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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

Unreleased

Fixed

  • fix inline definition of logging_level_to_string

[0.9.0] - 2024-09-19

Added

  • The old implementation of HMatrix was mixing the distributed operations and compression via hierarchical matrices. This is fixed by replacing HMatrix by:
    • DistributedOperator which contains a list of local operators and implements all the distributed operations,
    • VirtualLocalOperator which is the interface local operators must satisfy,
    • LocalDenseMatrix is an example of local operator consisting of a dense matrix Matrix,
    • and LocalHMatrix is an example of local operator consisting of a hierarchical matrix based on HMatrix (different from the previous HMatrix, see below).
  • Utility classes that help build DistributedOperator and DDM objects are available, for example: DefaultApproximationBuilder and DDMSolverBuilder. They do all the wiring between the inner interfaces between Htool-DDM's objects, see include/htool/istributed_operator/utility.hpp and include/htool/solvers/utility.hpp.
  • Formatter has been added, see .clang_format.
  • A logger has been added with Logger. Its output can be customizerd via IObjectWriter.

Changed

  • HMatrix is now a class representing a hierarchical matrix without distributed-memory parallelism (note that it can still use shared-memory parallelism):
    • It inherits from TreeNode, and it provides the algebra related to hierarchical matrices via free functions:
      • product with vector and matrix (threaded with OpenMP),
      • and with this new version, LU and Cholesky factorization (not threaded yet, WIP).
    • The algorithms for building the block cluster tree is contained in HMatrixTreeBuilder. Users can provide their own "factory".
  • VirtualCluster is removed and the clustering part of the library has been rewritten:
    • Cluster now derives from TreeNode, whose template parameter corresponds to the precision of cluster nodes' radius and centre (previously only double).
    • Standards recursive build algorithms are provided via ClusterTreeBuilder. Users can provide their own "factory".
    • ClusterTreeBuilder is a class template and uses the policy pattern (a policy for computing direction, and another for splitting along the direction).
  • DDM has been modified, one-level and two-level preconditioners can be customized now via VirtualLocalSolver, VirtualCoarseSpaceBuilder and VirtualCoarseOperatorBuilder.
    • Three one-level preconditioners are provided by Htool-DDM via DDMSolverBuilder:
      • block-jacobi with a local HMatrix
      • a DDM preconditioner where the local subdomain with overlap uses one HMatrix
      • a DDM preconditioner where the local subdomain with overlap uses one HMatrix for the local subdomain without overlap, and dense matrices for the overlap and its interaction with the subdomain without overlap.
    • A second-level (GenEO coarse space) is provided with GeneoCoarseSpaceDenseBuilder and GeneoCoarseOperatorBuilder.

Removed

  • multilrmat and multihmatrix are removed.

[0.8.1] - 2023-05-26

Added

  • set_delay_dense_computation to HMatrix
  • clustering with user partition requiring permutation

Changed

  • improved CI with stricter flags
  • moved version number definition from misc/define.hpp to htool_version.hpp

Fixed

  • Fix const-correctness for g++ 4.8.5
  • Fix compatibility with c++20
  • Fix MPI data type for complex float and double
  • Fix issue with default MPI communicator

[0.8] - 2022-01-27

Added

  • doxygen documentation
  • mvprod_transp_global_to_global and mvprod_transp_local_to_local added to VirtualHMatrix
  • getters for clusters in VirtualHMatrix
  • custom gmv in ddm

Changed

Fixed

  • Corner case with ACA resolved (first row/column only contains zeroes)
  • Warnings from fujitsu compilers because of last line
  • bug when using threading in mvprod

[0.7] - 2021-09-21

Added

  • CMakefile checks consistency of version number across git/c++/CMake
  • Test for warnings coming from include/htool/*
  • Coverage added
  • Methods in ddm interface to get local numbering
  • VirtualLowRankGenerator and VirtualAdmissibilityCondition added for better modularity

Changed

  • Remove unnecessary arguments in HMatrix and cluster interfaces
  • MultiHMatrix deprecated for the moment (everything related to this in htool/multi)

Fixed

  • Missing inlines added
  • Fix bug when using htool via petsc with mkl

[0.6] - 2021-08-03

Changed

  • Python interface with ctypes deprecated, see new python interface with pybind11.
  • Performance tests removed, see dedicated repository.
  • GUI deprecated.

[0.5] - 2021-08-03

Added

  • Interface for clustering via VirtualCluster, implementation with Cluster whose template parameter is the type of clustering (supported now: PCARegularClustering, PCAGeometricClustering, BoundingBox1RegularClustering and BoundingBoxGeometricClustering).
  • Interface for hmatrix objects via VirtualHMatrix, implementation with HMatrix whose template parameter is the type of compressor (supported now: SVD, fullACA, partialACA, sympartialACA, all derived from abstract class LowRankMatrix).
  • Interface for generator via VirtualGenerator. The user needs to define an object deriving from VirtualGenerator to populate a hmatrix.
  • Block class with different admissible condition used in Block (only RjasanowSteinbach at the moment).
  • Interface for a sub-block via IMatrix, from which both SubMatrix and LowRankMatrix inherit. They respectively correspond to dense and compressed sub-blocks.
  • DDM solvers via HPDDM, and coarse space building.
  • Test suite and CI with GitHub action.