I was a bit surprised to find that there's no ATLAS in the standard Arch repositories (it is in AUR though), so here's how to build some of the more common math libraries for yourself:
ATLAS
pacman -S wget base-devel gcc-fortran cpupower sudo systemctl enable cpupower
To build ATLAS you should set the governor for your CPU to performance to get the best optimization:
cpupower frequency-set -g performance sudo cp /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
Basically copy the scaling_governor to all cpus (cpu0, cpu1, cpu2 ...) as shown in the last line above. When you set the governor back to e.g. ondemand, follow the same steps.
sudo mkdir /opt/ATLAS
chown ${USER} /opt/ATLAS
mkdir -p ~/tmp/atlas
cd ~/tmp/atlas
wget http://www.netlib.org/lapack/lapack-3.4.2.tgz
wget http://downloads.sourceforge.net/project/math-atlas/Stable/3.10.1/atlas3.10.1.tar.bz2
tar xvf atlas3.10.1.tar.bz2
mkdir build/
cd build/
../ATLAS/./configure --prefix=/opt/ATLAS -Fa alg '-fPIC' --with-netlib-lapack-tarfile=$HOME/tmp/atlas/lapack-3.4.2.tgz --shared
make
make install
Simple as that. You can now change the governor back
cpupower frequency-set -g ondemand sudo cp /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor sudo cp /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor ...
netlib BLAS and lapack
pacman -S wget base-devel gcc-fortran cmake sudo mkdir /opt/netlib sudo chown $USER /opt/netlib mkdir /opt/netlib/blas/lib -p mkdir -p ~/tmp/blas cd ~/tmp/blas wget http://www.netlib.org/blas/blas.tgz tar xvf blas.tgz cd BLAS/
Edit make.inc
OPTS = -O3 -shared -m64 -march=native -fPIC
make all gfortran -shared -Wl,-soname,libnetblas.so -o libblas.so.1.0.1 *.o -lc ln -s libblas.so.1.0.1 libnetblas.so cp lib*blas* /opt/netlib/blas/lib cd ../ wget http://www.netlib.org/lapack/lapack-3.4.2.tgz tar xvf lapack-3.4.2.tgz mkdir /opt/netlib/lapack mkdir build/ cd build/ ccmake ../lapack-3.4.2/ -DCMAKE_INSTALL_PREFIX=/opt/netlib/lapack -DBUILD_SHARED_LIBS=ON -DUSE_OPTIMIZED_BLAS=ON
Hit c twice to configure, then g to generate.
Edit CMakeCache.txt and add the following lines at the beginning:
######################## # EXTERNAL cache entries ######################## BLAS_FOUND:STRING=TRUE BLAS_GENERIC_FOUND:BOOL=TRUE BLAS_GENERIC_blas_LIBRARY:FILEPATH=/opt/netlib/blas/lib/libnetblas.so BLAS_LIBRARIES:PATH=/opt/netlib/blas/lib/libnetblas.so
Do
ccmake ../lapack-3.4.2/
again, then hit c once, then g.
Next,
make make install
Done.
Openblas
Copied from here: http://verahill.blogspot.com.au/2013/02/334-compiling-nwchem-with-openmpi-and.html
Download from http://github.com/xianyi/OpenBLAS/tarball/v0.1.1
pacman -S wget base-devel gcc-fortran sudo mkdir /opt/openblas sudo chown $USER /opt/openblas tar xvf xianyi-OpenBLAS-v0.1.1-0-g5b7f443.tar.gz cd xianyi-OpenBLAS-e6e87a2/ make all BINARY=64 CC=/usr/bin/gcc FC=/usr/bin/gfortran USE_THREAD=0 INTERFACE64=1 1> make.log 2>make.err make PREFIX=/opt/openblas install cp lib*.* /opt/openblas/lib
