336. Compiling ATLAS, netblas, lapack and openblas on Arch Linux

Here's another Arch post.

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