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pARMS is a library of parallel solvers for distributed sparse linear systems of
equations. It is based on a preconditioned Krylov subspace approach, using a
domain decomposition viewpoint. The plural in "Solvers" is due to the fact that
pARMS offers a large selection of preconditioners for distributed sparse linear
systems and a few of the best known accelerators.

The basic methodology used relies on a Recursive Multi-level ILU factorization
wich allows to develop many of the standard domain-decomposition type iterative
solvers in a single framework. For example, the standard Schwarz procedures are
included as are a number of Schur complement techniques.

pARMS resulted from a team effort that spanned several years. It really began in
around 1993/1994 with the development of its FORTRAN predecessor called
PSPARSLIB [developer: Y. Saad]. In 1999-2000 Brian Suchomel developed the
sequential version of ARMS. Zhongze Li developed the first version of the
parallel ARMS in around 2000-2001. The current version of pARMS is the result of
a substantial revision of this earlier code done in part by YS and to a bigger
extent by Masha Sosonkina. Many people made other contributions to pARMS.

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