
1. general contains a few  test drivers to solve a
distributed sparse linear  system using preconditioned  FGMRES. 

2. grid contains test drivers related  to simple 2-D and
3-D centered finite difference  elliptic PDEs on rectangular  domains.  

3. petsc contains a test driver to solve a linear system with PETSc. The
   preconditioners in pARMS can be used as add-ons to PETSc.

4. tests contains some testing programs to verify the correctness of
   some functions in pARMS.

5. matrices contains some matrices stored in HB format.