# Changes: 3.2

```{rubric} General:
```

- --download-c-blas-lapack is replaced with --download-f2cblaslapack
- --with-precision=\_\_float128 --download-f2cblaslapack is now
  support for newish GNU gcc compiler
- Calling sequence of PetscBinarRead.m has been changed
- All XXXDestroy() functions now take a pointer to the object itself
  so that it can be nullified after destruction.
- PetscError() and SETERRQX() now take a MPI_Comm as the first
  argument to indicate where the error is known. If you don't know
  what communicator use then pass in PETSC_COMM_SELF
- Added PetscObjectAddOptionsHandler() that allows adding new
  routines to any object that are called to process options when
  XXXSetFromOptions() is called.
- Changed PetscTruth to PetscBool, PETSC_TRUTH to PETSC_BOOL,
  PetscOptionsTruth to PetscOptionsBool, etc.
- Introduced PetscCopyMode
- Changed -log_history to -history and PetscLogOpenHistory()
  PetscLogCloseHistory() to PetscOpenHistory(), PetscCloseHistory()
  because "log" is reserved for related to the performance logging
- Changed PetscOptionsPrint() to PetscOptionsView()
- Changed PetscLogPrintSummary() to PetscLogView()
- Using gcc 4.6 you can now ./configure --with-precision=\_\_float128
  --download-qblaslapack to get computations in quad precision.
  gfortran 4.6 is also supported. Warning some of the PETSc printing
  of numbers in some places will print garbage. I haven't figured
  out a way to handle the %G format. Can be run in parallel :-)
- PetscFListFind() now takes a searchlibraries flag, if this is set
  and the function is NOT found in the function list then the
  libraries and executable are searched (when shared or dynamic
  libraries are used). Previously it always search the libraries and
  executables if not found in the list.
- PetscOpenMPxxx() utilities are now PetscHMPIxxx() for hierarchical
  MPI, the previous name was bad

```{rubric} Logging:
```

- PetscCookie changed to PetscClassId in all forms.

```{rubric} config/configure.py:
```

- --with-64-bit-pointers option removed. It doesn't work properly
  anyway. The user should specify the correct 32bit or 64bit
  compilers to configure. For eg:
  `configure --with-cc='gcc -m64'             --with-fc='gfortran -m64'`
- Python requirement is changed from 2.2 to 2.3
- Changed --with-shared to --with-shared-libraries,
  --known-mpi-shared to --known-mpi-shared-libraries and
  --with-dynamic to --with-dynamic-loading
- 'ifneeded' support removed. '--download-package=ifneeded' should
  now be '--download-package'
- The make macro PETSC_INCLUDE has been replaced by
  PETSC_CC_INCLUDES and PETSC_FC_INCLUDES for C and Fortran,
  respectively.

```{rubric} IS:
```

- ISBlock(),ISStride() are removed. Use
  PetscTypeCompare((PetscObject)is,ISBLOCK,&flag),
  PetscTypeCompare((PetscObject)is,ISSTRIDE,&flag) instead.
- Added ISCreate(), ISSetType(), ISRegister() etc to match style of
  other PETSc objects. Also added ISGeneralSetIndices(),
  ISBlockSetIndices(), ISStrideSetStride()
- ISCreateGeneral() and ISCreateBlock() now takes PetscCopyMode as
  an argument and hence ISCreateGeneralNC() and
  ISCreateGeneralWithArray() are not needed and removed. Use
  ISCreateGeneral() with the argument PETSC_OWN_POINTER and
  PETSC_USE_POINTER instead.
- ISLocalToGlobalMappingCreate() now takes PetscCopyMode as an
  additional argument and ISLocalToGlobalMappingCreateNC() is no
  longer needed and removed
- ISStrideToGeneral() is replaced with ISToGeneral() that works for
  all basic IS types.
- ISCreateBlock() now takes indexing relative to block, no longer
  relative to element. This is to match the paradigm of
  Vec/MatSetValuesBlocked()
- ISBlockGetBlockSize() is now ISGetBlockSize(). Block sizes can be
  set for conforming ISGENERAL and ISSTRIDE using ISSetBlockSize().
- ISAllGatherIndices() is removed, use ISCreateGeneral() then
  ISAllGather().

```{rubric} PF:
```

- The source array is marked constant in PFApply and the callback.

```{rubric} Vec:
```

- changed VecSqrt() to VecSqrtAbs()
- VecLoad() and VecLoadIntoVector() have been merged into a single
  NEW VecLoad() that takes a partially constructed vector as input
  and loads according to any type or sizes that have previously been
  set into the Vec.
- VecDestroyVecs(PetscInt n,Vec \*\*) instead of
  VecDestroyVecs(Vec\*\*,PetscInt n), also VecDestroyVecsF90(PetscInt
  n,{Vec, pointer :: x},PetscErrorCode ierr)
- VecLoad() does NOT access the options database to check for the
  VecType, call VecSetFromOptions() first if you wish to check it.
- VecDestroyVecs() now takes the pointer to the first array and
  zeros it on return
- VecDestroy() now zeros the pointer to the destroyed vector so it
  cannot be reused
- VecDestroyVecs(PetscInt n,Vec \*\*) instead of
  VecDestroyVecs(Vec\*\*,PetscInt n)

```{rubric} VecScatter:
```

- The ghost indices for VecCreateGhostBlock() and
  VecCreateGhostBlockWithArray() are now by block instead of by
  entry.

```{rubric} Mat:
```

- MAT_SOLVER_XXX is now MATSOLVERXXX
- MAT_PARTIONING_XXX is now MATPARTITIONINGXXX
- MATCOLORING_XXX is now MATCOLORINGXXX
- MATORDERING_XXX is now MATORDERINGXXX
- It is an error to call MatSetOption() before the implementation
  has been created (after MatSetSizes() and MatSetType()). Formerly,
  options were silently ignored in this circumstance.
- Added MatSetMumpsIcntl()
- MatLoad() now takes a created Mat as input (and no longer a Mat
  type), if you provide the size and type in the Mat then that is
  used other defaults are used.
- MATCRL -> MATAIJCRL, MATSEQCRL -> MATSEQAIJCRL, MATMPICRL ->
  MATMPIAIJCRL
- MatCreateSeqCRL() -> MatCreateSeqAIJCRL() MatCreateMPICRL() ->
  MatCreateMPIAIJCRL()
- MATCSRPERM -> MATAIJPERM, MATSEQCSRPERM -> MATSEQAIJPERM,
  MATMPICSRPERM -> MATMPIAIJPERM
- MatCreateSeqCSRPERM() -> MatCreateSeqAIJPERM()
  MatCreateMPICSRPERM() -> MatCreateMPIAIJPERM()
- Added MatZeroRowsColumns() and MatZeroRowsColumnsIS().
- MatZeroRows() and MatZeroRowsIS() now take an x and b vector as
  optional arguments; if these are provided then the b\[idx[i]\] is
  set to diag\*x\[idx[i]\]\] for all rows listed in idx[].
- MatSetLocalToGlobalMapping() and MatSetLocalToGlobalMappingBlock()
  now take separate row and column maps. MatPreallocateSetLocal()
  has an extra argument for the column mapping.
- MatLoad() does NOT access the options database to check for the
  MatType, call MatSetFromOptions() first if you wish to check it.
- Removed MatMFFDSetFromOptions() since one can call
  MatSetFromOptions()
- MatGetLocalMat() and MatGetLocalMatCondensed() are now
  MatMPIAIJGetLocalMat() and MatMPIAIJGetLocalMatCondensed()
- MatOption MAT_USE_COMPRESSEDROW changed to
  MAT_CHECK_COMPRESSED_ROW

```{rubric} PC:
```

- PCFieldSplitSetIS() and PCFieldSplitSetFields() now take a
  split-name parameter which is used to define the options database
  keys.
- CHOLMOD can be used for Cholesky factorization using AIJ or
  SBAIJ(1) matrix formats.
- PCREDUNDANT now uses the inner KSP with the inner PC. Default is
  still preonly for KSP and LU for PC so default behavior is the
  same but now you can use for example -redundant_ksp_gmres.
  PCRedundantGetPC() is now changed to PCRedundantGetKSP()
- The header "petscmg.h" is renamed to "petscpcmg.h", "petscasa.h"
  is renamed to "petscpcasa.h".
- The preconditioner PCBFBT has been removed. The same functionality
  is available in PCFIELDSPLIT.
- PCOPENMP is now PCHMPI and its prefix is now -hmpi\_ for
  heirarchical MPI
- PCMGSetGalerkin() has a second argument of type PetscBool.

```{rubric} KSP:
```

- KSPSetPreconditionerSide() changed to KSPSetPCSide() to match name
  of second argument
- -ksp_right_pc -ksp_left_pc changed to -ksp_pc_side
  left,right,symmetric to match KSPSetPCSide()
- Added KSPGMRESGetRestart() and KSPGMRESGetCGSRefinementType()
- Added KSPGMRESGetOrthogonalization()
- KSPAddOptionsChecker() is replaced with
  PetscObjectAddOptionsHandler()
- Added KSPSPECEST which estimates the spectrum on the first solve
  and uses it to configure a reduction-free method for subsequent
  solves, intended for use when reductions are expensive such as
  levels of multigrid.

```{rubric} SNES:
```

