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# Changes: 3.14

General:

- Deprecate PetscIgnoreErrorHandler(), use PetscReturnErrorHandler()

- Replace -debugger_nodes with -debugger_ranks

- Change PETSCABORT() to abort instead of MPI_Abort if run under -start_in_debugger

- Add PETSC_MPI_THREAD_REQUIRED to control the requested threading level for MPI_Init

- Add CUDA-11 support, but with CUDA-11, -mat_cusparse_storage_format {ELL, HYB} are not supported anymore. Only CSR is supported

- Add CUDA-11 option -mat_cusparse_spmv_alg {MV_ALG_DEFAULT, CSRMV_ALG1 (default), CSRMV_ALG2} for users to select cuSPARSE SpMV algorithms

- Add CUDA-11 option -mat_cusparse_spmm_alg {ALG_DEFAULT, CSR_ALG1 (default), CSR_ALG2} for users to select cuSPARSE SpMM algorithms

- Add CUDA-11 option -mat_cusparse_csr2csc_alg {ALG1 (default), ALG2} for users to select cuSPARSE CSR to CSC conversion algorithms

- Remove option -cuda_initialize, whose functionality is succeeded by -cuda_device xxx

- Change -cuda_set_device to -cuda_device, which can now accept NONE, PETSC_DEFAULT, PETSC_DECIDE in addition to non-negative integers

- Change PetscCUDAInitialize(comm) to PetscCUDAInitialize(comm,dev)

- Add PetscCUDAInitializeCheck() to do lazy CUDA initialization

- Add -hip_device, -hip_view, -hip_synchronize, PetscHIPInitialize(comm,dev) and PetscHIPInitializeCheck(). Their usage is similar to their CUDA counterpart

- Add PetscOptionsInsertStringYAML() and -options_string_yaml for YAML-formatted options on the command line

- Add PETSC_OPTIONS_YAML environment variable for setting options in YAML format

- Add PetscDetermineInitialFPTrap(); fix so that when Linux or macOS Fortran linker enables catching floating point divide by zero the trapping is disabled for LAPACK routines that generate divide by zero, for example, the reference implementation of ieeeck()

- Add floating point exception handling support for freebsd and Windows

- Consistently set exception handling for divide by zero, invalid, underflow, and overflow for all systems when possible

- -options_monitor and -options_monitor_cancel have immediate global effect, see PetscInitialize() for details

- Remove PetscOptionsSetFromOptions()

- Remove PetscOptionsMonitorCancel()

- Remove -h and -v options. Use -help and -version instead. The short options -h and -v can now be used within user codes

- Import petsc4py sources into PETSc source tree. Continue to use –download-petsc4py to build petsc4py

- Add an experimental Kokkos backend for PETSc GPU operations. For example, one can use ‘–download-kokkos –download-kokkos-kernels –with-kokkos-cuda-arch=TURING75’ to build PETSc with a Kokkos CUDA backend, and then use -vec_type kokkos -mat_type aijkokkos. With that, vector and matrix operations on GPUs are done through Kokkos kernels. Currently, VECKOKKOS supports all vector operations, but MATAIJKOKKOS only supports MatMult() and its variants. More complete support is coming

Configure/Build:

- Change –with-matlabengine-lib= to –with-matlab-engine-lib= to match –with-matlab-engine, print error message for deprecated form

- Change –download-mpich default for optimized build to ch3:nemesis and keep ch3:sock for debug build

- On macOS, –with-macos-firewall-rules can be used to automate addition of firewall rules during testing to prevent firewall popup windows

IS:

PetscDraw:

VecScatter / PetscSF:

- Add a Kokkos backend to SF. Previously, SF could only handle CUDA devices. Now it can handle other devices that Kokkos supports when PETSc is configured with Kokkos. The command line option is: -sf_backend cuda | kokkos

PF:

Vec:

- Fix memory leaks when requesting -vec_type {standard|cuda|viennacl} when the vector is already of the desired type

- Add VecViennaCLGetCL{Context|Queue|Mem} for VECVIENNACL to access the CL objects underlying the PETSc Vecs

- Add VecCreate{Seq|MPI}ViennaCLWithArray and VecViennaCL{Place|Reset}Array

- Add VecCreate{Seq|MPI}CUDAWithArrays to create VECCUDA sharing the CPU and/or GPU memory spaces

- Add VecCreate{Seq|MPI}ViennaCLWithArrays to create VECVIENNACL sharing the CPU and/or GPU memory spaces

- Add an experimental vector type VECKOKKOS

- Add VecGetOffloadMask to query a Vec’s offload mask

PetscSection:

- PetscSectionGetClosurePermutation(), PetscSectionSetClosurePermutation(), and PetscSectionGetClosureInversePermutation() all require a new argument depth and the getters require closure size to be specified by the caller. This allows multiple closure permutations to be specified, e.g., for mixed topology meshes and boundary faces and for variable-degree spaces. The previous behavior only applied to points at height zero

PetscPartitioner:

Mat:

- Add MatSetLayouts()

- Add MatSeqAIJSetTotalPreallocation(Mat,PetscInt) for efficient row by row setting of a matrix without requiring preallocating for each row

- Add full support for MKL sparse matrix-matrix products in MATSEQAIJMKL

- Fix few bugs for MATSEQSBAIJ when missing diagonal entries

- Fix few bugs when trying to reuse matrices within MatMat operations

- Deprecate MatFreeIntermediateDataStructures() in favor of MatProductClear()

- Add MatShellSetMatProductOperation() to allow users specify symbolic and numeric phases for MatMat operations with MATSHELL matrices

- Add support for distributed dense matrices on GPUs (MATMPIDENSECUDA)

- Add few missing get/set/replace array operations for MATDENSE and MATDENSECUDA matrices

- Add MatDense{Get|Restore}ColumnVec to access memory of a dense matrix as a Vec, together with read-only and write-only variants

- Add MatDense{Get|Restore}SubMatrix to access memory of a contiguous subset of columns of a dense matrix as a Mat

- Deprecate MatSeqDenseSetLDA in favor of MatDenseSetLDA

- Add support for A*B and A^t*B operations with A = AIJCUSPARSE and B = DENSECUDA matrices

- Add basic support for MATPRODUCT_AB (resp. MATPRODUCT_AtB) for any matrices with mult (multtranspose) operation defined and B dense

- Add MATSCALAPACK, a new Mat type that wraps a ScaLAPACK matrix

- Add support for MUMPS-5.3.0 distributed right-hand side

- Add support for MatMultHermitianTranspose with SEQAIJCUSPARSE

- Remove default generation of explicit matrix for MatMultTranspose operations with SEQAIJCUSPARSE. Users can still require it via MatSeqAIJCUSPARSESetGenerateTranspose

- Add MatOrderingType external returns a NULL ordering to allow solver types MATSOLVERUMFPACK and MATSOLVERCHOLMOD to use their orderings

- Add an experimental matrix type MATAIJKOKKOS

PC:

- Fix bugs related with reusing PCILU/PCICC/PCLU/PCCHOLESKY preconditioners with SEQAIJCUSPARSE matrices

- GAMG uses MAT_SPD to default to CG for the eigen estimate in Chebyshev smoothers

- Add PCMatApply() for applying a preconditioner to a block of vectors

- Add -pc_factor_mat_ordering_type external to use ordering methods of MATSOLVERUMFPACK and MATSOLVERCHOLMOD

- PCSetUp_LU,ILU,Cholesky,ICC() no longer compute an ordering if it is not to be used by the factorization (optimization)

KSP:

- Add KSPGMRESSetBreakdownTolerance() along with option -ksp_gmres_breakdown_tolerance to 3.14.3

- Change KSPReasonView() to KSPConvergenceReasonView()

- Change KSPReasonViewFromOptions() to KSPConvergedReasonViewFromOptions()

- Add KSPConvergedDefaultSetConvergedMaxits() to declare convergence when the maximum number of iterations is reached

- Fix many KSP implementations to actually perform the number of iterations requested

- Add KSPMatSolve() for solving iteratively (currently only with KSPHPDDM and KSPPREONLY) systems with multiple right-hand sides, and KSP{Set|Get}MatSolveBlockSize() to set a block size limit

- Chebyshev uses MAT_SPD to default to CG for the eigen estimate

- Add KSPPIPECG2, a pipelined solver that reduces the number of allreduces to one per two iterations and overlaps it with two PCs and SPMVs using non-blocking allreduce

SNES:

- Change SNESReasonView() to SNESConvergedReasonView()

- Change SNESReasonViewFromOptions() to SNESConvergedReasonViewFromOptions()

SNESLineSearch:

TS:

- Fix examples using automatic differentiation. One can use ‘–download-adolc –download-colpack’ to install the AD tool

- Improve shift handling in TSComputeXXXJacobian()

- Update TSTrajectory (type memory) to preallocate a checkpoint pool to be reused across multiple TS runs

TAO:

