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grospelliergilles merged 1 commit into from
Oct 21, 2026
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Update changelog for version 4.2 of Arcane #2837

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127 changes: 127 additions & 0 deletions arcane/doc/doc_common/changelog.md
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Expand Up @@ -9,6 +9,132 @@ are listed here: \ref arcanedoc_news_changelog20

___

## Arcane Versions 4.2.3+ (October 2026)

### New Features/Improvements

- Adds support for providing the case file content directly to a standalone
launcher (\pr{2688}).
- Adds a mesh builder customization service and improves mesh-handle safety
(\pr{2825}).
- Adds views for multi-dimensional mesh variables and makes \arcane{NumVector}
and \arcane{NumMatrix} available in the public API (\pr{2684}, \pr{2685}).
- Moves numeric types and utilities, including \arcane{Real2}, \arcane{Real3},
\arcane{Real2x2}, \arcane{Real3x3}, \arcane{NumVector},
\arcane{NumMatrix} and \arcane{HPReal}, from %Arcane to %Arccore
(\pr{2689}, \pr{2690}, \pr{2691}, \pr{2692}, \pr{2699}).
- Improves \arcane{MDSpan} usage and numerical type support in arrays, including
`isNearlyEqual()` declarations and POD support (\pr{2683}, \pr{2693},
\pr{2694}, \pr{2700}, \pr{2701}).
- Renames the materials implementation namespace and performs additional
Arccore cleanup (\pr{2682}, \pr{2687}).
- Improves material constituent item vectors for GPU and multithreaded use
(\pr{2713}).
- Adds mesh cutting and section services (\pr{2711}).
- Adds a sample demonstrating degrees of freedom on cells (\pr{2714},
\pr{2715}).
- Adds standalone accelerator manager support for multithreaded use (\pr{2732}).
- Refactors and documents the Alina public API, adds a distributed solver API
sample/test, and improves its test coverage (\pr{2730}, \pr{2735},
\pr{2736}, \pr{2737}).
- Adds message-passing operations for exclusive scan, reductions with separate
send and receive buffers, and communicator splitting (\pr{2764},
\pr{2765}, \pr{2766}, \pr{2790}).
- Adds support for cloning variables in mesh section and cut services
and improves their tests and validation (\pr{2756}, \pr{2757}, \pr{2759}).
- Supports polygonal and polyhedral meshes in additional mesh and output paths,
including ghost layers, MED input and Ensight output (\pr{2731},
\pr{2754}, \pr{2755}, \pr{2788}, \pr{2794}, \pr{2797},
\pr{2800}, \pr{2802}, \pr{2808}, \pr{2809}).
- Improves the Alina solver API and builtin backend tests, and removes remaining
direct MPI dependencies from Alina (\pr{2702}, \pr{2703}, \pr{2704},
\pr{2705}, \pr{2708}, \pr{2726}, \pr{2729}, \pr{2739},
\pr{2740}, \pr{2741}, \pr{2742}, \pr{2750}, \pr{2763},
\pr{2786}, \pr{2787}, \pr{2791}, \pr{2792}, \pr{2795},
\pr{2796}, \pr{2805}, \pr{2807}, \pr{2813}, \pr{2821}).
- Improves array and multidimensional array APIs, including \arcane{SmallSpan}
and \arcane{MDSpan} interoperability (\pr{2721}, \pr{2743}, \pr{2748}).
- Adds ArcaNet parameter-file support and updates its format and reader
(\pr{2747}, \pr{2752}, \pr{2778}, \pr{2785}).
- Improves task APIs and replaces an initialization-time `std::set` use
(\pr{2734}, \pr{2774}).
- Adds views for \arcane{NumVector} mesh variables and `constexpr` geometric
generation methods (\pr{2798}, \pr{2799}).
- Adds conversion support for \arcane{NumVector} and \arcane{NumMatrix},
changes default initialization of numerical types, and avoids inserting zero
values in Aleph matrices (\pr{2782}, \pr{2783}, \pr{2784}).
- Updates standalone MPI manager initialization and adds a running-state query
for profiling services (\pr{2810}, \pr{2811}).
- Adds a mutex for selected writes to `std::cout` and `std::cerr` (\pr{2817}).
- Optimizes container initialization and radix-based compaction
(\pr{2833}, \pr{2834}).
- Adds support for polyhedrons in VTKHDF output (\pr{2830}).
- Enables HYPRE with mixed and big integer configurations in Alien
(\pr{2829}, \pr{2831}).

### Changes

- Removes the \arcane{ItemTypeMng} singleton and adds standalone item type
managers (\pr{2804}, \pr{2812}).
- Removes direct MPI message-passing manager usage from Arcane and moves the
MPI implementation behind internal interfaces (\pr{2775}, \pr{2776},
\pr{2780}, \pr{2781}, \pr{2793}).
- Replaces Boost implementations in Alina with internal alternatives and
reduces its dependency on Arcane (\pr{2724}, \pr{2725}, \pr{2729}).
- Uses \arcane{UniqueArray} in additional Alina code and improves its build
configuration (\pr{2726}, \pr{2750}).
- Moves `Directory` from Arcane to Arccore (\pr{2770}).
- Removes the Glib thread implementation (\pr{2820}).

### Corrections

- Fixes parallel HLLC tests, ghost-layer handling, and polyhedral ghost removal
(\pr{2695}, \pr{2696}, \pr{2797}, \pr{2809}).
- Fixes compilation with GCC 12, CUDA 12.4 and SWIG 4.5, Fortran builds, and
Windows DLL copying (\pr{2712}, \pr{2716}, \pr{2720}, \pr{2749},
\pr{2760}).
- Fixes long-long HDF5 types, stack-trace initialization, race conditions in
TBB, and solver reductions and sends (\pr{2738}, \pr{2762}, \pr{2772},
\pr{2789}, \pr{2815}).
- Fixes potential deadlocks and memory leaks in stack tracing and property-tree
handling (\pr{2818}, \pr{2819}).

### Internal

- Adds support for message-passing tracing and local-rank information in shared
memory communication (\pr{2767}, \pr{2814}, \pr{2816}).
- Improves cell serialization and polyhedral cell creation (\pr{2806},
\pr{2808}).
- Adds a context object for Alina solvers and preconditioners (\pr{2821}).
- Hides \arcane{MeshHandleRef} implementation and uses a sentinel for the end
iterator of \arcane{ItemLocalIdListView} (\pr{2822}, \pr{2823}).
- Improves mesh statistics construction and adds a service to customize mesh
building (\pr{2824}, \pr{2825}).
- Adds a HLLC test with an obstacle (\pr{2828}).

### Compilation and Continuous Integration (CI)

- Updates FlexLM discovery and Coverity workflow configuration (\pr{2681},
\pr{2706}).
- Removes obsolete IFPEN workflows and adds a required memory allocator header
(\pr{2697}, \pr{2707}).
- Updates Fortran, vcpkg, Windows, and app build-system workflows and support
(\pr{2709}, \pr{2745}, \pr{2746}, \pr{2753}, \pr{2761},
\pr{2773}).
- Adds contributor guidance and updates documentation generation for newer
Doxygen versions (\pr{2758}, \pr{2769}, \pr{2779}).
- Adds documentation for array views and spans, and removes an obsolete Aleph
matrix warning (\pr{2722}, \pr{2777}).
- Updates parameter-file and mesh element documentation, and adds a glossary
(\pr{2733}, \pr{2779}, \pr{2785}, \pr{2826}).
- Updates parameter-file documentation and corrects variable existence checks
in the documentation generator (\pr{2751}).
- Adds a missing header for accelerator kernel launching (\pr{2771}).
- Replaces TextTransform with Scriban for generating geometry classes
(\pr{2836}).

___

## Arcane Version 4.1.16.0 (July 8, 2026) {#arcanedoc_version410}

### New Features/Improvements
Expand Down Expand Up @@ -229,6 +355,7 @@ ___
thread-safe (\pr{2511}).
- Puts `ARCCORE_CXX_COMPILER_IS_GNU_OR_CLANG_BASED` in the CMake cache to
simplify configuration (\pr{2568}).

### Alien

- Updates default values with GMRES for PETSc (\pr{2251})
Expand Down
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