Docs: Changes: 2.1.6

CHANGES in PETSc 2.1.6

General:

• Added support for Cray X1
• Added option '-suggest' to petscarch script. It suggests some possible PETSC_ARCHes to use
• Installation instructions are rewritten
  

Vec:

• VecNorm now caches NORM_2
• Added VecStrideScale(), VecStrideGather(), VecStrideScatter()
• Added VecBlockNorm(),VecBlockMax(),VecBlockMin(),VecBlockScale()
  

Mat:

• The interface to external packages that support direct solvers has been reorganized.  This is implemented using new matrix types MATSEQAIJSPOOLES, MATMPIAIJSPOOLES, MATSEQSBAIJSPOOLES, MATMPISBAIJSPOOLES, MATSUPERLU, MATSUPERLU_DIST, MATUMFPACK,MATESSL, MATLUSOL, MATAIJMUMPS, MATSBAIJMUMPS, MATDSCPACK
  
• Added new convenience matrix types which automatically switch between Seq and MPI implementations depending on the size of the communicator used during creation: MATAIJ, MATBAIJ, MATSBAIJ, MATMAIJ, MATDENSE, MATBDIAG
• Changed default matrix-free compute h to use WP since it uses fewer reductions
• Replace the datatypes MatLUInfo and MatILUInfo by MatFactorInfo
• Added cholesky support to SeqAIJ
• Added support for SUBSET_NONZERO_PATTERN with MatAXPY for AIJ & BAIJ
  
• Added MatIsSymmetric() for AIJ
• Added LDA support in SeqDense
• The ncols argument made optional in MatGetRow()
• Added MAT_KEEP_ZEROED_ROWS for MPIROWBS
• Removed -aij_oneindex support from AIJ code
• Added MatPartitioningSetPartitionWeights() - useable with ParMetis
• MatGetSubMatrices() now works for ROWBS
  

PC:

• Added PCICCSetDamping() or -pc_icc_damping
• Added -pc_constant_null_space
• Added PCILUSetShift() or -pc_ilu_shift to support damping using the identity
• Added PCLUSetShift()  or -pc_lu_shift to support damping using the identity
• Added PCICCSetShift() or -pc_icc_shift to support damping using the identity
  

KSP:

• Added a new ksp_type LGMRES
• Added KSPSetComputeSingularValues() support to ksp_type FGMRES
  

TS:

• Added support for Runge-Kutta using ts_type TS_RUNGE_KUTTA
  

DMMG:

• -dmmg_jacobian_period -1 => jacobian is frozen after initial construction
  

DA:

• Allow user preallocation of jacobian using DASetGetMatrix()
  
• DAGetMatrix now correctly returns the requested type.
• -mat_type typename overloads the requested type for DAGetMatrix

SYS:

• Added new viewer_type PETSC_VIEWER_NETCDF, PETSC_VIEWER_HDF4
• PETSc error handlers now trap many more signals.
  

Fortran:

• PetscPushErrorHandler() and PetscPopErrorHandler() now supported
• PetscPrintf() and PetscSynchronizedPrintf() now work in fortran with a single string

External Packages:

• Added TSPVodeGetParameters()
• Parmetis-3 support added using MatPartitionSetNParts(), ISPartitionCount()
• MUMPS support added, including complex (using mat_type  MATAIJMUMPS, MATSBAIJMUMPS)
• Updated SuperLU_DIST interface to SuperLU_DIST_2.0
• Added Spooles complex support
• Added Spooles cholesky for SeqAIJ
• ADIC: ad_GRAD_MAX is now set in the application and compiled into code when compiling appplication
• The following variable names - in the buildsystem are changed - that correspond with SuperLU_DIST
    SUPERLUDIST_INCLUDE  ->  SUPERLU_DIST_INCLUDE
    SUPERLUDIST_LIB  ->  SUPERLU_DIST_LIB
    PETSCHAVE_SUPERLU  ->  PETSC_HAVE_SUPERLU