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# Changes: 2.2.1

General:

- Introduced 4 new PETSc data types: PetscInt, PetscErrorCode, PetscMPIInt and PetscBLASInt. For 99% of users these are just int or integer*4 and you do not need to change your code.

- For users with more than roughly 2 billion unknowns you can run configure with –with-64-bit-ints and then PetscInt will represent 64 bit integers, long long int in C and integer*8 in Fortran. But the the other 3 types remain 32 bit (i.e. int in C and integer*4 in Fortran). Now you can index into vectors and matrices with virtually unlimited sizes.

Vec:

- VecSetStashInitialSize() -> VecStashSetInitialSize()

- VecConvertMPIToAll() and VecConvertMPIToZero() have been replaced with VecScatterCreateToAll() and VecScatterCreateToZero()

IS:

- ISSum() now has a throughput argument instead of one in and one output.

Mat:

- MatSetStashInitialSize() -> MatStashSetInitialSize()

- added MatFactorInfoInitialize()

- added MatStashGetInfo()

- added MatGetVecs()

- added MatIsSymmetric(), MatIsTranspose() now take a tolerance flag for equality (use 0.0 for identical)

- added MatMPIAIJSetPreallocationCSR() and MatMPIBAIJSetPreallocationCSR()

PC:

- ICC now uses Manteuffel shift by default

- If matrix is symmetric, PC defaults to ICC when possible, if you told with MatSetOption(mat,MAT_SYMMETRIC)

- PCSetVector() is gone (no longer needed)

- PCNullSpaceAttach() is gone, use KSPSetNullSpace()

- MatGetSubmatrices() now preserves symmetric flag of original matrix

- hypre BoomerAMG (-pc_type hypre -pc_hypre_type boomeramg) now uses one 1 cycle of multigrid as preconditioner (Previously it used either a decrease in residual of 10^-7 or a maximum of 20 iterations

KSP:

- Note that a relative residual tolerance now means that ||r_k|| < tol*||b||

- Removed KSPSetRhs() and KSPSetSolution(), pass

- Added KSPSetNullSpace(), KSPGetNullSpace()

DA:

- Added DAGetGhostedCoordinates() and DAGetCoordinateDA() (see src/dm/da/examples/tutorials/ex3.c)

- Added DACoor2d and DACoor3d (see src/dm/da/examples/tutorials/ex3.c)

- DAGetInterpolation() now provides the correct interpolation for nonuniform grids using the coordinate information provided with DASetCoordinates(). (see src/dm/da/examples/tutorials/ex3.c)

config/configure.py:

- –with-c/f-blas-lapack -> –download-c/f-blas-lapack=yes

- –with-c/f-blas-lapack-if-needed -> –download-c/f-blas-lapack=ifneeded

- added –download-mpich=yes,no,ifneeded

- added –download-mpich-device=

- added –download-mpich-machines=[machines]

- added configure including download support for hypre, parmetis

- added configure support (without download) to Mumps, UMF, Superlu,SuperLU_dist,DSCPACK

- Made configure much more robust

SNES:

- Added -snes_converged_reason

- Added SNESSetRhs(snes,rhs) to allow for solving F(x) = rhs

TS:

DMMG:

- Added DMMGSetNullSpace()

SYS:

Fortran:

ExternalPackages: