LAPACK

LAPACK is a library of Fortran subroutines for solving the most commonly occurring problems in numerical linear algebra.

It is important to note that the BLAS functions included in LAPACK (libblas.so and liblapack.so) are distinct to those within OpenBLAS. Do not try to swap out OpenBLAS with LAPACK, or vice versa.

Building

Some applications or libraries may need a specific version of LAPACK. The guide below shows how to configure and compile a specific version of LAPACK into your own directory: 

#!/bin/bash

LAPACK_DIR=$HOME/lapack

echo "Download Lapack ..."
echo "==================="
wget -q https://github.com/Reference-LAPACK/lapack/archive/refs/tags/v3.12.0.tar.gz -O 3.2.0.tgz

echo ""
echo "Untar ..."
echo "========="
tar -zxf 3.2.0.tgz

echo ""
echo "Load modules ..."
echo "================"
module purge
module load GCC/13.3.0

echo ""
echo "Configure ..."
echo "============="
cd lapack-3.12.0
rm -rf build
mkdir build
cd build
CFLAGS="-O2 -pipe -march=znver5"
cmake .. -DCMAKE_INSTALL_PREFIX=$LAPACK_DIR

echo ""
echo "Compile ..."
echo "==========="
make -j2

echo ""
echo "Install ..."
make install

To compile code using this specific version of LAPACK you will need to point to the files at $HOME/lapack/lib64. Most users will not need to install LAPACK from source, but this quick guide is for those that do.

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