julia_port

This project is an Erlang port driver solution for Erlang - Julia communication.

Prerequisites

• Julia v1.0.0 installation is required.
• Erlang 19 is required. (The build process doesn't work on Erlang/OTP 21.)

Configuration

You need to make sure that the correct libjulia.so is found when julia_port builds its SO file. If you have Julia installed properly and /usr/lib/libjulia.so belongs to your preferred Julia installation, then nothing needs to be done.

Otherwise you can select the appropriate Julia installation by adding it to the LD_LIBRARY_PATH environment variable. The following setting is needed not only for the build but also for the execution, so it might be a good idea to put it in ~/.bashrc. JULIA_INSTALLATION_DIR should point to the Julia installation that you wish to use.

export LIBRARY_PATH=$JULIA_INSTALLATION_DIR/lib:$LIBRARY_PATH
export LD_LIBRARY_PATH=$JULIA_INSTALLATION_DIR/lib:$LD_LIBRARY_PATH

Test

Create libjulia-dev.so that will be used by the automatic tests. This SO file will contain the Julia Base and the Julia functions implemented in test/julia_port_SUITE_data/userimg.jl. See more information at Julia's System Image Building documentation page.

See the related issues 1, 2 for Julia 1.0.0.

Build the SO file with make pre-test:

$ make pre-test

You can use ldd to check that the correct libjulia.so file is found when reading libjulia-dev.so:

$ ldd test/julia_port_SUITE_data/libjulia-dev.so
        ...
        libjulia.so.1 => /usr/lib/libjulia.so.1 (0x00007fa9c344d000)
        ...

Run tests:

$ make test

Shell

• create libjulia-dev.so as described in the Test section

• set julia_lib_path environment variable in sys.config to the created so file's path

• start interactive shell as:

  $ rebar3 shell