--- /dev/null
+// ---------------------------------------------------------------------
+// $Id$
+//
+// Copyright (C) 2013 by the deal.II authors
+//
+// This file is part of the deal.II library.
+//
+// The deal.II library is free software; you can use it, redistribute
+// it, and/or modify it under the terms of the GNU Lesser General
+// Public License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// The full text of the license can be found in the file LICENSE at
+// the top level of the deal.II distribution.
+//
+// ---------------------------------------------------------------------
+
+/**
+ * @page changes_between_8_0_and_8_1 Changes between Version 8.0 and 8.1
+
+<p>
+This is the list of changes made between the release of
+deal.II version 8.0.0 and that of 8.1.0.
+All entries are signed with the names of the author.
+</p>
+
+
+
+<!-- ----------- INCOMPATIBILITIES ----------------- -->
+
+<a name="incompatible"></a>
+<h3 style="color:red">Incompatibilities</h3>
+
+<p style="color:red">
+Following are a few modifications to the library that unfortunately
+are incompatible with previous versions of the library, but which we
+deem necessary for the future maintainability of the
+library. Unfortunately, some of these changes will require
+modifications to application programs. We apologize for the
+inconvenience this causes.
+</p>
+
+<ol>
+ <li>Changed: During the implementation of the 64-bit features for deal.II
+ 8.0, many linear algebra classes obtained a local typedef
+ <code>size_type</code> indicating the integer type that is used to index
+ into them. In some instances, this was accidentally set to
+ <code>types::global_dof_index</code> (which may be a 64-bit data type)
+ even in cases where this is clearly not going to work, for example for
+ FullMatrix::size_type, since we will not be able to store full matrix
+ objects of sizes for which a 32-bit index type is not sufficient. In
+ these cases, the typedef was reverted to just <code>unsigned int</code>.
+ <br>
+ (Wolfgang Bangerth, 2013/12/04)
+ </li>
+
+ <li> Removed: With the switch of the testsuite to CMake, the old report_features
+ and build test facilities are removed.
+ <br>
+ (Matthias Maier, 2013/12/03)
+ </li>
+
+ <li>
+ Changed: The kinds of template arguments for the VectorTools::interpolate
+ function taking a Mapping as first argument has changed. This was done to
+ work around a bug in the Intel ICC compiler which led to linker errors. Since
+ the actual function argument list remains unchanged, the only way you will
+ notice this change is if you <i>explicitly</i> specify template arguments.
+ The only place one would typically do that is if you take the address of
+ a template function. Since this is not a common operation, the impact of this
+ change is probably limited.
+ <br>
+ (Wolfgang Bangerth, 2013/11/27)
+ </li>
+
+ <li>
+ Changed: The ghost handling of the parallel::distributed::Vector class has
+ been reworked: The vector now carries a global state that stores whether
+ ghost elements have been updated or not. If a vector has ghost elements, it
+ does not allow calls to compress() any more. Instead, a compress operation
+ can now only be done when the ghost entries have been cleared before by
+ calling zero_out_ghosts() or operator=0. The state can be queried by the new
+ method has_ghost_elements(). This change avoids spurious entries to be
+ inserted with compress(), but requires some change in user codes. The
+ behavior of a ghosted vector is now very similar to ghosted PETSc and
+ Trilinos vectors. The only difference is that the <i>same</i> vector can
+ also be used as a non-ghosted vector which is designed for use in assembly
+ routines.
+ <br>
+ (Martin Kronbichler, 2013/10/18)
+ </li>
+
+ <li>
+ Removed: GridTools::collect_periodic_face_pairs. This function is superseded
+ by GridTools::collect_periodic_faces which exports an
+ std::vector<PeriodicFacepair<...>> instead.
+ <br>
+ (Matthias Maier, 2013/09/30)
+ </li>
+
+ <li>
+ Removed: The member function face_to_equivalent_cell_index() in
+ FiniteElementData has been removed. It had been deprecated a while
+ back already. Please use FiniteElement::face_to_cell_index() instead.
+ <br>
+ (Wolfgang Bangerth, 2013/08/09)
+ </li>
+
+ <li>
+ Changed: The typedefs DataOut::cell_iterator and
+ DataOut::active_cell_iterator were previously defined as
+ DoFHandler::(active)_cell_iterator, while they are now
+ Triangulation::(active)_cell_iterator. This is necessary to support DataOut
+ on multiple DoFHandler objects. This affects possible overloading of
+ DataOut::next_cell(cell_iterator). Use the typedef
+ DataOut::(active)_cell_iterator as argument type instead.
+ <br>
+ (Martin Kronbichler, 2013/07/24)
+ </li>
+</ol>
+
+
+<!-- ----------- GENERAL IMPROVEMENTS ----------------- -->
+
+<a name="general"></a>
+<h3>General</h3>
+
+
+<ol>
+ <li> Improved: The build system now supports usage of the library
+ out of the build directory without prior installation. This is done by
+ exporting an additional project configuration just for the build directory.
+ Furthermore, a bunch of convenience targets get now defined that just build
+ individual components (such as just the documentation or the libraries), and
+ if <tt>CMAKE_INSTALL_PREFIX</tt> is set, also install that specific component.
+ <br>
+ (Matthias Maier, Luca Heltai, 2013/12/03)
+ </li>
+
+ <li> Fixed: Missing instantiations of SparseDirectMUMPS have been added.
+ <br>
+ (Timo Heister, 2013/11/25)
+ </li>
+
+ <li> New: introduced "make test" that runs a minimal set of tests. We
+ encourage every user to run this, especially if they run in to problems.
+ The tests are automatically picked depending on the configuration and
+ will be shipped with every release.
+ <br>
+ (Timo Heister, Matthias Maier, 2013/11/08)
+ </li>
+
+ <li> Changed: It is now possible to restore a parallel Triangulation
+ (and solutions) with a different number of processors it was saved with
+ using Triangulation::save() and Triangulation::load().
+ <br>
+ (Timo Heister, 2013/11/02)
+ </li>
+
+ <li> Added support for Windows: It is now possible again to use gcc on Windows
+ in order to compile the library. We support gcc-4.8.1 on Cygwin64 and MinGW-w64.
+ <br>
+ (Matthias Maier, 2013/11/01)
+ </li>
+
+ <li> Changed: step-9, step-13 and step-14 have been converted to use the
+ more modern WorkStream concept for assembling linear systems and computing
+ error indicators in parallel.
