v4.2.6

What's Changed

• fix AMReX 25.03 CUDA archs export with reduced arch list by @jameslehoux in #264

Full Changelog: v4.2.5...v4.2.6

What's Changed

• fix AMReX 25.03 CUDA archs export with reduced arch list by @jameslehoux in #264

Full Changelog: v4.2.5...v4.2.6

v4.2.5

What's Changed

• strip _core.so explicitly to fight 3 GB GPU wheel bloat by @jameslehoux in #263

Full Changelog: v4.2.4...v4.2.5

What's Changed

• strip _core.so explicitly to fight 3 GB GPU wheel bloat by @jameslehoux in #263

Full Changelog: v4.2.4...v4.2.5

v4.2.4

What's Changed

• shrink GPU wheel under PyPI 320 MiB limit by @jameslehoux in #262

Full Changelog: v4.2.3...v4.2.4

What's Changed

• shrink GPU wheel under PyPI 320 MiB limit by @jameslehoux in #262

Full Changelog: v4.2.3...v4.2.4

v4.2.3

What's Changed

• fix GPU wheel: install upstream NVTX3 headers for CUDA 12 compat by @jameslehoux in #261

Full Changelog: v4.2.2...v4.2.3

What's Changed

• fix GPU wheel: install upstream NVTX3 headers for CUDA 12 compat by @jameslehoux in #261

Full Changelog: v4.2.2...v4.2.3

v4.2.2

What's Changed

• fix GPU wheel: patch AMReX C++ sources for CUDA 12 NVTX header by @jameslehoux in #260

Full Changelog: v4.2.1...v4.2.2

What's Changed

• fix GPU wheel: patch AMReX C++ sources for CUDA 12 NVTX header by @jameslehoux in #260

Full Changelog: v4.2.1...v4.2.2

v4.2.1

What's Changed

• Fix wheel builds and publish GPU wheels to PyPI by @jameslehoux in #259

Full Changelog: v4.2.0...v4.2.1

What's Changed

• Fix wheel builds and publish GPU wheels to PyPI by @jameslehoux in #259

Full Changelog: v4.2.0...v4.2.1

v4.2.0

What's Changed

• tutorial 01: handle ConvergenceError in parametric sweep by @jameslehoux in #250
• make visualization notebook Colab-ready with badge and live plotfile by @jameslehoux in #251
• restructure profiling notebook around bottleneck hunt by @jameslehoux in #252
• fix §7 TinyProfiler capture — run solve in subprocess by @jameslehoux in #253
• profiling notebook: surface hidden findings from full-run analysis by @jameslehoux in #254
• phase 1: close the solver-choice gap (#256) by @jameslehoux in #257
• phase 2: build_info() surface + scaling-validation harness (#256) by @jameslehoux in #258

What's Changed

• tutorial 01: handle ConvergenceError in parametric sweep by @jameslehoux in #250
• make visualization notebook Colab-ready with badge and live plotfile by @jameslehoux in #251
• restructure profiling notebook around bottleneck hunt by @jameslehoux in #252
• fix §7 TinyProfiler capture — run solve in subprocess by @jameslehoux in #253
• profiling notebook: surface hidden findings from full-run analysis by @jameslehoux in #254
• phase 1: close the solver-choice gap (#256) by @jameslehoux in #257
• phase 2: build_info() surface + scaling-validation harness (#256) by @jameslehoux in #258

Full Changelog: v4.1.2...v4.2.0

v4.1.2

What's Changed

• Fix CPU wheel build: use manylinux_2_28 image and powertools repo by @jameslehoux in #249

Full Changelog: v4.1.1...v4.1.2

What's Changed

• Fix CPU wheel build: use manylinux_2_28 image and powertools repo by @jameslehoux in #249

Full Changelog: v4.1.1...v4.1.2

v4.1.1

What's Changed

• Fix CuPy solver tolerance parameter and update tutorial installations by @jameslehoux in #246
• Fix T4 GPU TypeError in CuPy CG solver and Tutorial 2, 4 and 7 CPU install by @jameslehoux in #247
• Build compiled CPU wheels with C++ bindings on PyPI by @jameslehoux in #248

Full Changelog: v4.1.0...v4.1.1

What's Changed

• Fix CuPy solver tolerance parameter and update tutorial installations by @jameslehoux in #246
• Fix T4 GPU TypeError in CuPy CG solver and Tutorial 2, 4 and 7 CPU install by @jameslehoux in #247
• Build compiled CPU wheels with C++ bindings on PyPI by @jameslehoux in #248

Full Changelog: v4.1.0...v4.1.1

v4.1.0

v4.1.0 — Pure-Python Solver Backend

Highlights

pip install openimpala now just works — no compiled extensions, no CUDA toolkit, no MPI required. GPU acceleration is automatic when CuPy is installed.

New Features

• Pure-Python solver backend (openimpala/_solver.py) — a drop-in replacement for the C++ HYPRE solver using SciPy/CuPy sparse matrices
  • 7-point stencil Laplacian with harmonic-mean face coefficients (same algorithm as C++)
  • Dirichlet BCs at inlet/outlet, zero-flux Neumann on sides
  • Sparse CG solve: CuPy on GPU (auto-detected), SciPy on CPU
  • Flood-fill percolation check via scipy.ndimage.label
  • Validated against all analytical benchmarks (uniform block, series/parallel layers)
• Automatic backend detection — Session() transparently selects C++ or Python backend based on what's available
• Two clean install paths:
  • pip install openimpala — pure Python, works everywhere (Colab, laptops, CI)
  • pip install openimpala-cuda — compiled C++ HYPRE backend for HPC clusters

Bug Fixes

• Fix GPU wheel CUDA device linking — added CUDA_SEPARABLE_COMPILATION and CUDA_RESOLVE_DEVICE_SYMBOLS to resolve __cudaRegisterLinkedBinary_* undefined symbols in _core.so
• Fix MLMG solver — reverted boundary coefficient and PFMG stability changes to match master (multiple commits)
• Fix benchmark scripts — corrected PYTHONPATH and solver list in benchmark runners

Build & Packaging

• CPU wheel workflow replaced with pure-Python python -m build (no CMake, no cibuildwheel)
• New python/pyproject.toml for setuptools-based pure-Python wheel build
• scipy>=1.7 added as a core dependency
• _solver.py added to CMake install list for compiled wheels

Documentation

• All 7 tutorials updated: install cell is now !pip install openimpala [extras]
• notebooks/profiling_and_tuning.ipynb simplified install
• README, getting-started, gpu.md, index.rst updated for new install model
• paper.md updated distribution description

What's Changed

• Fix benchmark script not found inside Apptainer container by @jameslehoux in #235
• Fix benchmark PYTHONPATH: use python/ not cmake_build_bench/ by @jameslehoux in #236
• Fix MLMG boundary coefficients and improve PFMG stability by @jameslehoux in #237
• Fix MLMG tortuosity: pin boundary cells to match HYPRE convention by @jameslehoux in #238
• Fix TortuosityMLMG build: add missing cell_active constant by @jameslehoux in #239
• Fix MLMG: adjust face Dirichlet values to match HYPRE cell-centre BCs by @jameslehoux in #240
• Revert MLMG and PFMG solver changes; fix GPU wheel install by @jameslehoux in #241
• Add CUDA runtime packages and fix GPU wheel build issues by @jameslehoux in #242
• Fix benchmark script path and improve solver configurations by @jameslehoux in #243
• Add pure-Python solver backend for simplified installation by @jameslehoux in #245

Full Changelog: v4.0.6...v4.1.0