Tarantella needs to be built from source. Since Tarantella is built on top of TensorFlow 2, you will require a recent version of it. Additionally, you will need an installation of the open-source communication library GPI-2, which Tarantella uses to communicate between processes. Lastly, you will need pybind11, which is required for Python and C++ inter-communication.

In the following we will look at the required steps in detail.

Installing dependencies

Compiler and build system

Tarantella can be built using a recent gcc compiler (from version 7.4.0). You will also need the build tool CMake (from version 3.8).

Installing GPI-2

Next, you will need to download, compile and install the GPI-2 library. The currently supported version is v1.4.0, which needs to be built with position independent flags (-fPIC).

To download the required version, clone the git repository and checkout the correct tag:

git clone
cd GPI-2
git fetch --tags
git checkout -b v1.4.0 v1.4.0

Now, use autotools to configure and compile the code

export GPI2_INSTALLATION_PATH=/your/installation/path
CFLAGS="-fPIC" CPPFLAGS="-fPIC" ./configure --with-ethernet --prefix=${GPI2_INSTALLATION_PATH}

where ${GPI2_INSTALLATION_PATH} needs to be replaced with the path where you want to install GPI-2. Note the --with-ethernet option, which will use standard TCP sockets for communication. This is the correct option for laptops and workstations.

In case you want to use Infiniband, replace the above option with --with-infiniband. Now you are ready to install GPI-2 with

make install

where the last two commands make the library visible to your system. If required, GPI-2 can be removed from the target directory by using make uninstall.

Installing TensorFlow 2

Next you will need to install TensorFlow 2. Tarantella supports TensorFlow versions 2.0 to 2.2. Either version can be installed in a conda environment using pip, as recommended on the TensorFlow website.

In order to do that, first install conda on your system. Then, create and activate an environment for Tarantella:

conda create -n tarantella
conda activate tarantella

Now, you can install the latest supported TensorFlow version with

conda install python=3.8
pip install --upgrade tensorflow==2.2

Tarantella requires at least Python 3.7. Make sure the selected version also matches the TensorFlow requirements.

Installing pybind11

The last dependency you will need to install is pybind11, which is available through pip and conda. We recommend installing pybind11 via conda:

conda install pybind11 -c conda-forge

SSH key-based authentication

In order to use Tarantella on a cluster, make sure you can ssh between nodes without password. For details, refer to the FAQ section. In particular, to test Tarantella on your local machine, make sure you can ssh to localhost without password.

Building Tarantella from source

With all dependencies installed, we can now download, configure and compile Tarantella. To download the source code, simply clone the GitHub repository:

git clone

Next, we need to configure the build system using CMake. For a standard out-of-source build, we create a separate build folder and run cmake in it:

cd tarantella
mkdir build && cd build
export TARANTELLA_INSTALLATION_PATH=/your/installation/path

This will configure your installation to use Ethernet as the underlying communication interconnect. To install Tarantella on a cluster equipped with Infiniband capabilities, follow the guidelines in the next section.

Now, we can compile and install Tarantella to TARANTELLA_INSTALLATION_PATH:

make install

[Optional] Building Tarantella with Infiniband support

To install Tarantella with Infiniband communication backend, first download the code as in the previous section:

git clone

Make sure that GPI-2 is installed with Infiniband support as shown here. Then, configure Tarantella using CMake in a separate build directory:

cd tarantella
mkdir build && cd build
export TARANTELLA_INSTALLATION_PATH=/your/installation/path

Finally, compile and install Tarantella as usual:

make install

[Optional] Building and running tests

In order to build Tarantella with tests, you will also need to install Boost (for C++ tests), and pytest (for Python tests).

To install boost with the required devel-packages, under Ubuntu you can use

sudo apt install libboost-all-dev

while in Fedora you can use

sudo dnf install boost boost-devel

To install pytest you can use pip:

pip install -U pytest

After having installed these libraries, make sure to configure Tarantella with testing switched on:

cd tarantella
mkdir build && cd build

Now you can compile Tarantella and run its tests in the build directory.


[Optional] Building documentation

If you would like to build the documentation locally, run the following cmake command


before compiling. This requires you to have Sphinx installed:

pip install -U sphinx