Changes: 2.3.0#
General:
- The equivalent of building BOPT=g, BOPT=O versions for PETSC_ARCH=linux-gnu is now: config/configure.py [options] -PETSC_ARCH=linux-gnu config/configure.py [options] –with-debugging=0 -PETSC_ARCH=linux-gnu-opt 
- Python bindings added to PETSc. To use, configure with: –with-python=1 —with-shared=1 To build, use: ‘make python’ after building PETSc libraries. Example in src/snes/examples/tutorials/ex1.py 
- Options database keys -trmalloc[_xxx] are changed to -malloc[_xxx] 
- -get_resident_set_size and -trinfo are changed to -memory_info 
- PetscTrValid() -> PetscMallocValidate(), PetscTrDebug() -> PetscMallocDebug() 
- -trdebug -> -malloc_debug 
- PetscGetResidentSetSize() -> PetscMemoryGetCurrentUsage(), added PetscMemoryGetMaximumUsage() and PetscMemorySetGetMaximumUsage() 
- PetscTrSpace() -> PetscMallocGetCurrentUsage() and PetscMallocGetMaximumUsage() 
- added PetscOptionsEnum() and PetscOptionsGetEnum() 
- added PetscBag object for managing user created structs including initializing them and serializing them. 
- removed PetscSetCommWorld(). Now you can directly assign to PETSC_COMM_WORLD before PetscInitialize(). 
Vec:
- Faster generation of VecScatter for many processes when indices are mostly sorted 
- Changed BLAS-type interfaces to PETSc-style: - VecShift 
- VecScale 
- VecSet 
- VecSetRandom 
- VecAXPY 
- VecAXPBY 
- VecAYPX 
- VecMAXPY 
- VecWAXPY 
 
- Changed order of arguments in pointwise routines: - VecPointwiseMult 
- VecPointwiseMax 
- VecPointwiseMin 
- VecPointwiseMaxAbs 
- VecPointwiseDivide 
 
Mat:
- Changed MatConvert to require a reuse parameter to denote inplace conversion 
- Added Cholesky and ICC support to SeqBAIJ 
- Added the argument MatFactorInfo to MatLUFactorNumeric() and MatCholeskyFactorNumeric() 
- Faster MatSetValues() 
- Faster parallel-matrix vector products 
- Changed MatCreate() to take only a communicator 
- Added MatSetSize() to specify matrix sizes 
- Changed BLAS-type interfaces to PETSc-style: - MatAXPY 
- MatAYPX 
- MatScale 
- MatShift 
 
- Change MatZeroRows() and MatZeroRowsLocal() to use arrays, and added IS versions 
PC:
- Added PCILUReorderForNonzeroDiagonal() and PCLUReorderForNonzeroDiagonal() 
- Replace PCLUSetDamping(), PCILUSetDamping(), PCCholeskySetDamping() and PCICCSetDamping() by PCFactorSetShiftNonzero(). Change the option database keys -pc_lu_damping, -pc_ilu_damping, -pc_cholesky_damping and -pc_icc_damping to -pc_factor_shift_nonzero 
- Replace PCLUSetShift(), PCILUSetShift(), PCCholeskySetShift() and PCICCSetShift() by PCFactorSetShiftPd(). Change the option database keys -pc_lu_shift, -pc_ilu_shift, -pc_cholesky_shift and -pc_icc_shift to -pc_factor_shfit_positive_definite 
- PCMG: will automatically using the outer pmat operator to define the finest level operator if not user supplied 
- PCMG: added MGUseGalerkin(), -pc_mg_galerkin option to have coarser grid matrices computed from the finest grid matrix 
- PCMG: now does referencing counting on set vectors and restriction/interpolation matrices so user need not keep reference to free later 
- PCMG: if user does not provide restriction the interpolation is used and vis versa 
- PCMG: if user does not provide Vecs for each level, will automatically provide them 
- All routines that began with MG now begin with PCMG 
- Added PCShellSet/GetContext() and removed the context passed into PCSetApply() and PCSetApplyRichardson() 
KSP:
- -ksp_cg_Hermitian and -ksp_cg_symmetric have been changed to -ksp_cg_type Hermitian or symmetric 
- Changed options for -ksp_gmres_cgs_refinement_type from never or ifneeded or always to REFINE_NEVER or REFINE_IFNEEDED or REFINE_ALWAYS 
config/configure.py:
SNES:
- Changed the name and calling sequence for SNESSetLineSearchCheck() to SNESLineSearchSetPostCheck() and added a SNESLineSearchSetPreCheck() 
- Changed the names of all SNESxxxxLineSearchyyyy() to SNESLineSearchxxxxyyyy() per PETSc naming standard. 
- Now allow a constant vector to be specified in SNESSolve() 
- Removed the Vec argument from SNESSetUp() 
- Corrected the order of function and context arguments in: - SNESGetFunction() 
- SNESGetJacobian() 
 
TS:
DA:
- Added DAVecGet/RestoreArrayDOF() allowing indexing in the dimension of degrees of freedom at each point on the lattice. 
- Faster DAGlobalToLocal() etc for dof > 1. 
DMMG:
- Consolidated DMMG functionality into the new header file “petscdmmg.h”. 
SYS:
- PetscSetCommWorld() removed. [one can directly do PETSC_COMM_WORLD = comm - before PetscInitialize()] 
Fortran:
ExternalPackages:
- ML support added.