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<li class="toctree-l1"><a class="reference internal" href="../overview/plex_transform_table.html">Summary of Unstructured Mesh Transformations</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../manual/dmplex.html">DMPlex: Unstructured Grids</a></li>
<li class="toctree-l3"><a class="reference internal" href="../manual/dmstag.html">DMSTAG: Staggered, Structured Grid</a></li>
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<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.22/docs"> 3.22</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.21/docs"> 3.21</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.20/docs"> 3.20</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.19/docs"> 3.19</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.18/docs"> 3.18</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.17/docs"> 3.17</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.16/docs"> 3.16</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.15/docs"> 3.15</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.14/docs"> 3.14</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.13/docs"> 3.13</a></li>
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<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.11/docs"> 3.11</a></li>
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<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.6/docs"> 3.6</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.5/docs"> 3.5</a></li>
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<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.3/docs"> 3.3</a></li>
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<section class="tex2jax_ignore mathjax_ignore" id="changes-3-8">
<h1>Changes: 3.8<a class="headerlink" href="#changes-3-8" title="Link to this heading">#</a></h1>
<p class="rubric">General:</p>
<ul class="simple">
<li><p><code class="docutils notranslate"><span class="pre">--download-metis</span></code> is changed to not builds metis with flag
<code class="docutils notranslate"><span class="pre">-DMETIS_USE_DOUBLEPRECISION=1</span></code> to have consistent behavior
between single/double/quad precision builds (and with external
build of metis). This affects parmetis as well</p></li>
</ul>
<p class="rubric">Configure/Build:</p>
<ul class="simple">
<li><p>removed with-mpiuni-fortran-binding option</p></li>
<li><p>removed with-fortran-interfaces option</p></li>
<li><p>removed with-fortran-datatypes option</p></li>
<li><p>Added –download-openblas –download-openblas-64-bit-blas-indices</p></li>
</ul>
<p class="rubric">IS:</p>
<ul class="simple">
<li><p>Changed IS_COLORING_GHOSTED to IS_COLORING_LOCAL to match
convention.</p></li>
<li><p>Added ISRenumber to renumber an IS into a contiguous set.</p></li>
<li><p>ISGlobalToLocalMappingType is now ISGlobalToLocalMappingMode.</p></li>
<li><p>Added ISGlobalToLocalMappingSetType() to change the algorithm used
to apply the mapping. Choices are ISGLOBALTOLOCALMAPPINGBASIC
(faster) or ISGLOBALTOLOCALMAPPINGHASH (for large problems, much
more scalable in memory usage)</p></li>
</ul>
<p class="rubric">PetscDraw:</p>
<p class="rubric">PetscRandom:</p>
<ul class="simple">
<li><p>Added PETSCRANDOM123, a wrapper to the counter-based random number
generator
<a class="reference external" href="http://www.deshawresearch.com/resources_random123.html">Random123</a>.</p></li>
</ul>
<p class="rubric">PF:</p>
<p class="rubric">Vec:</p>
<p class="rubric">VecScatter:</p>
<p class="rubric">PetscSection:</p>
<p class="rubric">Mat:</p>
<ul class="simple">
<li><p>Added a new argument in MatCreateLRC() to express the low-rank
correction as A+U*C*V’.</p></li>
<li><p>MatTranspose() now properly handles MAT_INITIAL_MATRIX,
MAT_REUSE_MATRIX, MAT_INPLACE_MATRIX.</p></li>
<li><p>Renamed MatCreateSubMatrix() to MatCreateSubMatrixVirtual().</p></li>
<li><p>Renamed MatSubMatrixUpdate() to MatSubMatrixUpdateVirtual().</p></li>
<li><p>Renamed MatGetSubMatrices() to MatCreateSubMatrices().</p></li>
<li><p>Added MatDestroySubMatrices().</p></li>
<li><p>Renamed MatGetSubMatricesMPI() to MatCreateSubMatricesMPI().</p></li>
<li><p>Renamed MatGetSubMatrix() to MatCreateSubMatrix().</p></li>
<li><p>Renamed MatGetSubMatrixOption() to MatCreateSubMatrixOption().</p></li>
<li><p>MatSetOption(mat,MAT_IGNORE_ZERO_ENTRIES,PETSC_TRUE) no longer
applies to zero values set or added to the matrix diagonal, they
are now not ignored and are included in the matrix nonzero
structure. This is useful for Jacobians passed to TS.</p></li>
<li><p>Added MatFactorSchurStatus.
