Clone the repository, enter the folder and say make. A plot should appear showing the execution time for 1 thread and for 2 threads. If things don't work consider following some of the instructions below.
Starting on a fresh Ubuntu 12.04.
Install essential tools:
sudo apt-get install build-essential subversion git cmake
Install Python if you want (try without, it should not be needed):
sudo apt-get install python-numpy python-scipy python-matplotlib ipython ipython-notebook
Install OpenBLAS using the package manager:
sudo apt-get install libopenblas-dev
Install gnuplot and htop:
sudo apt-get install gnuplot htop
View the topology of the system:
sudo apt-get install hwloc
lstopo
How many processors are there? How many hyperthreads?
Download Armadillo:
wget http://sourceforge.net/projects/arma/files/armadillo-4.100.2.tar.gz
tar xvf armadillo-4.100.2.tar.gz
Install Armadillo required packages:
sudo apt-get install cmake libopenblas-dev liblapack-dev libarpack2-dev
Run cmake . in armadillo folder. Armadillo does not find OpenBLAS
sudo ln -s /usr/lib/openblas-base/libopenblas.so /usr/lib/libopenblas.so
now Armadillo finds OpenBLAS.
Build armadillo:
cmake .
make
sudo make install
Enter exampes folder and build and run tests:
make
./example1
./example2
# for some reason Armadillo installed itself in /usr/local/lib
LD_LIBRARY_PATH=/usr/local/lib ./example1
LD_LIBRARY_PATH=/usr/local/lib ./example2
If all of this works it should be possible to go back to the start and run the program.