Overview of JTpack90

• Descendent of JTpack77
• Primary support is for preconditioned Krylov subspace methods.
  • Conjugate gradients (CG)
  • Generalized Minimal Residuals (GMRES)
  • Biconjugate Gradients Squared (BCGS)
  • Transpose-Free Quasi-minimal Residuals (TFQMR)
  • Bi-CGSTAB
  • etc
• Support for a variety of preconditioners (m-step Jacobi, m-step SSOR, ILU, etc).
• Support for a variety of coefficient storage formats
• Variety of usage modes:
  • as a ``black box''
  • as a toolkit for algorithm development
  • as an exploratory tool (via the GUI)
• GUI (Tcl/Tk), which provides:
  • automated building of library and test code,
  • intuitive introduction to package capabilities, and
  • analysis of test problems or systems dumped from a host code.
    • view matrix structure
    • view eigenspectrum

 
• JTpack90 Attributes
• JTpack90 Design
• ELL ``Class'' Module
• CG Module
• Matrix-Free Implementation