

Other versions of these packages than the ones mentioned in the Github workflow scripts might also work. HPX is built during the LUE build.

More information about building (the latest version of) LUE can be found in the LUE documentation.

Once LUE is built, executables can be found in build/bin and shared libraries and Python packages in build/lib. On Linux, the software can be used like this:

cd build

# Use a LUE executable
bin/lue_translate --help

# Use the LUE Python package
PYTHONPATH=`pwd`/lib:$PYTHONPATH python -c "import lue; print(lue.__version__)"

Note that LUE is still experimental software. The above has been tested on the platform we performed our experiments on. This does not guarantee that it will work on other platforms, but we expact that LUE can be made to work on other platforms without much effort.

Example sessions. Update as appropriate.

paper_prefix="<prefix_to>/paper_2021_routing"
routing_data="<prefix_to>/data"

export LUE_ROUTING_DATA="$routing_data/routing"
export LUE_OBJECTS="$paper_prefix/build"
export PYTHONPATH="$paper_prefix/build/lib:$PYTHONPATH"

bash "$paper_prefix/source/performance/flow_accumulation.sh"

paper_prefix="<prefix_to>/paper_2021_routing"
routing_data="<prefix_to>/data"

export LUE="$paper_prefix/lue"
export PYTHONPATH="$paper_prefix/build/lib:$PYTHONPATH"

# See usage info of script for meaning of arguments
python $paper_prefix/source/benchmark/array_shapes.py <platform> 0.0 13 150 2 $routing_data/africa/factor2.vrt 23 13 ~/tmp/bounding_boxes

paper_prefix="<prefix_to>/paper_2021_routing"
routing_data="<prefix_to>/data"

export LUE_ROUTING_DATA="$routing_data/routing"
export LUE_BENCHMARK_DATA="$routing_data/benchmark"
export PYTHONPATH="$paper_prefix/build/lib:$PYTHONPATH"

bash "$paper_prefix/source/composability/composability.sh"