This is an optional compilation step in addition to Installation of the Python3 bindings which makes the code as fast as the original ecCodes module.
Step-by-step guide
To test the much faster CFFI API level, out-of-line mode you need the ecCodes header files. Then you need to clone the repo in the same folder as your ecCodes source tree, make a pip development install and custom compile the binary bindings following these steps:
# Clone te repository to the same folder of your ecCodes source tree: $ git clone https://github.com/ecmwf/eccodes-python $ cd eccodes-python # Make a pip development install: $ pip install -e . # Copy ecCodes header files from ecCodes installation to Python3 include directory: $ cp {ECCODES_DIR}/include/*.h {PYTHON3_DIR}/include/python3.{X}/ # Compile the binary bindings: $ python3 builder.py