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# Changes: 3.7

General:

- -log_summary is deprecated, you should use -log_view

- PetscViewerSetFormat() is deprecated, you should use PetscViewerPushFormat() followed after the viewing with PetscViewerPopFormat()

- PetscMemoryShowUsage() and -memory_info changed to PetscMemoryView() and -memory_view

- PetscOptionsSetValue() may now be called BEFORE PetscInitialize() and any options set then will be used in the initialization process. These options are overwritten by command line options.

- The following routines now take an optional PetscOptions object as the first argument, use NULL to get the previous behavior.

      PetscOptionsHasName(PetscOptions,const char[],const char[],PetscBool *);
      PetscOptionsGetInt(PetscOptions,const char[],const char [],PetscInt *,PetscBool *);
      PetscOptionsGetBool(PetscOptions,const char[],const char [],PetscBool  *,PetscBool *);
      PetscOptionsGetReal(PetscOptions,const char[],const char[],PetscReal *,PetscBool *);
      PetscOptionsGetScalar(PetscOptions,const char[],const char[],PetscScalar *,PetscBool *);
      PetscOptionsGetIntArray(PetscOptions,const char[],const char[],PetscInt[],PetscInt *,PetscBool *);
      PetscOptionsGetRealArray(PetscOptions,const char[],const char[],PetscReal[],PetscInt *,PetscBool *);
      PetscOptionsGetScalarArray(PetscOptions,const char[],const char[],PetscScalar[],PetscInt *,PetscBool *);
      PetscOptionsGetBoolArray(PetscOptions,const char[],const char[],PetscBool [],PetscInt *,PetscBool *);
      PetscOptionsGetString(PetscOptions,const char[],const char[],char[],size_t,PetscBool *);
      PetscOptionsGetStringArray(PetscOptions,const char[],const char[],char*[],PetscInt*,PetscBool *);
      PetscOptionsGetEList(PetscOptions,const char[],const char[],const char*const*,PetscInt,PetscInt*,PetscBool *);
      PetscOptionsGetEnum(PetscOptions,const char[],const char[],const char*const*,PetscEnum*,PetscBool *);
      PetscOptionsGetEnumArray(PetscOptions,const char[],const char[],const char*const*,PetscEnum*,PetscInt *,PetscBool *);
      PetscOptionsSetAlias(PetscOptions,const char[],const char[]);
      PetscOptionsSetValue(PetscOptions,const char[],const char[]);
      PetscOptionsClearValue(PetscOptions,const char[]);
      PetscOptionsAllUsed(PetscOptions,PetscInt*);
      PetscOptionsUsed(PetscOptions,const char *,PetscBool*);
      PetscOptionsView(PetscOptions,PetscViewer);
      PetscOptionsInsert(PetscOptions,int*,char ***,const char[]);
      PetscOptionsInsertFile(MPI_Comm,PetscOptions,const char[],PetscBool );
      PetscOptionsInsertString(PetscOptions,const char[]);
      PetscOptionsPrefixPush(PetscOptions,const char[]);
      PetscOptionsReject(PetscOptions,const char[],const char[]);
      PetscOptionsGetAll(PetscOptions,char*[]);

- PetscLogBegin() is now PetscLogDefaultBegin().

Configure/Build:

- Added –download-packages-dir=directory to support easy use of –download-xxx behind firewalls

- –download-package for externalpackage with a gitrepo will never be stale. Each time configure is invoked - it will do a ‘git fetch’ and ‘git checkout commit-id’. And if the commit-id changes from the previous build - the package will be rebuilt. To prevent this sync [and use previous snapshot] - one can use –download-package-commit=HEAD

- Added –with-libpng/–with-giflib/–with-libjpeg and corresponding –download versions to support PNG/GIF/JPEG image generation

- Removed support for AfterImage in favor of libpng/GIFLIB/libjpeg

IS:

PetscDraw:

- Added option -draw_cmap to use a named colormap (e.g., hue (default), jet, coolwarm, parula, viridis) in the drawing of contour plots.

- Support for saving images and movies was improved. Support for generating binary PPM images is built-in, but the format is uncompressed and images are large (640x480 pixels ~ 900 KiB). PETSc can optionally generate PNG/GIF/JPEG images using the libpng/GIFLIB/libjpeg packages (configure –with-package/–download-package). These libraries are popular, well maintained, and available through most packages managers (dnf/yum, apt, brew). For most users, PNG images should be enough.

- Added routine PetscDrawSave(), users should explicitly call it to save images after configuring with PetscDrawSetSave().

- The PetscDrawSynchronizedXXX() routines were removed, the corresponding PetscDrawXXX() are now collective.

PF:

Vec:

- For complex numbers VecNorm(v,NORM_1,) will return the traditional 1 norm of the 2 norm of the complex numbers; that is the 1 norm of the absolute values of the complex entries. Previously it returned the 1 norm of the 1 norm of the complex entries (what is returned by the BLAS routine asum()). Both are valid norms but most people expect the former.

VecScatter:

PetscSection:

Mat:

PC:

- If the DM has a CreateRestriction() function the PCMG automatically uses that to create the restriction operator instead of defaulting to using the transpose of the interpolation

- Added -pc_hypre_boomeramg_nodal_coarsen - where n is from 1 to 6 (see HYPRE_BOOMERAMGSetNodal())

- Added -pc_hypre_boomeramg_vec_interp_variant where v is from 1 to 4 (see HYPRE_BoomerAMGSetInterpVecVariant())

- see PCHYPRE to allow taking advantage of MatSetNearNullSpace() for hypre BoomerAMG

- Added PCTelescope which supports running solvers on sub-communicators. This PC allows re-partitioning of coarse levels solves within PCMG when using Galerkin coarse level operators.

KSP:

- KSPSetMonitor(KSPMonitorXXX, calls now require passing a viewer as the final argument, you can no longer pass a NULL)

- -ksp_monitor_solution now takes arguments of the form [viewertype[:filename[:formatoption]]] allowing viewing the solution in many ways. To get back the previous behavior use -ksp_monitor_solution draw

- A Flexible Conjugate Gradient (FCG) implementation has been added as KSPFCG.

- New implementations for pipelined, flexible Krylov methods have been added as KSPPIPEFGMRES, KSPPIPEFCG, and KSPPIPEGCR.

SNES:

- SNESSetMonitor(SNESMonitorXXX, calls now require passing a viewer as the final argument, you can no longer pass a NULL)

- -snes_monitor_solution/residual/solution_update now takes arguments of the form [viewertype[:filename[:formatoption]]] allowing viewing the solution in many ways. To get back the previous behavior use -ksp_monitor_solution draw

SNESLineSearch:

- -snes_linesearch_monitor now takes an optional [:filename] argument, changed SNESLineSearchSet/GetMonitor to SNESLineSearchSet/GetDefaultMonitor

- Added SNESLineSearchMonitorSet()

- Partial support for -snes_linesearch_monitor_solution_update

TS:

- You must call TSSetExactFinalTime() or use the option -ts_exact_final_time before calling TSSolve()

- TSSetMonitor(TSMonitorXXX, calls now require passing a viewer as the final argument, you can no longer pass a NULL)

- -ts_monitor_solution now takes arguments of the form [viewertype[:filename[:formatoption]]] allowing viewing the solution in many ways. To get back the previous behavior use -ksp_monitor_solution draw

- -ts_monitor_binary_solution filename should now be written as -ts_monitor_solution binary:filename

- Renamed TSSetEventMonitor() to TSSetEventHandler(). Updated many TS implementations to support event detection.

- Updated TSTHETA, TSBEULER, and TSCN to support time adaptivity by estimating the local truncation error with a BDF-2 formula.

- Updated TSALPHA implementation. Removed TSAlphaSetAdapt() and TSAlphaAdaptDefault(), use TSAlphaUseAdapt() instead.

- Added TSBDF, an implementation of backward difference formulas using constant order (1 to 6) and supporting time adaptivity.

- Implemented new interface for second-order systems to avoid using a first-order system formulation. Added TSALPHA2 implementation (generalized-alpha, Chung & Hubert 1993) featuring user-controlled damping of high-frequency modes and time adaptivity through a BDF-2 formula.

DM/DA:

- Added DMShellSetCreateRestriction

- Added the generic option prefix interfaces: DMGetOptionsPrefix(), DMAppendOptionsPrefix()

- DMLabel labels are now available to all DM objects, not just DMPlex object

- DMClone() now handles copying the coordinates, so that DMCopyCoordinates() is no longer necessary

DMPlex:

PetscViewer:

- Replaced PetscViewerASCIISynchronizedAllow() with PetscViewerASCIIPushSynchronized() PetscViewerASCIIPopSynchronized()

SYS:

Tao:

- Removed convergence tolerances -tao_fatol and tao_frtol also remove these two parameters from TAOSetTolerance() and TaoGetTolerance()

AO:

Sieve:

Fortran: