ScaLAPACK : Scalable Linear Algebra PACKage

ScaLAPACK is a library of high-performance linear algebra routines for parallel distributed memory machines provided by Univ. of Tennessee; Univ. of California, Berkeley; Univ. of Colorado Denver; and NAG Ltd.. ScaLAPACK solves dense and banded linear systems, least squares problems, eigenvalue problems, and singular value problems. The library is currently written in Fortran (with the exception of a few symmetric eigenproblem auxiliary routines written in C).