Issues

• Roadmap: open-issue priority

  RallypointOne/MatrixFreeOperators.jl#109 · Filter by author kylebeggs opened on Sep 30, 2026

• test(ad): re-enable Enzyme gradient tests skipped on Julia 1.13

  enhancement
  RallypointOne/MatrixFreeOperators.jl#108 · Filter by author kylebeggs opened on Sep 30, 2026

• perf(amr): source-centric transposed CSR for the coarse–fine fill adjoint

  performance
  RallypointOne/MatrixFreeOperators.jl#94 · Filter by author kylebeggs opened on Sep 10, 2026

• perf(forest): thread the reference BlockForest path — leaf sweeps and exchange descriptor loops

  performance
  Task

  RallypointOne/MatrixFreeOperators.jl#83 · Filter by author kylebeggs opened on Sep 9, 2026

• meta(ad): Enzyme coverage — operator pullbacks, packed/GPU parity, Julia 1.13

  enhancement
  Task

  RallypointOne/MatrixFreeOperators.jl#82 · Filter by author kylebeggs opened on Sep 9, 2026

• meta(sciml): expose prepared operators to the SciML integrator stack

  enhancement
  Feature

  RallypointOne/MatrixFreeOperators.jl#81 · Filter by author kylebeggs opened on Sep 9, 2026
  1

• meta(grids): non-box domains and richer boundary conditions — geometry seam, mask, Robin, tensor diffusion

  enhancement
  Feature

  RallypointOne/MatrixFreeOperators.jl#80 · Filter by author kylebeggs opened on Sep 9, 2026

• meta(distributed): multi-node and multi-GPU execution — backend API, IGG halo, tests, slab adjoint

  enhancement
  Feature

  RallypointOne/MatrixFreeOperators.jl#79 · Filter by author kylebeggs opened on Sep 9, 2026

• perf(amr): batch the coarse-fine flux rewrite into one device launch for packed Diffusion

  performance
  RallypointOne/MatrixFreeOperators.jl#78 · Filter by author kylebeggs opened on Sep 8, 2026

• feat(sciml): expose operators as (Split)ODEFunction and search integrators per model

  enhancement
  RallypointOne/MatrixFreeOperators.jl#73 · Filter by author kylebeggs opened on Aug 14, 2026

• feat(amr): regrid cadence + buffer zone so a forest can be reused across timesteps

  enhancement
  RallypointOne/MatrixFreeOperators.jl#72 · Filter by author kylebeggs opened on Aug 14, 2026

• feat(operators): anisotropic diffusion ∇·(D∇u) with a full tensor D

  enhancement
  RallypointOne/MatrixFreeOperators.jl#70 · Filter by author kylebeggs opened on Aug 14, 2026
  1

• design(grids): pick the non-box geometry seam — staircase mask vs phase-field vs Shortley–Weller

  question
  RallypointOne/MatrixFreeOperators.jl#69 · Filter by author kylebeggs opened on Aug 14, 2026
  1

• feat(sciml): build the planned SciMLOperators jac_prototype adapter (DESIGN §7)

  enhancement
  RallypointOne/MatrixFreeOperators.jl#65 · Filter by author kylebeggs opened on Aug 14, 2026

• feat(operators): stacked multi-field operator with cross-component coupling

  enhancement
  RallypointOne/MatrixFreeOperators.jl#63 · Filter by author kylebeggs opened on Aug 14, 2026
  1

• feat(boundaries): Robin BC (a·u + b·∂u/∂n = c)

  enhancement
  RallypointOne/MatrixFreeOperators.jl#62 · Filter by author kylebeggs opened on Aug 14, 2026
  1

• feat(grids): active-cell mask so stencil operators can skip inactive cells

  enhancement
  RallypointOne/MatrixFreeOperators.jl#61 · Filter by author kylebeggs opened on Aug 14, 2026
  1

• feat(fv): FluxDivergence primitive — geometry accessors, adjoint inner product, conservative advection

  enhancement
  Feature

  RallypointOne/MatrixFreeOperators.jl#54 · Filter by author kylebeggs opened on Aug 13, 2026
  2

• perf(algebra): constant-fold affine time-step operators (α·I + β·Laplacian) into one stencil pass

  performance
  RallypointOne/MatrixFreeOperators.jl#52 · Filter by author kylebeggs opened on Aug 12, 2026

• meta(cpu): single-grid apply! throughput — threading (AK now in core) and stencil fusion

  performance
  Feature

  RallypointOne/MatrixFreeOperators.jl#51 · Filter by author kylebeggs opened on Aug 12, 2026
  1

• meta(amr): forest performance — the coarse–fine exchange, not regridding, is the AMR tax

  performance
  Task

  RallypointOne/MatrixFreeOperators.jl#49 · Filter by author kylebeggs opened on Aug 4, 2026

• feat(api): explicit distributed-backend selection (MDLABackend / IGGBackend), mirroring AbstractJVPBackend

  enhancement
  RallypointOne/MatrixFreeOperators.jl#47 · Filter by author kylebeggs opened on Aug 3, 2026

• feat(distributed): ImplicitGlobalGrid halo backend for multi-node CartesianGrid

  enhancement
  RallypointOne/MatrixFreeOperators.jl#46 · Filter by author kylebeggs opened on Aug 3, 2026
  2

• test(ad): GPU/packed-field AD parity for the exchange rules

  enhancement
  Task

  RallypointOne/MatrixFreeOperators.jl#43 · Filter by author kylebeggs opened on Jul 31, 2026

• feat(ad): linear-operator pullback rules (DESIGN §6) — re-verify against current Enzyme

  enhancement
  RallypointOne/MatrixFreeOperators.jl#41 · Filter by author kylebeggs opened on Jul 31, 2026