- Add lm regularizer to TAOBRGN. This regularizer turns BRGN into a Levenberg-Marquardt algorithm. TAOBRGNGetDamping() vector returns the damping vector used by this regularizer

DM/DA:

- Change DMComputeExactSolution() to also compute the time derivative of the exact solution

- Add time derivative of the solution argument to DMAddBoundary(), DMGetBoundary(), PetscDSAddBoundary(), PetscDSUpdateBoundary(), PetscDSGetBoundary()

DMPlex:

- Deprecate DMPlexCreateFromCellList[Parallel]() in favor of DMPlexCreateFromCellList[Parallel]Petsc() which accept PETSc datatypes (PetscInt, PetscReal)

- Expose DMPlexBuildFromCellList(), DMPlexBuildFromCellListParallel(), DMPlexBuildCoordinatesFromCellList(), DMPlexBuildCoordinatesFromCellListParallel(). They now accept PETSc datatypes

- Add DMPlexMatSetClosureGeneral() for different row and column layouts

- DMPlexGet/RestoreClosureIndices() now take argument for ignoring the closure permutation and for modifying the input values for SetClosure()

- DMPlexComputeInterpolatorNested() now takes a flag allowing nested interpolation between different spaces on the same mesh

- Add DMPlexInsertBoundaryValuesEssentialBdField() to insert boundary values using a field only supported on the boundary

- Change DMPlexCreateSubpointIS() to DMPlexGetSubpointIS()

- Add PetscDSGet/SetBdJacobianPreconditioner() to assembly a PC for the boundary Jacobian

- Add DMSetRegionNumDS() to directly set the DS for a given region

- Add PetscDSGetQuadrature() to get the quadrature shared by all fields in the DS

- Add several refinement methods for Plex

- Add DMPlexGet/SetActivePoint() to allow user to see which mesh point is being handled by projection

- Add DMPlexComputeOrthogonalQuality() to compute cell-wise orthogonality quality mesh statistic

- Change DMPlexSetClosurePermutationTensor() to set tensor permutations at every depth, instead of just height 0

- Add DMComputeExactSolution() which uses PetscDS information

- Change DMSNESCheckFromOptions() and DMTSCheckFromOptions() to get exact solution from PetscDS

- Change DMPlexSNESGetGeometryFVM() to DMPlexGetGeometryFVM()

- Change DMPlexSNESGetGradientDM() to DMPlexGetGradientDM()

- Change DMPlexCreateSphereMesh() to take a radius

- Add DMPlexCreateBallMesh()

- Change DMSNESCheckDiscretization() to also take the time

- Add argument to DMPlexExtrude() to allow setting normal and add options for inputs

- Add DMPlexInsertTimeDerivativeBoundaryValues()

- Add field number argument to DMPlexCreateRigidBody()

DT:

- Add PetscDTJacobiNorm() for the weighted L2 norm of Jacobi polynomials

- Add PetscDTJacobiEvalJet() and PetscDTPKDEvalJet() for evaluating the derivatives of orthogonal polynomials on the segment (Jacobi) and simplex (PKD)

- Add PetscDTIndexToGradedOrder() and PetscDTGradedOrderToIndex() for indexing multivariate monomials and derivatives in a linear order

- Add PetscSpaceType “sum” for constructing FE spaces as the sum or concatenation of other spaces

- Add PetscDSGet/SetExactSolutionTimeDerivative()

- Add PetscDSSelectDiscretizations()

- Add argument to DM nullspace constructors

PetscViewer:

- Deprecate the legacy `.vtk` (PETSC_VIEWER_ASCII_VTK) viewer. Please use `.vtr` or `.vts` for structured grids (DMDA) and `.vtu` for unstructured (DMPlex)

SYS:

- Add PetscPowInt64 returning a 64bit integer result for cases where PetscPowInt result overflows 32bit representations

- Add PetscTimSort[WithArray]() for improved performance when sorting semi-ordered arrays of any type

- Add PetscIntSortSemiOrdered[WithArray](), PetscMPIIntSortSemiOrdered[WithArray](), PetscRealSort[WithArrayInt]() which employ PetscTimSort[WithArray]() as backends respectively to more efficiently sort semi-ordered arrays of various Petsc datatypes

- Add PetscMallocTraceSet/Get() to allow tracing of all PetscMalloc calls

- Add PetscMallocLogRequestedSizeSet/Get() to allow reporting of the original requested size for mallocs, rather than the total size with alignment and header

AO:

Convest:

- Add argument to PetscConvEstUseTS(), so you can use -ts_convergence_temporal 0 to check spatial convergence of a TS model

Fortran: