SPOOLES is a library for solving sparse real and complex linear
systems of equations, written in the C language using object oriented
design. At present, there is the following functionality:
1. Compute multiple minimum degree, generalized nested dissection and
multisection orderings of matrices with symmetric structure.
2. Factor and solve square linear systems of equations with symmetric
structure, with or without pivoting for stability. The
factorization can be symmetric LDLT, Hermitian LDLH, or
nonsymmetric LDU. A direct factorization or a drop tolerance
factorization can be computed. The factors and solve can be done
in serial mode, multithreaded with Solaris or POSIX threads, or
with MPI.
3. Factor and solve overdetermined full rank systems of equations
using a multifrontal QR factorization, in serial or using POSIX
threads.
4. Solve square linear systems using a variety of Krylov iterative
methods. The preconditioner is a drop tolerance factorization,
with or without pivoting for stability.
WWW: http://www.netlib.org/linalg/spooles/spooles.2.2.html