- Added SNESLineSearchSetMonitor() and -snes_ls_monitor.
- Add SNESKSPONLY, for solving linear problems with SNES.
- Added the minlambda argument to SNESLineSearchGetParams() and
  SNESLineSearchSetParams().

```{rubric} TS:
```

- Rename TSCRANK_NICHOLSON to TSCN and TSRUNGE_KUTTA to TSRK for
  consistency.
- TSSetIFunction() and TSSetRHSFunction() have an additional
  argument for the vector to compute the function value in. If
  PETSC_NULL is used, then one is created by the TS.
- TSSetMatrices() has been removed, use TSSetIFunction() and
  TSSetRHSFunction(), perhaps providing Jacobian matrices and
  TSComputeRHSFunctionLinear() and/or
  TSComputeRHSJacobianConstant(). See
  src/ts/examples/tutorials/ex{2,4,5,6}.c for an example.
- Added TSARKIMEX: additive Runge-Kutta implicit-explicit methods
  for multi-rate systems.
- Changed TSStep() interface to only perform one step, added
  TSSolve() to perform multiple steps with callbacks and monitors if
  desired.
- Added TSSetExactFinalTime(), replaces
  TSSundialsSetExactFinalTime().

```{rubric} DM/DA:
```

- Change array argument of DAGetArray and related functions from
  void\*\* to void\* to avoid the need for an explicit cast (the
  argument still has the meaning of a pointer to d-dimensionally
  indexed array of user-defined node type, old code will still
  compile correctly but the cast is no longer necessary).
- DAGetCoordinates(), DAGetGhostedCoordinates(), and
  DAGetCoordinateDA() now return borrowed references. The returned
  object should not be destroyed by the user.
- Added DAVecGetArrayF90()
- Changed DASetVertexDivision to DASetOwnershipRanges
- The SDA object and all its method have been removed
- The DA, ADDA, Slice and DMComposite objects are now all
  represented by a DM object.
- Routines that began with ADDA and Slice now begin with DMADDA and
  DMSlice
- DA/ADDA/Slice/DMCompositeGetMatrix() -> DMGetMatrix(), similar for
  all other routines that have a DM version
- Removed DASetType(), DARegister() etc since they will all be
  handled via DMSetType() etc
- Added DMSetUp() that is called, for example, after all the
  parameters are passed to the DM object to actually construct the
  data structures; replace all calls to DASetType() with calls to
  DMSetUp()
- DAXXX() routines are now either DMXXX() or DMDAXXX() see
  petscdmda.h for details
- The operation DALocalToGlobal() which performed no communication
  can now be performed with DMLocalToGlobalBegin/End() with
  INSERT_VALUES.
- petscda.h, petscdadef.h and petscda.h90 are now petscdmda.h,
  petscdmdadef.h, and petscdmda.h90
- DAGetISLocalToGlobalMapping() and
  DAGetISLocalToGlobalMappingBlck() are now
  DMGetLocalToGlobalMapping() and DMGetLocalToGlobalMappingBlock()
  and are collective since they may be constructed lazily.
- DMGetBlockSize() is added.
- Changed DMDAPeriodicType to DMDABoundaryType, and changed this
  enum to only specify one boundary (one for each dimension). This
  enum is now one of DMDA_BOUNDARY_NONE, DMDA_BOUNDARY_GHOSTED, or
  DMDA_BOUNDARY_PERIODIC. See DMDABoundaryType man page for more.
- DMDASetPeriodicity() is now DMDASetBoundaryType(), and API is
  changed to take three DMDABoundaryType arguments.
- Changed API for DMDACreate\*D(), DMDAGetInfo() to take the correct
  number of DMDABoundaryType enums for the dimension.
- DMDASetGhostedCoordinates() is added to set coordinates of
  non-periodic ghost cells.

```{rubric} DMMG:
```

```{rubric} PetscViewer:
```

- PETSC_VIEWER_XXX is now PETSCVIEWERXXX
- Added PetscViewerASCIIOpenWithFILE() and PetscViewerASCIISetFILE()
- Added PetscViewerASCIISynchronizedAllow() which must be called
  before using PetscViewerASCIISynchronizedPrintf()

```{rubric} SYS:
```

- PetscOptionsAtoi(),PetscOptionsAtod(),PetscOptionsAtol() ->
  PetscOptionsStringToInt(), PetscOptionsStringToReal(),
  PetscOptionsStringToBool()
- PetscFListFind() takes an additional argument to look up the
  symbol in dynamically loaded libraries if not already in the list.
- Added PetscBagSetOptionsPrefix(), which allows a prefix for the
  option names of bag items.
- The preloading macros as well as developer-level logging and
  profiling functions have been namespaced, e.g. PreLoadBegin() is
  now PetscPreLoadBegin().

```{rubric} AO:
```

```{rubric} Sieve:
```

```{rubric} Fortran:
```

```{rubric} ExternalPackages:
```