MatFactorGet/Restore/CreateSchurComplement now take an extra
status argument.</p></li>
<li><p>Added MatMatSolveTranspose to solve transposed linear systems for
multiple right-hand sides.</p></li>
<li><p>Added MATAIJMKL and MATBAIJMKL to facilitate use of Intel MKL
sparse BLAS routines with matrices stored in AIJ/BAIJ format.</p></li>
</ul>
<p class="rubric">PC:</p>
<ul class="simple">
<li><p>The is_local argument to PCASMSetLocalSubdomains() is now ignored
UNLESS the PCASMType is set to restrict</p></li>
<li><p>Added PCMGSetNumberSmooth()</p></li>
<li><p>PCMGSetGalerkin() and -pc_mg_galerkin now take
PC_MG_GALERKIN_BOTH,PC_MG_GALERKIN_PMAT,PC_MG_GALERKIN_MAT,
PC_MG_GALERKIN_NONE as arguments instead of PetscBool</p></li>
<li><p>Added PCBDDCSetDivergenceMat to help BDDC to compute the flux
across the subdomain interfaces.</p></li>
<li><p>Removed PCBDDCSetNullSpace. Local nullspace information should now
be attached to the subdomain matrix via MatSetNullSpace.</p></li>
<li><p>Added additional PetscBool parameter to
PCBDDCCreateFETIDPOperators for the specification of the type of
multipliers.</p></li>
<li><p>Added additional string parameter to PCBDDCCreateFETIDPOperators
for the specification of the prefix (can be NULL).</p></li>
<li><p>FIELDSPLIT now extracts off-diag fieldsplit blocks from the
preconditioner instead of the jacobian by default. Use
-pc_fieldsplit_off_diag_use_amat to use the jacobian matrix.</p></li>
<li><p>Added PCFieldSplitSetSchurScale to control the scaling factor of
the Schur complement with the DIAG factorization. The
corresponding command line option is -pc_fieldsplit_schur_scale.</p></li>
</ul>
<p class="rubric">KSP:</p>
<ul class="simple">
<li><p>Added KSPFETIDP, a linear system solver based on the FETI-DP
method.</p></li>
<li><p>Added the KSPGuess class: available methods are KSPGUESSFISCHER
and KSPGUESSPOD. The new KSPGUESSPOD computes an initial guess
using the Proper Orthogonal Decomposition technique.</p></li>
<li><p>KSPFischerGuessCreate has been removed: see the man page of
KSPGUESSFISCHER for how to create a Fischer type initial guess.</p></li>
<li><p>KSPCHEBYSHEV: replace KSPChebyshevEstEigSetUseRandom() with
KSPChebyshevEstEigSetUseNoisy(), using a deterministic algorithm
to generate noisy vectors.</p></li>
</ul>
<p class="rubric">SNES:</p>
<p class="rubric">SNESLineSearch:</p>
<p class="rubric">TS:</p>
<ul class="simple">
<li><p>Changed TSGL to TSGLLE.</p></li>
<li><p>-ts_monitor binary now saves the timestep information as a REAL
entry consisting of the REAL_FILE_CLASSID followed by the real
value. PetscBinaryRead.m and PetscBinaryIO.py can read these in
automatically.</p></li>
<li><p>Added TSRK5BS scheme to TSRK.</p></li>
<li><p>Added TSADAPTDSP adaptive controller based on digital signal
processing techniques.</p></li>
<li><p>Removed command line option <code class="docutils notranslate"><span class="pre">-ts_theta_adapt</span></code>, use
<code class="docutils notranslate"><span class="pre">-ts_adapt_type</span> <span class="pre">basic</span></code> to turn on adaptivity in TSTHETA.</p></li>
<li><p>Remove command line option <code class="docutils notranslate"><span class="pre">-ts_alpha_adapt</span></code> and routines
TSAlphaUseAdapt()/TSAlpha2UseAdapt(), use <code class="docutils notranslate"><span class="pre">-ts_adapt_type</span> <span class="pre">basic</span></code>
to turn on adaptivity in TSALPHA/TSALPHA2.</p></li>
<li><p>Removed TSBDFUseAdapt(), using time step adaptivity in TSBDF is
now the default, use <code class="docutils notranslate"><span class="pre">-ts_adapt_type</span> <span class="pre">none</span></code> to turn adaptivity
off.</p></li>
<li><p>Added TSAdaptSetAlwaysAccept() to set whether to always accept
steps.</p></li>
<li><p>Added TSAdapt{Set|Get}Safety() to set safety factors and renamed
option <code class="docutils notranslate"><span class="pre">-ts_adapt_basic_[reject_]safety</span></code> to
<code class="docutils notranslate"><span class="pre">-ts_adapt_[reject_]safety</span></code>.</p></li>
<li><p>Renamed TSAdaptBasic{Set|Get}Clip() and option
<code class="docutils notranslate"><span class="pre">-ts_adapt_basic_clip</span></code> to TSAdapt{Set|Get}Clip() and
<code class="docutils notranslate"><span class="pre">-ts_adapt_clip</span></code>.</p></li>
<li><p>Added TSAdaptGetStepLimits() to get minimum and maximum allowed
time step.</p></li>
<li><p>Calling TSAdaptSetType() will reset all option values (safety
factors, clipping factors, etc) to default values.</p></li>
<li><p>Added TS{Set|Get}MaxSteps() and TS{Set|Get}MaxTime(), deprecated
TS{Set|Get}Duration().</p></li>
<li><p>Added TSGetStepNumber(), deprecated TSGetTimeStepNumber() and
TSGetTotalSteps().</p></li>
<li><p>Deprecated TSSetInitialTimeStep(), use TSSetTime() and
TSSetTimeStep().</p></li>
</ul>
<p class="rubric">DM/DA:</p>
<ul class="simple">
<li><p>Changed prototypes for DMCompositeGather() and
DMCompositeGatherArray()</p></li>
<li><p>Replace calls to DMDACreateXd() with DMDACreateXd(),
[DMSetFromOptions()] DMSetUp()</p></li>
<li><p>DMDACreateXd() no longer can take negative values for dimensions,
instead pass positive values and call DMSetFromOptions()
immediately after</p></li>
<li><p>Added DMSwarm which supports data management and data movement of
arbitrary fields defined on a point set. Such functionality is
useful for partcle based methods. High level support for
particle-in-cell methods is provided when using either a DMDA or
DMPLEX mesh.</p></li>
</ul>
<p class="rubric">DMPlex:</p>
<ul class="simple">
<li><p>Added DMPlexRefineSimplexToTensor to refine simplicial into tensor
product cell meshes.</p></li>
<li><p>Added PTScotch partitioner.</p></li>
</ul>
<p class="rubric">PetscViewer:</p>
<p class="rubric">SYS:</p>
<ul class="simple">
<li><p>-help now has the option -help intro that only prints the programs
help string and then exits the program</p></li>
<li><p>Petsc64bitInt -> PetscInt64, PetscIntMult64bit() ->
PetscInt64Mult(), PetscBagRegister64bitInt() ->
PetscBagRegisterInt64()</p></li>
</ul>
<p class="rubric">AO:</p>
<p class="rubric">Sieve:</p>
<p class="rubric">Fortran:</p>
<p>PETSC_NULL_INTEGER, PETSC_NULL_REAL etc are now declared as arrays of
size one instead of as scalar values.
New shorter calling sequence for PetscError() from Fortran
SETERRQ(), and CHKERRQ from Fortran now have the same behavior as in
C and automatically return on errors, they do not abort.
Correspondingly SERERRA() and CHKERRA() should be used in ‘program
main’ - as return is not possible from it. These macros should be
used from .F90 files because they require long lines
Simplified Fortran usage. Now you only include
petsc/finclude/petscXXX and use petscXXX</p>
<ul>
<li><p>For each Fortran function (and main) use the following</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="n">subroutine</span><span class="w"> </span><span class="n">mysubroutine</span><span class="p">(.....)</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><petsc/finclude/petscxxx.h></span>
<span class="w"> </span><span class="n">use</span><span class="w"> </span><span class="n">petscxxx</span>
<span class="w"> </span><span class="n">implicit</span><span class="w"> </span><span class="n">none</span>
</pre></div>
</div>
<p>For example if you are using SNES in your code you would have</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><petsc/finclude/petscsnes.h></span>
<span class="w"> </span><span class="n">use</span><span class="w"> </span><span class="n">petscsnes</span>
<span class="w"> </span><span class="n">implicit</span><span class="w"> </span><span class="n">none</span>
</pre></div>
</div>
</li>
<li><p>Instead of PETSC_NULL_OBJECT you must pass PETSC_NULL_XXX (for
example PETSC_NULL_VEC) using the specific object type XXX that
the function call is expecting.</p></li>
<li><p>Objects can be declared either as XXX a or type(tXXX) a, for
example Mat a or type(tMat) a. (Note that previously for those who
used types it was type(Mat) but that can no longer be used.</p></li>
</ul>
<p>Notes:</p>
<ul>
<li><p>There are no longer any .h90 files that may or need to be included</p></li>
<li><p>Like C the include files are now nested so you no longer need to
include for example</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><petsc/finclude/petscsys.h></span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><petsc/finclude/petscvec.h></span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><petsc/finclude/petscmat.h></span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><petsc/finclude/petscpc.h></span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><petsc/finclude/petscksp.h></span>
</pre></div>
</div>
<p>you can just include</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><petsc/finclude/petscksp.h></span>
</pre></div>
</div>
</li>
<li><p>there is now type checking of most function calls. This will help
eliminate bugs due to incorrect calling sequences. Note that
Fortran distinguishes between a argument that is a scalar (zero
dimensional array), a one dimensional array and a two dimensional
array (etc). So you may get compile warnings because you are
passing in an array when PETSc expects a scalar or vis-versa. If
you get these simply fix your declaration of the variable to match
what is expected. In some routines like MatSetValues() and friends
you can pass either scalars, one dimensional arrays or two
dimensional arrays, if you get errors here please send mail to
<a class="reference external" href="mailto:petsc-maint%40mcs.anl.gov">mailto:petsc-maint<span>@</span>mcs<span>.</span>anl<span>.</span>gov</a> and include enough of your code so we can
see the dimensions of all your variables so we can fix the
problems.</p></li>
<li><p>You can continue to use either fixed (.F extension) or free format
(.F90 extension) for your source</p></li>
<li><p>All the examples in PETSc have been updated so consult them for
clarifications.</p></li>
</ul>
</section>
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