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@tcojean tcojean released this 23 Aug 17:04
· 2849 commits to master since this release
v1.4.0
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Learn about vigilant mode.

The Ginkgo team is proud to announce the new Ginkgo minor release 1.4.0. This
release brings most of the Ginkgo functionality to the Intel DPC++ ecosystem
which enables Intel-GPU and CPU execution. The only Ginkgo features which have
not been ported yet are some preconditioners.

Ginkgo's mixed-precision support is greatly enhanced thanks to:

  1. The new Accessor concept, which allows writing kernels featuring on-the-fly
    memory compression, among other features. The accessor can be used as
    header-only, see the accessor BLAS benchmarks repository as a usage example.
  2. All LinOps now transparently support mixed-precision execution. By default,
    this is done through a temporary copy which may have a performance impact but
    already allows mixed-precision research.

Native mixed-precision ELL kernels are implemented which do not see this cost.
The accessor is also leveraged in a new CB-GMRES solver which allows for
performance improvements by compressing the Krylov basis vectors. Many other
features have been added to Ginkgo, such as reordering support, a new IDR
solver, Incomplete Cholesky preconditioner, matrix assembly support (only CPU
for now), machine topology information, and more!

Supported systems and requirements:

  • For all platforms, cmake 3.13+
  • C++14 compliant compiler
  • Linux and MacOS
    • gcc: 5.3+, 6.3+, 7.3+, all versions after 8.1+
    • clang: 3.9+
    • Intel compiler: 2018+
    • Apple LLVM: 8.0+
    • CUDA module: CUDA 9.0+
    • HIP module: ROCm 3.5+
    • DPC++ module: Intel OneAPI 2021.3. Set the CXX compiler to dpcpp.
  • Windows
    • MinGW and Cygwin: gcc 5.3+, 6.3+, 7.3+, all versions after 8.1+
    • Microsoft Visual Studio: VS 2019
    • CUDA module: CUDA 9.0+, Microsoft Visual Studio
    • OpenMP module: MinGW or Cygwin.

Algorithm and important feature additions:

  • Add a new DPC++ Executor for SYCL execution and other base utilities
    #648, #661, #757, #832
  • Port matrix formats, solvers and related kernels to DPC++. For some kernels,
    also make use of a shared kernel implementation for all executors (except
    Reference). #710, #799, #779, #733, #844, #843, #789, #845, #849, #855, #856
  • Add accessors which allow multi-precision kernels, among other things.
    #643, #708
  • Add support for mixed precision operations through apply in all LinOps. #677
  • Add incomplete Cholesky factorizations and preconditioners as well as some
    improvements to ILU. #672, #837, #846
  • Add an AMGX implementation and kernels on all devices but DPC++.
    #528, #695, #860
  • Add a new mixed-precision capability solver, Compressed Basis GMRES
    (CB-GMRES). #693, #763
  • Add the IDR(s) solver. #620
  • Add a new fixed-size block CSR matrix format (for the Reference executor).
    #671, #730
  • Add native mixed-precision support to the ELL format. #717, #780
  • Add Reverse Cuthill-McKee reordering #500, #649
  • Add matrix assembly support on CPUs. #644
  • Extends ISAI from triangular to general and spd matrices. #690

Other additions:

  • Add the possibility to apply real matrices to complex vectors.
    #655, #658
  • Add functions to compute the absolute of a matrix format. #636
  • Add symmetric permutation and improve existing permutations.
    #684, #657, #663
  • Add a MachineTopology class with HWLOC support #554, #697
  • Add an implicit residual norm criterion. #702, #818, #850
  • Row-major accessor is generalized to more than 2 dimensions and a new
    "block column-major" accessor has been added. #707
  • Add an heat equation example. #698, #706
  • Add ccache support in CMake and CI. #725, #739
  • Allow tuning and benchmarking variables non intrusively. #692
  • Add triangular solver benchmark #664
  • Add benchmarks for BLAS operations #772, #829
  • Add support for different precisions and consistent index types in benchmarks.
    #675, #828
  • Add a Github bot system to facilitate development and PR management.
    #667, #674, #689, #853
  • Add Intel (DPC++) CI support and enable CI on HPC systems. #736, #751, #781
  • Add ssh debugging for Github Actions CI. #749
  • Add pipeline segmentation for better CI speed. #737

Changes:

  • Add a Scalar Jacobi specialization and kernels. #808, #834, #854
  • Add implicit residual log for solvers and benchmarks. #714
  • Change handling of the conjugate in the dense dot product. #755
  • Improved Dense stride handling. #774
  • Multiple improvements to the OpenMP kernels performance, including COO,
    an exclusive prefix sum, and more. #703, #765, #740
  • Allow specialization of submatrix and other dense creation functions in solvers. #718
  • Improved Identity constructor and treatment of rectangular matrices. #646
  • Allow CUDA/HIP executors to select allocation mode. #758
  • Check if executors share the same memory. #670
  • Improve test install and smoke testing support. #721
  • Update the JOSS paper citation and add publications in the documentation.
    #629, #724
  • Improve the version output. #806
  • Add some utilities for dim and span. #821
  • Improved solver and preconditioner benchmarks. #660
  • Improve benchmark timing and output. #669, #791, #801, #812

Fixes:

  • Sorting fix for the Jacobi preconditioner. #659
  • Also log the first residual norm in CGS #735
  • Fix BiCG and HIP CSR to work with complex matrices. #651
  • Fix Coo SpMV on strided vectors. #807
  • Fix segfault of extract_diagonal, add short-and-fat test. #769
  • Fix device_reset issue by moving counter/mutex to device. #810
  • Fix EnableLogging superclass. #841
  • Support ROCm 4.1.x and breaking HIP_PLATFORM changes. #726
  • Decreased test size for a few device tests. #742
  • Fix multiple issues with our CMake HIP and RPATH setup.
    #712, #745, #709
  • Cleanup our CMake installation step. #713
  • Various simplification and fixes to the Windows CMake setup. #720, #785
  • Simplify third-party integration. #786
  • Improve Ginkgo device arch flags management. #696
  • Other fixes and improvements to the CMake setup.
    #685, #792, #705, #836
  • Clarification of dense norm documentation #784
  • Various development tools fixes and improvements #738, #830, #840
  • Make multiple operators/constructors explicit. #650, #761
  • Fix some issues, memory leaks and warnings found by MSVC.
    #666, #731
  • Improved solver memory estimates and consistent iteration counts #691
  • Various logger improvements and fixes #728, #743, #754
  • Fix for ForwardIterator requirements in iterator_factory. #665
  • Various benchmark fixes. #647, #673, #722
  • Various CI fixes and improvements. #642, #641, #795, #783, #793, #852
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