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<h1> Docs: Changes: 2.3.0</h1>
<p align="center"><font color="#ff0000" size="5"><a name="CHANGES">CHANGES</a>
in PETSc 2.3.0 </font></p>
<p><u><b>General:</b></u></p>
<ul>
<li>BOPT cocept is removed. Currently the functionality is
replaced with configure options. i.e:<br>
c++
->
--with-clanguage=cxx
[default: c]<br>
complex ->
--with-scalar-type=complex [default: real]<br>
O
->
--with-debugging=0
[default: 1]<br>
The equivalent of building BOPT=g, BOPT=O versions for
PETSC_ARCH=linux-gnu is now:<br>
config/configure.py [options] -PETSC_ARCH=linux-gnu<br>
config/configure.py [options] --with-debugging=0
-PETSC_ARCH=linux-gnu-opt<br>
<br>
</li>
<li>Python bindings added to PETSc. <br>
To use, configure with: --with-python=1 ---with-shared=1<br>
To build, use: 'make python' after building PETSc libraries.<br>
Example in src/snes/examples/tutorials/ex1.py<br>
</li>
<li>Options database keys -trmalloc[_xxx] are changed to
-malloc[_xxx] </li>
<li>-get_resident_set_size and -trinfo are changed to
-memory_info </li>
<li>PetscTrValid() -> PetscMallocValidate(), PetscTrDebug()
-> PetscMallocDebug() </li>
<li>-trdebug -> -malloc_debug </li>
<li>PetscGetResidentSetSize() ->
PetscMemoryGetCurrentUsage(), added PetscMemoryGetMaximumUsage() and
PetscMemorySetGetMaximumUsage() </li>
<li>PetscTrSpace() -> PetscMallocGetCurrentUsage() and
PetscMallocGetMaximumUsage() </li>
<li>added PetscOptionsEnum() and PetscOptionsGetEnum() </li>
<li>added PetscBag object for managing user created structs
including initializing them and serializing them. </li>
<li>removed PetscSetCommWorld(). Now you can directly assign to PETSC_COMM_WORLD before PetscInitialize().</li>
</ul>
<p></p>
<p><u><b>Vec:</b></u></p>
<ul>
<li>Faster generation of VecScatter for many processes when
indices are mostly sorted</li>
<li>Changed BLAS-type interfaces to PETSc-style:
<ul>
<li>VecShift</li>
<li>VecScale</li>
<li>VecSet</li>
<li>VecSetRandom</li>
<li>VecAXPY</li>
<li>VecAXPBY</li>
<li>VecAYPX</li>
<li>VecMAXPY</li>
<li>VecWAXPY</li>
</ul>
</li>
<li>Changed order of arguments in pointwise routines:
<ul>
<li>VecPointwiseMult</li>
<li>VecPointwiseMax</li>
<li>VecPointwiseMin</li>
<li>VecPointwiseMaxAbs</li>
<li>VecPointwiseDivide</li>
</ul>
</li>
</ul>
<p></p>
<p><u><b>Mat:</b></u></p>
<ul>
<li>Changed MatConvert to require a reuse parameter to denote
inplace converstion</li>
<li>Added Cholesky and ICC support to SeqBAIJ</li>
<li>Added the argument MatFactorInfo to MatLUFactorNumeric()
and MatCholeskyFactorNumeric()</li>
<li>Faster MatSetValues()</li>
<li>Faster parallel-matrix vector products</li>
<li>Changed MatCreate() to take only a communicator</li>
<li>Added MatSetSize() to specify matrix sizes</li>
<li>Changed BLAS-type interfaces to PETSc-style:
<ul>
<li>MatAXPY</li>
<li>MatAYPX</li>
<li>MatScale</li>
<li>MatShift</li>
</ul>
</li>
<li>Change MatZeroRows() and MatZeroRowsLocal() to use arrays,
and added IS versions</li>
</ul>
<p></p>
<p><u><b>PC:</b></u> </p>
<ul>
<li>Added PCILUReorderForNonzeroDiagonal() and
PCLUReorderForNonzeroDiagonal()</li>
<li>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</li>
<li>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</li>
<li>PCMG: will automatically using the outer pmat operator to
define the finest level operator if not user supplied</li>
<li>PCMG: added MGUseGalerkin(), -pc_mg_galerkin option to have
coarser grid matrices computed from the finest grid matrix</li>
<li>PCMG: now does referencing counting on set vectors and
restriction/interpolation matrices so user need not keep reference to
free later</li>
<li>PCMG: if user does not provide restriction the
interpolation is used and vis versa</li>
<li>PCMG: if user does not provide Vecs for each level, will
automatically provide them</li>
<li> All routines that began with MG now begin with PCMG</li>
<li>Added PCShellSet/GetContext() and removed the context
passed into PCSetApply() and PCSetApplyRichardson()</li>
</ul>
<p></p>
<p><u><b>KSP:</b></u></p>
<ul>
<li>-ksp_cg_Hermitian and -ksp_cg_symmetric have been changed
to -ksp_cg_type Hermitian or symmetric</li>
<li>Changed options for -ksp_gmres_cgs_refinement_type from
never or ifneeded or always to REFINE_NEVER or REFINE_IFNEEDED or
REFINE_ALWAYS </li>
<li><br>
</li>
</ul>
<p></p>
<p><u><b>config/configure.py:</b></u></p>
<ul>
</ul>
<p></p>
<p><u><b>SNES:</b></u></p>
<ul>
<li>Changed the name and calling sequence for
SNESSetLineSearchCheck() to SNESLineSearchSetPostCheck() and added a
SNESLineSearchSetPreCheck()</li>
<li>Changed the names of all SNESxxxxLineSearchyyyy() to
SNESLineSearchxxxxyyyy() per PETSc naming standard. </li>
<li>Now allow a constant vector to be specified in SNESSolve()</li>
<li>Removed the Vec argument from SNESSetUp()</li>
<li>Corrected the order of function and context arguments in:
<ul>
<li>SNESGetFunction()</li>
<li>SNESGetJacobian()</li>
</ul>
</li>
</ul>
<p></p>
<p> <u><b>TS:<br>
</b></u> </p>
<ul>
</ul>
<p></p>
<p><span style="font-weight: bold; text-decoration: underline;">DA:</span><br>
</p>
<ul>
<li>Added DAVecGet/RestoreArrayDOF() allowing indexing in the
dimension of degrees of freedom at each point on the lattice. </li>
<li>Faster DAGlobalToLocal() etc for dof > 1. </li>
</ul>
<p></p>
<p><span style="font-weight: bold; text-decoration: underline;">DMMG:</span><br>
</p>
<ul>
<li>Consolidated DMMG functionality into the new header file
"petscdmmg.h".</li>
</ul>
<p></p>
<p><span style="font-weight: bold; text-decoration: underline;">SYS:<br>
</span></p>
<ul>
<li>PetscSetCommWorld() removed. [one can directly do
PETSC_COMM_WORLD = comm - before PetscInitialize()]<br>
</li>
</ul>
<ul>
</ul>
<p></p>
<p><span style="font-weight: bold; text-decoration: underline;">Fortran:</span><br>
</p>
<ul>
</ul>
<p></p>
<p><span style="font-weight: bold; text-decoration: underline;">ExternalPackages:</span><br>
</p>
<li>ML support added.</li>
<p></p>
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