+ <br>
+ (Bruno Turcksin, Wolfgang Bangerth, 2013/10/26)
+ </li>
+
+ <li> New: The testsuite is now ported to <a href="http://www.cmake.org/">
+ CMake</a> and uses CTest as test driver.
+ <br>
+ (Wolfgang Bangerth, Timo Heister, Matthias Maier, Bruno Turcksin, 2013/10/20)
+ </li>
+
+ <li>
+ Changed: multithreadinfo::n_default_threads is now deprecated. Use the
+ new n_threads() function instead, which works correctly with TBB.
+ <br>
+ (Timo Heister, 2013/10/02)
+ </li>
+
+ <li>
+ Changed: if configured with TBB but the number of threads is set to 1,
+ do not bother to use TBB in workstream.
+ <br>
+ (Timo Heister, 2013/10/02)
+ </li>
+
+ <li>
+ New: step-51 demonstrates the use of hybridized discontinuous Galerkin
+ methods in deal.II, using the face elements FE_FaceQ. The programs solves a
+ scalar convection-diffusion equation.
+ <br>
+ (Martin Kronbichler and Scott Miller, 2013/10/01)
+ </li>
+
+ <li>
+ New: There is now an element FE_FaceP that can be combined with FE_DGP in
+ hybridized DG methods.
+ <br>
+ (Martin Kronbichler, 2013/09/17)
+ </li>
+
+ <li>
+ Fixed: The DataOutBase::XDMFEntry class now has a proper serialization
+ function to allow for checkpointing.
+ <br>
+ (Eric Heien, 2013/09/27)
+ </li>
+
+ <li>
+ New: DataOutBase::DataOutFilter provides a way to remove duplicate vertices
+ and values from a solution vector when generating output. Currently it only
+ supports HDF5/XDMF output.
+ <br>
+ (Eric Heien, 2013/09/27)
+ </li>
+
+ <li>
+ Removed: DataOutBase::HDF5MemStream was removed and the functionality replaced
+ by DataOutBase::DataOutFilter. The user only manipulates these through
+ DataOutBase::write_hdf5_parallel so this change should be transparent.
+ <br>
+ (Eric Heien, 2013/09/27)
+ </li>
+
+ <li>
+ New: Like the usual DoFHandler class, the hp::DoFHandler class now also
+ has a cache that makes operations such as <code>cell-@>get_dof_indices(...)</code>
+ faster. This should accelerate many parts of the library that deal with
+ hp finite elements.
+ <br>
+ (Wolfgang Bangerth, 2013/09/10)
+ </li>
+
+ <li>
+ New: parallel::distributed::Triangulation now supports periodic boundaries.
+ DoFTools::make_periodicity_constraints and similar functions are now working
+ on parallel::distributed::Triangulation objects.
+ <br>
+ (Tobin Isaac, Craig Michoski, Daniel Arndt, 2013/09/06)
+ </li>
+
+ <li>
+ New: It is now possible to compile and link deal.II against LLVM's libcxx. For
+ this, a few issues with C++ standard violations are resolved.
+ <br>
+ (Matthias Maier, 2013/08/09)
+ </li>
+</ol>
+
+
+<!-- ----------- SPECIFIC IMPROVEMENTS ----------------- -->
+
+<a name="specific"></a>
+<h3>Specific improvements</h3>
+
+<ol>
+ <li> Fixed: Several functions in namespace GridTools were not instantiated
+ for parallel::distributed::Triangulation objects. This is now fixed.
+ <br>
+ (Denis Davydov, Wolfgang Bangerth, 2013/12/01)
+ </li>
+
+ <li> Improved: The methods ConstraintMatrix::distribute_local_to_global
+ now use scratch data that is private to each thread instead of allocating
+ it for every cell anew. This gives better performance, in particular in
+ parallel, of these operations, while maintaining thread-safety (when
+ accessing non-overlapping rows, no race condition can exist).
+ <br>
+ (Martin Kronbichler, 2013/12/03)
+ </li>
+
+ <li> Improved: When attempting operations such as FEValues::get_function_values()
+ or FEValues::shape_value(), the FEValues object needs to know that what these
+ functions return has been computed previously. What is computed is specified
+ by the update flags that are passed to the constructor of all FEValues, FEFaceValues
+ and FESubfaceValues objects. If a user attempts an operation for which the
+ corresponding flag was not specified, an exception is generated. This exception
+ did say previously what the cause was, but it was not overly explicit.
+ The exception now generates a message that says exactly what is going wrong.
+ <br>
+ (Wolfgang Bangerth, 2013/12/01)
+ </li>
+
+ <li> Fixed: GridGenerator::truncated_cone() failed if half_length < 0.5*radius in 3d.
+ <br>
+ (Timo Heister, 2013/11/25)
+ </li>
+
+ <li> Fixed: make_hanging_node_constraints failed with an exception in a
+ parallel::distributed computation if the element is
+ RaviartThomas (and probably others).
+ <br>
+ (Timo Heister, 2013/11/23)
+ </li>
+
+ <li> Improved: CMake: Added a configuration check for incompatible ninja
+ + icc setup, fixed several setup and performance issues with the
+ testsuite.
+ <br>
+ (Matthias Maier, 2013/11/20)
+ </li>
+
+ <li> Changed: when a dealii::Exception is thrown, defer the symbol lookup of the
+ stack trace to when it is needed. This improves performance if what() is never
+ called.
+ <br>
+ (Timo Heister, 2013/11/17)
+ </li>
+
+ <li> Fixed: GridGenerator::parallelogram was not instantiated properly
+ when using intel compilers.
+ <br>
+ (Timo Heister, 2013/11/17)
+ </li>
+
+ <li>
+ Fixed: MappingQ1::transform_real_to_unit_cell() could fail in some
+ cases with very elongated and twisted cells. This should now be fixed
+ with an algorithm that uses a better method of computing the Newton
+ convergence.
+ <br>
+ (Wolfgang Bangerth, 2013/11/17)
+ </li>
+
+ <li>
+ Fixed: VectorTools::compute_no_normal_flux_constraints had a bug that
+ only appeared in rare cases at vertices of the domain if one adjacent
+ cell had two boundary indicators selected for no normal flux and another
+ had only one. This is now fixed.
+ <br>
+ (Wolfgang Bangerth, 2013/11/17)
+ </li>
+
+ <li> Fixed: dealii::FETools::interpolation_difference was
+ not working for TrilinosWrappers::MPI::Vectors with ghost
+ entries. The TrilinosWrappers::VectorBase class has now a
+ get_mpi_communicator method similar to the PETSc vector
+ classes.
+ <br>
+ (Martin Steigemann, Martin Kronbichler, 2013/11/17)
+ </li>
+
+ <li> Fixed: Bundled fparser is now compiled with FP_USE_THREAD_SAFE_EVAL in
+ case of enabled threading support so that it is thread safe.
+ <br>
+ (Matthias Maier, reported by Francesco Cattoglio 2013/11/16)
+ </li>
+
+ <li> Fixed: The CellData class now has a default constructor that
+ sets the material and boundary indicators to zero. This fixes certain
+ internal errors with the Intel ICC compiler.
+ <br>
+ (Wolfgang Bangerth, 2013/11/13)
+ </li>
+
+ <li> Cleanup: Removed obsolete files and files with unknown licensing
+ status from the source tree. Along the way, parameter_gui now uses
+ default icons from the desktop environment instead of bundled ones.
+ <br>
+ (Matthias Maier, 2013/11/11)
+ </li>
+
+ <li> New: There is now a framework for coloring graphs, with functions
+ in namespace GraphColoring.
+ <br>
+ (Bruno Turcksin, Martin Kronbichler, 2013/11/06)
+ </li>
+
+ <li>
+ Fixed: the DerivativeApproximation class was not working correctly when
+ used with parallel vectors.
+ (Timo Heister, 2013/10/28)
+ </li>
+
+ <li>
+ ~Subscriptor and ~GrowingVectorMemory no longer throw an exception (the
+ former if disable_abort_on_exception was called) to be compatible with the
+ C++11 standard which otherwise requires the program to immediately call
+ std::terminate. This was done with a new macro "AssertNothrow".
+ <br>
+ (Wolfgang Bangerth, Matthias Maier, Bruno Turcksin 2013/10/22)
+ </li>
+
+ <li>
+ dealii::SolverControl::NoConvergence now inherits dealii::ExceptionBase and
+ is thrown via AssertThrow(false, ... ).
+ <br>
+ (Matthias Maier, 2013/10/20)
+ </li>
+
+ <li>
+ New: parallel::distributed::BlockVector has now methods update_ghost_values,
+ compress, zero_out_ghosts, and has_ghost_elements that do the respective
+ operation on each block of parallel::distributed::Vector.
+ <br>
+ (Martin Kronbichler, 2013/10/18)
+ </li>
+
+ <li>
+ Fixed: When deriving from DataOut to filter the cells where output is generated, there were two different bugs that result in segmentation faults or wrong cells written (example, step-18).
+ <br>
+ (Timo Heister, 2013/10/16)
+ </li>
+
+ <li>
+ New: GridIn::read_vtk() reads 2d and 3d meshes in VTK format.
+ <br>
+ (Mayank Sabharwal, Andreas Putz, 2013/10/07)
+ </li>
+
+ <li>
+ Fixed: ConstraintMatrix would not compress() the IndexSet in the constructor
+ leading to crashes that only happen in release mode. This is now fixed.
+ <br>
+ (Timo Heister, 2013/09/27)
+ </li>
+
+ <li>
+ Fixed: PetscWrappers::MatrixBase::row_length() no longer worked after recent changes
+ to PETSc (around PETSc release 3.4). This is now fixed.
+ <br>
+ (Wolfgang Bangerth, 2013/09/24)
+ </li>
+
+ <li>
+ New: Added write_visit_record that allows writing .visit files with multiple blocks
+ and multiple time steps.
+ <br>
+ (Fahad Alrashed, 2013/09/21)
+ </li>
+
+ <li>
+ Changed: GridTools::have_same_coarse_mesh was only instantiated for
+ MGDoFHandler arguments in debug mode. This is now fixed.
+ <br>
+ (Timo Heister, 2013/09/20)
+ </li>
+
+ <li>
+ Changed: GridTools::find_active_cell_around_point now throws the exception
+ GridTools::ExcPointNotFound
+ if the point is outside the Triangulation. This exception can be caught.
+ <br>
+ (Timo Heister, 2013/09/18)
+ </li>
+
+ <li>
+ Changed: we now call MPI_Init_thread instead of MPI_Init.
+ <br>
+ (Timo Heister, 2013/09/17)
+ </li>
+
+ <li>
+ Enhancement: It is now possible to use the build directory directly without
+ the need to install first. For this, a second copy of all necessary project
+ configuration files (deal.IIConfig.cmake, ..., Make.global_options) are
+ generated and deployed in the build directory. (This is fully compatible with
+ the old possibility to install into the build dir.)
+ <br>
+ (Matthias Maier, 2013/09/15)
+ </li>
+
+ <li>
+ Fixed: DoFTools::extract_locally_*_dofs now instantiated for hp::DofHandler.
+ <br>
+ (Jean-Paul Pelteret, 2013/09/11)
+ </li>
+
+ <li>
+ Changed: distributed::parallel:BlockVector::operator= now allows importing
+ of ghost values like all other vector types. Also added some new constructors
+ for BlockVector and Vector using IndexSets to mirror the other linear algebra
+ classes.
+ <br>
+ (Timo Heister, 2013/09/04)
+ </li>
+
+ <li>
+ Fixed: VectorTools::compute_no_normal_flux_constraints had a bug that
+ only manifested on complex meshes. This is now fixed.
+ <br>
+ (Chih-Che Chueh, Wolfgang Bangerth, 2013/09/04)
+ </li>
+
+ <li>
+ New: All vector classes now have functions <code>extract_subvector_to()</code>
+ that allow extracting not just a single value but a whole set.
+ <br>
+ (Fahad Alrashed, 2013/09/02)
+ </li>
+
+ <li>
+ Fixed: <code>common/Make.global_options</code> now exports enable-threads
+ correctly, furthermore, <code>lib-suffix</code>, <code>shared-lib-suffix</code>
+ and <code>static-lib-suffix</code> are now exported as well for better legacy
+ support.
+ <br>
+ (Matthias Maier, 2013/08/30)
+ </li>
+
+ <li>
+ New: The ParameterHandler class can now deal with including one parameter
+ file from another.
+ <br>
+ (Wolfgang Bangerth, 2013/08/25)
+ </li>
+
+ <li>
+ New: The method VectorTools::compute_normal_flux_constraints can be used to
+ force a vector finite element function to be normal to the boundary.
+ <br>
+ (Martin Kronbichler, 2013/08/23)
+ </li>
+
+ <li>
+ Improved: MappingQ now uses the points of the Gauss-Lobatto quadrature
+ formula as support points instead of equispaced ones. This allows its use
+ for high polynomial orders and also gives better interpolation of circular
+ boundaries. Beware that mappings of order three and higher will behave
+ slightly differently now (usually better).
+ <br>
+ (Martin Kronbichler, 2013/08/23)
+ </li>
+
+ <li>
+ Improved: Several .cc files in the deal.II directory have been split in
+ order to better utilize multiple processors when compiling in parallel and
+ reduce memory requirements of the compilation stage.
+ <br>
+ (Martin Kronbichler, 2013/08/22)
+ </li>
+
+ <li>
+ Fixed: The ParameterHandler::declare_entry() did not check that the
+ default value of a parameter indeed satisfies the pattern given for this
+ parameter (despite a statement in the documentation that this checking
+ would happen). This is now fixed.
+ <br>
+ (Wolfgang Bangerth, 2013/08/21)
+ </li>
+
+ <li>
+ New: Patterns::List and Patterns::Map now accept a string
+ different than the default comma that denotes the separator
+ between entries of the list or map.
+ <br>
+ (Wolfgang Bangerth, 2013/08/21)
+ </li>
+
+ <li>
+ Fixed: Some operations in the MappingQ class are now done in higher
+ precision arithmetic to mitigate the ill-conditioning that appears
+ when using mappings of high order (say, order 6 or 8 or 10).
+ <br>
+ (Juan Carlos Araujo Cabarcas, 2013/08/20)
+ </li>
+
+ <li>
+ Fixed: The SLEPcWrappers classes could not be compiled for 64-bit
+ indices. This is now fixed.
+ <br>
+ (Denis Davydov, Wolfgang Bangerth, 2013/08/20)
+ </li>
+
+ <li>
+ Fixed: SolutionTransfer used to crash whenever one transfered in the hp
+ context between cells that use FE_Nothing and FE_Q. This is now fixed.
+ <br>
+ (Krzyszof Bzowski, Wolfgang Bangerth, 2013/08/18)
+ </li>
+
+ <li>
+ Fixed: Under some circumstances (see http://code.google.com/p/dealii/issues/detail?id=82)
+ the DoFTools::make_periodicity_constraints() function could create cycles in
+ the ConstraintMatrix object. This is now fixed.
+ <br>
+ (David Emerson, Wolfgang Bangerth, 2013/08/16)
+ </li>
+
+ <li>
+ New: There is now a function ConstraintMatrix::are_identity_constrained().
+ <br>
+ (Wolfgang Bangerth, 2013/08/16)
+ </li>
+
+ <li>
+ New: TableHandler::write_text() now also supports output in
+ org-mode (http://orgmode.org/) format via a new entry in the
+ TableHandler::TextOutputFormat enumeration.
+ <br>
+ (Oleh Krehel, 2013/08/15)
+ </li>
+
+ <li>
+ New: There are now global functions <code>scalar_product</code>
+ that compute the scalar product (double contraction) between
+ tensors of rank 2.
+ <br>
+ (Scott Miller, 2013/08/14)
+ </li>
+
+ <li>
+ Fixed: Creating objects of type MappingQ was previously only possible
+ for low order polynomials. For orders higher than around 6, one ran
+ into assertions that tested for internal consistency. These assertions
+ have now been appropriately relaxes for the growth of round-off errors
+ with growing polynomial degrees.
+ <br>
+ (Juan Carlos Araujo Cabarcas, Wolfgang Bangerth, 2013/08/14)
+ </li>
+
+ <li>
+ New: MappingQEulerian is now also instantiated for vector elements
+ of type TrilinosWrappers::Vector as well as the MPI and block
+ variants.
+ <br>
+ (Armin Ghajar Jazi, 2013/08/14)
+ </li>
+
+ <li>
+ Fixed: The FiniteElement::face_to_cell_index() function had a bug
+ that made it work incorrectly for elements that have more than one
+ degree of freedom per line (in 2d) or per quad (in 3d). This is now
+ fixed for the most common cases, namely the FE_Q elements as well
+ as elements composed of FESystem elements. For all other cases, an
+ exception is generated reporting that this case is not implemented.
+ If you run into this, let us know.
+ <br>
+ (Wolfgang Bangerth, 2013/08/10)
+ </li>
+
+ <li>
+ New: DataOutBase::VtkFlags now has a flag
+ DataOutBase::VtkFlags::print_date_and_time that can be used to suppress output
+ of date and time in output files. This is useful in test suites where a newer
+ run at a different time produces differences against previously stored files,
+ even though the actual data is exactly the same.
+ <br>
+ (Oleh Krehel, 2013/08/06)
+ </li>
+
+ <li>
+ Fixed: The various block matrix classes are all derived from BlockMatrixBase
+ which had race conditions when the set() or add() functions were called from
+ different threads. This is now fixed.
+ <br>
+ (Wolfgang Bangerth, 2013/08/05)
+ </li>
+
+ <li>
+ Fixed: various fixes with assignment and reinit of PETScWrappers::MPI::Vector.
+ <br>
+ (Timo Heister, 2013/08/05)
+ </li>
+
+ <li>Fixed: An assertion wrongly triggered in
+ DoFTools::make_hanging_node_constraints when used with a particular
+ combination of FESystem elements containing FE_Nothing. This is now fixed.
+ <br>
+ (Denis Davydov, Wolfgang Bangerth, 2013/08/01)
+ </li>
+
+ <li>
+ New: Add has_ghost_elements() for PETScWrappers::MPI::BlockVector and
+ TrilinosWrappers::MPI::BlockVector.
+ <br>
+ (Timo Heister, 2013/08/01)
+ </li>
+
+ <li>
+ SparsityTools::distribute_sparsity_pattern did not work correctly for
+ block systems, this has been fixed (function has a different signature).
+ <br>
+ (Timo Heister, 2013/07/31)
+ </li>
+
+ <li>Fixed: When typing <code>make run</code> in the step-32 directory,
+ the program was executed with <code>mpirun -np 2 ./step-32</code>. This
+ assumes that a program <code>mpirun</code> exists, but also does that
+ deal.II was in fact compiled with MPI support on. Neither was intended.
+ This is now fixed.
+ <br>
+ (Wolfgang Bangerth, 2013/07/24)
+ </li>
+
+ <li>New: The DataOut, DataOutFaces, and DataOutRotation classes now allow
+ the output of data vectors using different DoFHandler objects (based on the
+ same triangulation), by new functions add_data_vector. This is used in the
+ step-31 tutorial program which avoids creating a joint DoFHandler just for
+ output.
+ <br>
+ (Martin Kronbichler, 2013/07/24)
+ </li>
+
+ <li>Changed: GridGenerator used to be a class with only static members
+ but is now a namespace, like all other similar constructs in deal.II.
+ <br>
+ (Wolfgang Bangerth, 2013/07/24)
+ </li>
+
+ <li>Changed: In GridGenerator, several functions had erroneously been changed
+ to take an argument of type <code>size_type</code> rather than <code>unsigned
+ int</code>. <code>GridGenerator::size_type</code> was a typedef to
+ types::global_dof_index, which for most users was <code>unsigned int</code>
+ anyway, but could also be set to be a 64-bit integer type. In any case, the
+ change has been reverted and these functions take just a regular
+ <code>unsigned int</code> again.
+ <br>
+ (Wolfgang Bangerth, 2013/07/24)
+ </li>
+</ol>
+
+
+*/
// ---------------------------------------------------------------------
/**
-// * @page changes_after_8_0 Changes after Version 8.0
+// * @page changes_after_8_1 Changes after Version 8.1
<p>
This is the list of changes made after the release of
</p>
<ol>
- <li>Changed: During the implementation of the 64-bit features for deal.II
- 8.0, many linear algebra classes obtained a local typedef
- <code>size_type</code> indicating the integer type that is used to index
- into them. In some instances, this was accidentally set to
- <code>types::global_dof_index</code> (which may be a 64-bit data type)
- even in cases where this is clearly not going to work, for example for
- FullMatrix::size_type, since we will not be able to store full matrix
- objects of sizes for which a 32-bit index type is not sufficient. In
- these cases, the typedef was reverted to just <code>unsigned int</code>.
- <br>
- (Wolfgang Bangerth, 2013/12/04)
- </li>
-
- <li> Removed: With the switch of the testsuite to CMake, the old report_features
- and build test facilities are removed.
- <br>
- (Matthias Maier, 2013/12/03)
- </li>
-
- <li>
- Changed: The kinds of template arguments for the VectorTools::interpolate
- function taking a Mapping as first argument has changed. This was done to
- work around a bug in the Intel ICC compiler which led to linker errors. Since
- the actual function argument list remains unchanged, the only way you will
- notice this change is if you <i>explicitly</i> specify template arguments.
- The only place one would typically do that is if you take the address of
- a template function. Since this is not a common operation, the impact of this
- change is probably limited.
- <br>
- (Wolfgang Bangerth, 2013/11/27)
- </li>
-
- <li>
- Changed: The ghost handling of the parallel::distributed::Vector class has
- been reworked: The vector now carries a global state that stores whether
- ghost elements have been updated or not. If a vector has ghost elements, it
- does not allow calls to compress() any more. Instead, a compress operation
- can now only be done when the ghost entries have been cleared before by
- calling zero_out_ghosts() or operator=0. The state can be queried by the new
- method has_ghost_elements(). This change avoids spurious entries to be
- inserted with compress(), but requires some change in user codes. The
- behavior of a ghosted vector is now very similar to ghosted PETSc and
- Trilinos vectors. The only difference is that the <i>same</i> vector can
- also be used as a non-ghosted vector which is designed for use in assembly
- routines.
- <br>
- (Martin Kronbichler, 2013/10/18)
- </li>
-
- <li>
- Removed: GridTools::collect_periodic_face_pairs. This function is superseded
- by GridTools::collect_periodic_faces which exports an
- std::vector<PeriodicFacepair<...>> instead.
- <br>
- (Matthias Maier, 2013/09/30)
- </li>
-
- <li>
- Removed: The member function face_to_equivalent_cell_index() in
- FiniteElementData has been removed. It had been deprecated a while
- back already. Please use FiniteElement::face_to_cell_index() instead.
- <br>
- (Wolfgang Bangerth, 2013/08/09)
- </li>
-
- <li>
- Changed: The typedefs DataOut::cell_iterator and
- DataOut::active_cell_iterator were previously defined as
- DoFHandler::(active)_cell_iterator, while they are now
- Triangulation::(active)_cell_iterator. This is necessary to support DataOut
- on multiple DoFHandler objects. This affects possible overloading of
- DataOut::next_cell(cell_iterator). Use the typedef
- DataOut::(active)_cell_iterator as argument type instead.
- <br>
- (Martin Kronbichler, 2013/07/24)
- </li>
</ol>
<ol>
- <li> Improved: The build system now supports usage of the library
- out of the build directory without prior installation. This is done by
- exporting an additional project configuration just for the build directory.
- Furthermore, a bunch of convenience targets get now defined that just build
- individual components (such as just the documentation or the libraries), and
- if <tt>CMAKE_INSTALL_PREFIX</tt> is set, also install that specific component.
- <br>
- (Matthias Maier, Luca Heltai, 2013/12/03)
- </li>
-
- <li> Fixed: Missing instantiations of SparseDirectMUMPS have been added.
- <br>
- (Timo Heister, 2013/11/25)
- </li>
-
- <li> New: introduced "make test" that runs a minimal set of tests. We
- encourage every user to run this, especially if they run in to problems.
- The tests are automatically picked depending on the configuration and
- will be shipped with every release.
- <br>
- (Timo Heister, Matthias Maier, 2013/11/08)
- </li>
-
- <li> Changed: It is now possible to restore a parallel Triangulation
- (and solutions) with a different number of processors it was saved with
- using Triangulation::save() and Triangulation::load().
- <br>
- (Timo Heister, 2013/11/02)
- </li>
-
- <li> Added support for Windows: It is now possible again to use gcc on Windows
- in order to compile the library. We support gcc-4.8.1 on Cygwin64 and MinGW-w64.
- <br>
- (Matthias Maier, 2013/11/01)
- </li>
-
- <li> Changed: step-9, step-13 and step-14 have been converted to use the
- more modern WorkStream concept for assembling linear systems and computing
- error indicators in parallel.
- <br>
- (Bruno Turcksin, Wolfgang Bangerth, 2013/10/26)
- </li>
-
- <li> New: The testsuite is now ported to <a href="http://www.cmake.org/">
- CMake</a> and uses CTest as test driver.
- <br>
- (Wolfgang Bangerth, Timo Heister, Matthias Maier, Bruno Turcksin, 2013/10/20)
- </li>
-
- <li>
- Changed: multithreadinfo::n_default_threads is now deprecated. Use the
- new n_threads() function instead, which works correctly with TBB.
- <br>
- (Timo Heister, 2013/10/02)
- </li>
-
- <li>
- Changed: if configured with TBB but the number of threads is set to 1,
- do not bother to use TBB in workstream.
- <br>
- (Timo Heister, 2013/10/02)
- </li>
-
- <li>
- New: step-51 demonstrates the use of hybridized discontinuous Galerkin
- methods in deal.II, using the face elements FE_FaceQ. The programs solves a
- scalar convection-diffusion equation.
- <br>
- (Martin Kronbichler and Scott Miller, 2013/10/01)
- </li>
-
- <li>
- New: There is now an element FE_FaceP that can be combined with FE_DGP in
- hybridized DG methods.
- <br>
- (Martin Kronbichler, 2013/09/17)
- </li>
-
- <li>
- Fixed: The DataOutBase::XDMFEntry class now has a proper serialization
- function to allow for checkpointing.
- <br>
- (Eric Heien, 2013/09/27)
- </li>
-
- <li>
- New: DataOutBase::DataOutFilter provides a way to remove duplicate vertices
- and values from a solution vector when generating output. Currently it only
- supports HDF5/XDMF output.
- <br>
- (Eric Heien, 2013/09/27)
- </li>
-
- <li>
- Removed: DataOutBase::HDF5MemStream was removed and the functionality replaced
- by DataOutBase::DataOutFilter. The user only manipulates these through
- DataOutBase::write_hdf5_parallel so this change should be transparent.
- <br>
- (Eric Heien, 2013/09/27)
- </li>
-
- <li>
- New: Like the usual DoFHandler class, the hp::DoFHandler class now also
- has a cache that makes operations such as <code>cell-@>get_dof_indices(...)</code>
- faster. This should accelerate many parts of the library that deal with
- hp finite elements.
- <br>
- (Wolfgang Bangerth, 2013/09/10)
- </li>
-
- <li>
- New: parallel::distributed::Triangulation now supports periodic boundaries.
- DoFTools::make_periodicity_constraints and similar functions are now working
- on parallel::distributed::Triangulation objects.
- <br>
- (Tobin Isaac, Craig Michoski, Daniel Arndt, 2013/09/06)
- </li>
-
- <li>
- New: It is now possible to compile and link deal.II against LLVM's libcxx. For
- this, a few issues with C++ standard violations are resolved.
- <br>
- (Matthias Maier, 2013/08/09)
- </li>
</ol>
<h3>Specific improvements</h3>
<ol>
- <li> Fixed: Several functions in namespace GridTools were not instantiated
- for parallel::distributed::Triangulation objects. This is now fixed.
- <br>
- (Denis Davydov, Wolfgang Bangerth, 2013/12/01)
- </li>
-
- <li> Improved: The methods ConstraintMatrix::distribute_local_to_global
- now use scratch data that is private to each thread instead of allocating
- it for every cell anew. This gives better performance, in particular in
- parallel, of these operations, while maintaining thread-safety (when
- accessing non-overlapping rows, no race condition can exist).
- <br>
- (Martin Kronbichler, 2013/12/03)
- </li>
-
- <li> Improved: When attempting operations such as FEValues::get_function_values()
- or FEValues::shape_value(), the FEValues object needs to know that what these
- functions return has been computed previously. What is computed is specified
- by the update flags that are passed to the constructor of all FEValues, FEFaceValues
- and FESubfaceValues objects. If a user attempts an operation for which the
- corresponding flag was not specified, an exception is generated. This exception
- did say previously what the cause was, but it was not overly explicit.
- The exception now generates a message that says exactly what is going wrong.
- <br>
- (Wolfgang Bangerth, 2013/12/01)
- </li>
-
- <li> Fixed: GridGenerator::truncated_cone() failed if half_length < 0.5*radius in 3d.
- <br>
- (Timo Heister, 2013/11/25)
- </li>
-
- <li> Fixed: make_hanging_node_constraints failed with an exception in a
- parallel::distributed computation if the element is
- RaviartThomas (and probably others).
- <br>
- (Timo Heister, 2013/11/23)
- </li>
-
- <li> Improved: CMake: Added a configuration check for incompatible ninja
- + icc setup, fixed several setup and performance issues with the
- testsuite.
- <br>
- (Matthias Maier, 2013/11/20)
- </li>
-
- <li> Changed: when a dealii::Exception is thrown, defer the symbol lookup of the
- stack trace to when it is needed. This improves performance if what() is never
- called.
- <br>
- (Timo Heister, 2013/11/17)
- </li>
-
- <li> Fixed: GridGenerator::parallelogram was not instantiated properly
- when using intel compilers.
- <br>
- (Timo Heister, 2013/11/17)
- </li>
-
- <li>
- Fixed: MappingQ1::transform_real_to_unit_cell() could fail in some
- cases with very elongated and twisted cells. This should now be fixed
- with an algorithm that uses a better method of computing the Newton
- convergence.
- <br>
- (Wolfgang Bangerth, 2013/11/17)
- </li>
-
- <li>
- Fixed: VectorTools::compute_no_normal_flux_constraints had a bug that
- only appeared in rare cases at vertices of the domain if one adjacent
- cell had two boundary indicators selected for no normal flux and another
- had only one. This is now fixed.
- <br>
- (Wolfgang Bangerth, 2013/11/17)
- </li>
-
- <li> Fixed: dealii::FETools::interpolation_difference was
- not working for TrilinosWrappers::MPI::Vectors with ghost
- entries. The TrilinosWrappers::VectorBase class has now a
- get_mpi_communicator method similar to the PETSc vector
- classes.
- <br>
- (Martin Steigemann, Martin Kronbichler, 2013/11/17)
- </li>
-
- <li> Fixed: Bundled fparser is now compiled with FP_USE_THREAD_SAFE_EVAL in
- case of enabled threading support so that it is thread safe.
- <br>
- (Matthias Maier, reported by Francesco Cattoglio 2013/11/16)
- </li>
-
- <li> Fixed: The CellData class now has a default constructor that
- sets the material and boundary indicators to zero. This fixes certain
- internal errors with the Intel ICC compiler.
- <br>
- (Wolfgang Bangerth, 2013/11/13)
- </li>
-
- <li> Cleanup: Removed obsolete files and files with unknown licensing
- status from the source tree. Along the way, parameter_gui now uses
- default icons from the desktop environment instead of bundled ones.
- <br>
- (Matthias Maier, 2013/11/11)
- </li>
-
- <li> New: There is now a framework for coloring graphs, with functions
- in namespace GraphColoring.
- <br>
- (Bruno Turcksin, Martin Kronbichler, 2013/11/06)
- </li>
-
- <li>
- Fixed: the DerivativeApproximation class was not working correctly when
- used with parallel vectors.
- (Timo Heister, 2013/10/28)
- </li>
-
- <li>
- ~Subscriptor and ~GrowingVectorMemory no longer throw an exception (the
- former if disable_abort_on_exception was called) to be compatible with the
- C++11 standard which otherwise requires the program to immediately call
- std::terminate. This was done with a new macro "AssertNothrow".
- <br>
- (Wolfgang Bangerth, Matthias Maier, Bruno Turcksin 2013/10/22)
- </li>
-
- <li>
- dealii::SolverControl::NoConvergence now inherits dealii::ExceptionBase and
- is thrown via AssertThrow(false, ... ).
- <br>
- (Matthias Maier, 2013/10/20)
- </li>
-
- <li>
- New: parallel::distributed::BlockVector has now methods update_ghost_values,
- compress, zero_out_ghosts, and has_ghost_elements that do the respective
- operation on each block of parallel::distributed::Vector.
- <br>
- (Martin Kronbichler, 2013/10/18)
- </li>
-
- <li>
- Fixed: When deriving from DataOut to filter the cells where output is generated, there were two different bugs that result in segmentation faults or wrong cells written (example, step-18).
- <br>
- (Timo Heister, 2013/10/16)
- </li>
-
- <li>
- New: GridIn::read_vtk() reads 2d and 3d meshes in VTK format.
- <br>
- (Mayank Sabharwal, Andreas Putz, 2013/10/07)
- </li>
-
- <li>
- Fixed: ConstraintMatrix would not compress() the IndexSet in the constructor
- leading to crashes that only happen in release mode. This is now fixed.
- <br>
- (Timo Heister, 2013/09/27)
- </li>
-
- <li>
- Fixed: PetscWrappers::MatrixBase::row_length() no longer worked after recent changes
- to PETSc (around PETSc release 3.4). This is now fixed.
- <br>
- (Wolfgang Bangerth, 2013/09/24)
- </li>
-
- <li>
- New: Added write_visit_record that allows writing .visit files with multiple blocks
- and multiple time steps.
- <br>
- (Fahad Alrashed, 2013/09/21)
- </li>
-
- <li>
- Changed: GridTools::have_same_coarse_mesh was only instantiated for
- MGDoFHandler arguments in debug mode. This is now fixed.
- <br>
- (Timo Heister, 2013/09/20)
- </li>
-
- <li>
- Changed: GridTools::find_active_cell_around_point now throws the exception
- GridTools::ExcPointNotFound
- if the point is outside the Triangulation. This exception can be caught.
- <br>
- (Timo Heister, 2013/09/18)
- </li>
-
- <li>
- Changed: we now call MPI_Init_thread instead of MPI_Init.
- <br>
- (Timo Heister, 2013/09/17)
- </li>
-
- <li>
- Enhancement: It is now possible to use the build directory directly without
- the need to install first. For this, a second copy of all necessary project
- configuration files (deal.IIConfig.cmake, ..., Make.global_options) are
- generated and deployed in the build directory. (This is fully compatible with
- the old possibility to install into the build dir.)
- <br>
- (Matthias Maier, 2013/09/15)
- </li>
-
- <li>
- Fixed: DoFTools::extract_locally_*_dofs now instantiated for hp::DofHandler.
- <br>
- (Jean-Paul Pelteret, 2013/09/11)
- </li>
-
- <li>
- Changed: distributed::parallel:BlockVector::operator= now allows importing
- of ghost values like all other vector types. Also added some new constructors
- for BlockVector and Vector using IndexSets to mirror the other linear algebra
- classes.
- <br>
- (Timo Heister, 2013/09/04)
- </li>
-
- <li>
- Fixed: VectorTools::compute_no_normal_flux_constraints had a bug that
- only manifested on complex meshes. This is now fixed.
- <br>
- (Chih-Che Chueh, Wolfgang Bangerth, 2013/09/04)
- </li>
-
- <li>
- New: All vector classes now have functions <code>extract_subvector_to()</code>
- that allow extracting not just a single value but a whole set.
- <br>
- (Fahad Alrashed, 2013/09/02)
- </li>
-
- <li>
- Fixed: <code>common/Make.global_options</code> now exports enable-threads
- correctly, furthermore, <code>lib-suffix</code>, <code>shared-lib-suffix</code>
- and <code>static-lib-suffix</code> are now exported as well for better legacy
- support.
- <br>
- (Matthias Maier, 2013/08/30)
- </li>
-
- <li>
- New: The ParameterHandler class can now deal with including one parameter
- file from another.
- <br>
- (Wolfgang Bangerth, 2013/08/25)
- </li>
-
- <li>
- New: The method VectorTools::compute_normal_flux_constraints can be used to
- force a vector finite element function to be normal to the boundary.
- <br>
- (Martin Kronbichler, 2013/08/23)
- </li>
-
- <li>
- Improved: MappingQ now uses the points of the Gauss-Lobatto quadrature
- formula as support points instead of equispaced ones. This allows its use
- for high polynomial orders and also gives better interpolation of circular
- boundaries. Beware that mappings of order three and higher will behave
- slightly differently now (usually better).
- <br>
- (Martin Kronbichler, 2013/08/23)
- </li>
-
- <li>
- Improved: Several .cc files in the deal.II directory have been split in
- order to better utilize multiple processors when compiling in parallel and
- reduce memory requirements of the compilation stage.
- <br>
- (Martin Kronbichler, 2013/08/22)
- </li>
-
- <li>
- Fixed: The ParameterHandler::declare_entry() did not check that the
- default value of a parameter indeed satisfies the pattern given for this
- parameter (despite a statement in the documentation that this checking
- would happen). This is now fixed.
- <br>
- (Wolfgang Bangerth, 2013/08/21)
- </li>
-
- <li>
- New: Patterns::List and Patterns::Map now accept a string
- different than the default comma that denotes the separator
- between entries of the list or map.
- <br>
- (Wolfgang Bangerth, 2013/08/21)
- </li>
-
- <li>
- Fixed: Some operations in the MappingQ class are now done in higher
- precision arithmetic to mitigate the ill-conditioning that appears
- when using mappings of high order (say, order 6 or 8 or 10).
- <br>
- (Juan Carlos Araujo Cabarcas, 2013/08/20)
- </li>
-
- <li>
- Fixed: The SLEPcWrappers classes could not be compiled for 64-bit
- indices. This is now fixed.
- <br>
- (Denis Davydov, Wolfgang Bangerth, 2013/08/20)
- </li>
-
- <li>
- Fixed: SolutionTransfer used to crash whenever one transfered in the hp
- context between cells that use FE_Nothing and FE_Q. This is now fixed.
- <br>
- (Krzyszof Bzowski, Wolfgang Bangerth, 2013/08/18)
- </li>
-
- <li>
- Fixed: Under some circumstances (see http://code.google.com/p/dealii/issues/detail?id=82)
- the DoFTools::make_periodicity_constraints() function could create cycles in
- the ConstraintMatrix object. This is now fixed.
- <br>
- (David Emerson, Wolfgang Bangerth, 2013/08/16)
- </li>
-
- <li>
- New: There is now a function ConstraintMatrix::are_identity_constrained().
- <br>
- (Wolfgang Bangerth, 2013/08/16)
- </li>
-
- <li>
- New: TableHandler::write_text() now also supports output in
- org-mode (http://orgmode.org/) format via a new entry in the
- TableHandler::TextOutputFormat enumeration.
- <br>
- (Oleh Krehel, 2013/08/15)
- </li>
-
- <li>
- New: There are now global functions <code>scalar_product</code>
- that compute the scalar product (double contraction) between
- tensors of rank 2.
- <br>
- (Scott Miller, 2013/08/14)
- </li>
-
- <li>
- Fixed: Creating objects of type MappingQ was previously only possible
- for low order polynomials. For orders higher than around 6, one ran
- into assertions that tested for internal consistency. These assertions
- have now been appropriately relaxes for the growth of round-off errors
- with growing polynomial degrees.
- <br>
- (Juan Carlos Araujo Cabarcas, Wolfgang Bangerth, 2013/08/14)
- </li>
-
- <li>
- New: MappingQEulerian is now also instantiated for vector elements
- of type TrilinosWrappers::Vector as well as the MPI and block
- variants.
- <br>
- (Armin Ghajar Jazi, 2013/08/14)
- </li>
-
- <li>
- Fixed: The FiniteElement::face_to_cell_index() function had a bug
- that made it work incorrectly for elements that have more than one
- degree of freedom per line (in 2d) or per quad (in 3d). This is now
- fixed for the most common cases, namely the FE_Q elements as well
- as elements composed of FESystem elements. For all other cases, an
- exception is generated reporting that this case is not implemented.
- If you run into this, let us know.
- <br>
- (Wolfgang Bangerth, 2013/08/10)
- </li>
-
- <li>
- New: DataOutBase::VtkFlags now has a flag
- DataOutBase::VtkFlags::print_date_and_time that can be used to suppress output
- of date and time in output files. This is useful in test suites where a newer
- run at a different time produces differences against previously stored files,
- even though the actual data is exactly the same.
- <br>
- (Oleh Krehel, 2013/08/06)
- </li>
-
- <li>
- Fixed: The various block matrix classes are all derived from BlockMatrixBase
- which had race conditions when the set() or add() functions were called from
- different threads. This is now fixed.
- <br>
- (Wolfgang Bangerth, 2013/08/05)
- </li>
-
- <li>
- Fixed: various fixes with assignment and reinit of PETScWrappers::MPI::Vector.
- <br>
- (Timo Heister, 2013/08/05)
- </li>
-
- <li>Fixed: An assertion wrongly triggered in
- DoFTools::make_hanging_node_constraints when used with a particular
- combination of FESystem elements containing FE_Nothing. This is now fixed.
- <br>
- (Denis Davydov, Wolfgang Bangerth, 2013/08/01)
- </li>
-
- <li>
- New: Add has_ghost_elements() for PETScWrappers::MPI::BlockVector and
- TrilinosWrappers::MPI::BlockVector.
- <br>
- (Timo Heister, 2013/08/01)
- </li>
-
- <li>
- SparsityTools::distribute_sparsity_pattern did not work correctly for
- block systems, this has been fixed (function has a different signature).
- <br>
- (Timo Heister, 2013/07/31)
- </li>
-
- <li>Fixed: When typing <code>make run</code> in the step-32 directory,
- the program was executed with <code>mpirun -np 2 ./step-32</code>. This
- assumes that a program <code>mpirun</code> exists, but also does that
- deal.II was in fact compiled with MPI support on. Neither was intended.
- This is now fixed.
- <br>
- (Wolfgang Bangerth, 2013/07/24)
- </li>
-
- <li>New: The DataOut, DataOutFaces, and DataOutRotation classes now allow
- the output of data vectors using different DoFHandler objects (based on the
- same triangulation), by new functions add_data_vector. This is used in the
- step-31 tutorial program which avoids creating a joint DoFHandler just for
- output.
- <br>
- (Martin Kronbichler, 2013/07/24)
- </li>
-
- <li>Changed: GridGenerator used to be a class with only static members
- but is now a namespace, like all other similar constructs in deal.II.
- <br>
- (Wolfgang Bangerth, 2013/07/24)
- </li>
-
- <li>Changed: In GridGenerator, several functions had erroneously been changed
- to take an argument of type <code>size_type</code> rather than <code>unsigned
- int</code>. <code>GridGenerator::size_type</code> was a typedef to
- types::global_dof_index, which for most users was <code>unsigned int</code>
- anyway, but could also be set to be a 64-bit integer type. In any case, the
- change has been reverted and these functions take just a regular
- <code>unsigned int</code> again.
- <br>
- (Wolfgang Bangerth, 2013/07/24)
- </li>
</ol>
projects / dealii.git / commitdiff