petsc-3.4.2 2013-07-02

# Documentation: Changes: 2.1.2

## CHANGES in PETSc 2.1.2

#### General:

- Win32fe now takes --nt4 option for compatibility on NT4
- Supports cygwinpaths in win32fe
- Better support for borland tools
- Added PetscOptionsInsertString()
- Allow full path of debugger to be specified using -start_in_debugger option
- Better hyperlinks across documentation (including users manual)

#### ADIC:

- Support for global reductions on local functions
- Allow coloring of periodic grids

#### AO (Application Orderings):

#### TS (Timestepping Solvers):

#### DMMG:

#### SNES (Nonlinear Solvers):

- Removed all minimization support in PETSc. TAO package should be used for this functionality.

#### SLES (Linear Solvers):

#### KSP (Krylov Subspace Methods):

- Support -ksp_unpreconditioned_norm in -ksp_type cr

#### PC (Preconditioners):

- Added support for PCType PCMAT (PC based on a matvec)
- Added support for PCType PCHYPRE (includes PILUT, EUCLID, and BoomerAMG)
- Cholesky - additional info from factorization

#### MAT (Matrices):

- SBAIJ matmult - improve performance by optimizing communication.
- markdiagonal - performance optimization.
- SuperLU interface improved (check page 75 in the user's manual)
- DSCPACK interface inproved
- Spooles interface added

#### DA (Distributed Arrays):

#### VEC (Vectors):

#### IS (Index Sets):

#### Draw (Graphics):

- Added flag to support turning off axis resizing

#### Viewers:

- Allow drawing rectangles in postscript

#### System:

#### Error Handling:

#### Event Logging:

#### Fortran Interface: