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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Documentation: Changes: 2.0.28</title>
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<body bgcolor="#ffffff">
<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<h1>Documentation: Changes: 2.0.28</h1>
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h2 {
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<div id="main">
<div align="center">
<h2><a name="CHANGES">CHANGES</a> in PETSc 2.0.28 (see new <a href="#Features">features</a>)</h2>
</div>
<h4>General:</h4>
<ul>
<li>No longer support PETSC_ARCH=sun4</li>
<li>The macros in petscconf.h now begin with PETSC_</li>
<li>
<code>PetsReal()</code> and <code>PetscImaginary()</code> are now
<code>PetscRealPart()</code> <code>PetscImaginaryPart()</code>
</li>
<li>
-optionstable -> -options_table -optionsleft -> -options_left
but old left for compatibility
</li>
</ul>
<h4>AO (Application Orderings):</h4>
<h4>TS (Timestepping Solvers):</h4>
<ul>
<li>
<code>TSSetMonitor()</code> now takes an additional final optional
argument that monitor context.
</li>
</ul>
<h4>SNES (Nonlinear Solvers):</h4>
<ul>
<li>SNES_EQ_LS etc changed to drop _, for example SNESEQLS</li>
<li>
Changed calling sequence of SNES monitoring routines to add an
additional output parameter indicating why it converged or
diverged.
</li>
<li>
Added additional final argument to <code>SNESSetMonitor()</code>
an optional destroy routine for the monitor context.
</li>
<li>
Changed calling sequence of <code>MatSNESMFAddNullSpace()</code>
to take <code>PCNullSpace</code> object rather than array of
vectors.
</li>
<li>
Added final ctx argument to <code>SNESGetFunction()</code>,
<code>SNESGetGradient()</code> and
<code>SNESGetMinimizationFunction()</code>
</li>
</ul>
<h4>SLES (Linear Solvers):</h4>
<ul>
<li>See PC and KSP</li>
<li>
<code>SLESSolveTrans()</code> is now
<code>SLESSolveTranspose()</code>
</li>
<li>
<code>SLESSolve()</code> now ALWAYS returns a 0 or positive iteration
count. Call <code>KSPGetConvergedReason()</code> to see if converged
or diverged and why.
</li>
</ul>
<h4>KSP (Krylov Subspace Methods):</h4>
<ul>
<li>
Added additional final argument to <code>KSPSetMonitor()</code>
an optional destroy routine for the monitor context.
</li>
<li><code>KSPSolvetrans()</code> is now <code>KSPSolveTranspose()</code></li>
<li>
Added flexible gmres (use fgmres or KSPFGMRES as the type) see
<code>KSPFGMRESSetModifyPC()</code> for one way to change PC at
each iteration.
</li>
</ul>
<h4>PC (Preconditioners):</h4>
<ul>
<li>
<code>MGSetRestriction()</code> and <code>MGSetInterpolation()</code>
now accept PETSc figures out which one it is based on the number of
rows and columns. Now you don't need to use the Shell matrices if you
computed it "the other way then PETSc use to expect".
</li>
<li><code>PCApplyTrans()</code> is now <code>PCApplyTranspose()</code></li>
<li>
options -pc_ilu_mat_ordering_type <nd,...> and
-pc_lu_mat_ordering_type <nd,...> now set the ordering type.
</li>
</ul>
<h4>MAT (Matrices):</h4>
<ul>
<li>
Added two additional arguments to <code>MatCreate(MPI_Comm comm,int
m,int n,int M,int N,Mat *)</code> where m and n are the local
ownership sizes. To get the effect of the old
<code>MatCreate()</code> use m and n equal to PETSC_DECIDE
</li>
<li>
Changed <code>MatSetLocalToGlobalMappingBlocked()</code> to
<code>MatSetLocalToGlobalMappingBlock()</code> so that it would
be less then 32 characters long.
</li>
<li>
<code>MatSolveTrans()</code>and <code>MatSolveTransAdd()</code> are
now <code>MatSolveTransposeXXX()</code> <code>MatMultTrans()</code>
and <code>MatMultTransAdd()</code>are now
<code>MatMultTransposeXXX()</code>
</li>
<li>
<code>MatCreateMPIAdj()</code> changed to
<code>MatCreateMPICSR()</code>; <code>MatCreateSeqAdj()</code>
dropped.
</li>
<li>
Another <code>MatSetOption()</code>, <code>MAT_IGNORE_ZERO_ENTRIES</code> for
AIJ matrices with <code>ADD_VALUES</code>.
</li>
<li>
added matrix option <code>MAT_KEEP_ZEROED_ROWS</code> causes <code>
MatZeroRows()</code> to keep the original nonzero data structure and
just put 0.0 into the elements that are to be zeroed. Without this
option it removes the locations from the nonzero structure.
</li>
</ul>
<h4>DA (Distributed Arrays):</h4>
<h4>VEC (Vectors):</h4>
<ul>
<li>Added VecGetArray2d() and VecRestoreArray2d()</li>
</ul>
<h4>IS (Index Sets):</h4>
<ul>
<li>
Added second argument to <code>ISInvertPermutation</code>() that indicates
how many indices are to be stored on that processor; ignored for one
processor code. If you use <code>ISInvertPermutation</code>() simply add
a second argument of <code>PETSC_DECIDE</code>.
</li>
</ul>
<h4>Draw (Graphics):</h4>
<ul>
<li>DrawHistxxx changed to DrawHGxxx</li>
</ul>
<h4>Viewers:</h4>
<h4>System:</h4>
<ul>
<li>
Routines XXXRegister() are now XXXRegisterDynamic() used for
registering new object types in dynamic libraries and
XXXRegister_Private() is now XXXRegister() used to register new
object types whose definitions are in the exectuable.
</li>
<li>
The final argument to OptionsHasName() and
OptionsGetXXX() is a PetscTruth * instead of an
int*
</li>
<li>PETSc functions and objects that began with Table now begin with PetscTable</li>
<li>
Changed these routines to return an error code. extern int
PetscStrchr(const char[],char,char **); extern int PetscStrrchr(const
char[],char,char **); extern int PetscStrstr(const char[],const
char[],char **); extern int PetscStrtok(const char[],const
char[],char **); extern int PetscStrlen(const char[],int *); added
PetscStrallocpy(const char[],char **); PetscStrncmp() and
PetscStrcasecmp() now return PETSC_TRUE as a final argument if the
strings match else PETSC_FALSE. Note this means removing ! from your
current tests and adding it where you don't have it.
</li>
<li>PetscMemcmp() now has a final argument of true for matching memories.</li>
<li>
The Fortran versions of the PetscStrxxx() and PetscMemxxx() routines
also now have the error flag as the final argument
</li>
<li>
PetscFree() now always returns an error code that may be checked with
CHKERRQ(). On systems where free() returns a void (and the user has
no access to an error condition in free(), PetscFree() returns 0 i.e.
no error; on other systems it returns the error number from
free.
</li>
<li>The BT bitarray macros are now prefixed with PetscBT</li>
</ul>
<h4>Error Handling:</h4>
<h4>Event Logging:</h4>
<h4>Fortran Interface:</h4>
<div align="center">
<h2>New <a name="Features">features</a> in PETSc 2.0.28 (see <a href="#CHANGES">changes</a> above)</h2>
</div>
<h4>General:</h4>
<ul>
<li>
When doing string substitutions in library directory paths etc one
must use ${PETSC_DIR} ${BOPT} etc now instead of $PETSC_DIR etc. Also
you can put anything in {anything} as long as it is an environmental
variable or passed in the options database with -anything
</li>
<li>
Added PetscEmacsclientErrorHandler() -on_error_emacs [machinename] to
allow emacs to jump to error; can be used with any other error
handler.
</li>
<li>
So long as you have defined the macro __FUNC__ "main" before your
main C/C++ subroutine you can use SETERRQ() and CHKERRQ() instead of
SETERRA(), CHKERRA().
</li>
</ul>
<h4>AO (Application Orderings):</h4>
<h4>TS (Timestepping Solvers):</h4>
<h4>SNES (Nonlinear Solvers):</h4>
<ul>
<li>
Added <code>SNESSetLineSearchParams()</code> and
<code>SNESGetLineSearchParams()</code>, contributed by Matt
Knepley.
</li>
<li>
Added <code>SNESGetConvergedReason()</code> to find out if
a <code>SNESSolve()</code> has converged/diverged and why
</li>
<li>
Added <code>SNESMonitorVecUpdate()</code> and
-snes_vecmonitor_update to display the Newton update at each
iteration.
</li>
</ul>
<h4>SLES (Linear Solvers):</h4>
<ul>
<li>See PC and KSP</li>
</ul>
<h4>KSP (Krylov Subspace Methods):</h4>
<ul>
<li>
Added -ksp_gmres_krylov_monitor and
<code>KSPGMRESKrylovMonitor()</code> to allow one to view the
vectors in the Krylov space.
</li>
</ul>
<h4>PC (Preconditioners):</h4>
<ul>
<li>
We now provide a drop tolerance based ILU for SeqAIJ matrix format
via Yousef Saad's SPARSEKIT2 software. Use -pc_ilu_use_drop_tolerance
<dt,dtcol,rowmax> or
<code>PCILUSetUseDropTolerance</code>(pc,dt,dtcol,rowmax).
</li>
</ul>
<h4>MAT (Matrices):</h4>
<h4>DA (Distributed Arrays):</h4>
<h4>VEC (Vectors):</h4>
<h4>IS (Index Sets):</h4>
<h4>Draw (Graphics):</h4>
<ul>
<li><code>DrawCreate()</code> and <code>DrawOpenX()</code> now can take</li>
</ul>
<h4>Viewers:</h4>
<ul>
<li>
Added <code>ViewerASCIIUseTabs()</code> to allow turning off
tabbing during certain viewer operations.
</li>
<li>
Added <code>ViewerGetSingleton()</code>, ViewerRestoreSingleton()
to allow managing the calling a a sequential viewer from within
a parallel viewer.
</li>
<li>Added <code>ViewerASCIISynchronizedPrintf</code>(viewer,....)</li>
<li>
Binary and ASCII viewers can create compressed files by simply
appending a .gz on the filename.
</li>
<li>
PETSc now has a new viewer that generates rudimentary Postscript.
Improvements, additions may be added as needed.
<code>DrawOpenPS()</code>, or
<code>DrawSetType(,DRAW_PS);</code> or -draw_type ps
</li>
</ul>
<h4>System:</h4>
<ul>
<li>
using -trdump with PETSC_USE_STACK compile option (default for
BOPT=g*) will print the entire stack for each malloc, allow one to
more easily track down where mallocs where made that where not
freed.
</li>
<li>Added PetscSum_Op to replace MPI_SUM for reductions with MPIU_SCALAR</li>
<li>Added PetscMaxSum_Op to do max on first half of entries and sum on second half.</li>
<li>Added CHKMEMQ and CHKMEMA macros to help track down memory corruption.</li>
</ul>
<h4>Error Handling:</h4>
<h4>Event Logging:</h4>
<h4>Fortran Interface:</h4>
<ul>
<li>Added Fortran 90 interface support for HP Convex and Solaris.machine.</li>
</ul>
</div>
</body>
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