Installation and Building

Downloading the Source

\(\texttt{NNCAlib}\) is distributed using the git version control system, and is hosted on Github. The repository can be cloned using:

git clone https://github.com/SAFRAN-LAB/NNCA.git --recursive

The --recursive flag is argument to ensure that all submodules are also checked out.

Dependencies

• Eigen Linear Algebra Library (get it here)

• (optional) An OpenMP enabled compiler (e.g. gcc4.2 or above) is required to use shared-memory parallelism.

NOTE: On MacOS, the default compiler is clang which doesn’t have OpenMP support. You will have to use g++ to make use of the speedups from OpenMP:

user@computer NNCA$ brew install g++-13

Installation

Set the environment variable EIGEN_PATH to the location of your Eigen installation. This is needed by the make files.:

user@computer NNCA$ export EIGEN_PATH=path/to/eigen/

Testing

Now, we need to ensure that the installation is proper and if the dependencies are recognised. For this purpose, we will be running the script NNCA2D/testFMM2D.cpp. Run NNCA2D/Makefile2D.mk to get your executable. To check this on your computer, run the following lines:

user@computer NNCA$ cd NNCA2D
user@computer NNCA2D$ make -f Makefile2D.mk clean
user@computer NNCA2D$ make -f Makefile2D.mk
user@computer NNCA2D$ ./testFMM2D 5 6 1 5 1