ITSOL v. 2.0:   ITERATIVE SOLVERS package

This version dated : Tue Nov 16 15:50:54 CST 2010

---

ITSOL is a library of iterative solvers for general sparse linear systems of equations. ITSOL can be viewed as an extension of the itsol module in SPARSKIT. It is written in C and offers a selection of recently developed preconditioners. The preconditioner suite includes: ILUK (ILU preconditioner with level of fill) ILUT (ILU preconditioner with threshold) ILUC (Crout version of ILUT) VBILUK (variable block preconditioner with level of fill - with automatic block detection) VBILUT (variable block preconditioner with threshold - with automatic block detection) ARMS (Algebraic Recursive Multilevel Solvers -- includes actually several methods - In particular the standard ARMS and the ddPQ version which uses nonsymmetric permutations). Note that ITSOL is a scalar package. You may find parallel implentations of some of the preconditioners listed above in pARMS .

---

Software

• First read the Copyright agreement
• Download ITSOL - gzipped tar file (ITSOL_2.tar.gz)
  VERSION 2.0
  
• Download ZITSOL - (complex solvers)- Gzipped tar file (ZITSOL_1.tar.gz)
  VERSION: 1.0

Authors

• Na Li [graduate student, 2001 - 2006] -- developed crout ILUT, C versions of ILUK, ILUT, and the VBILU codes, many other things.
• Brian Suchomel [post-doc 1997-1999] -- developed initial version of ARMS
• Daniel Osei-Kuffuor (current) [complex version ZITSOL]
• Ruipeng Li (current)
• Yousef Saad [The new ARMS - nonsymmetric permutations - vbilu methods, fgmres, final packaging of itsol, ...]
  
• This package also benefited from help from various other co-workers over the years - who are/ were involved with SPARSKIT, pARMS, PSPARSLIB, and other projects:
  Edmond Chow, Masha Sosonkina, Matthias Bollhoefer, Zhongze Li, Kesheng Wu, Leigh Little, Laurent Smoch, and others.

Publications

• Technical reports related to itsol

Contact

• Yousef Saad, saad AT cs dot umn dot edu