# Docs: 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: