June 2026 monthly summary for mfem/mfem: Delivered a critical build-system improvement by removing a hardcoded -j parallel flag in the HYPRE CMake module, enabling standard CMake parallelism management and eliminating conflicts with auto-fetched hypre. This change reduces build variability, improves CI reliability, and streamlines developer workflows. Commit ad18d18be1a34fb78fad9cc92558a7eec076c2b9 (Fix CMake parallel build issue with auto-fetched hypre) captured the change.

Month 2025-10 — Strengthened build reliability and developer experience for mfem/mfem by validating HYPRE/Umpire integration and simplifying configuration. In this period, we introduced a dedicated Umpire validation gate in FindHYPRE.cmake and removed obsolete Umpire-related warnings and checks, reducing conditional complexity and CI noise.

September 2025: Delivered critical HYPRE integration and compatibility improvements in mfem/mfem, advancing portability, GPU readiness, and long-term maintenance. Consolidated deprecation handling, version parsing, and header management within the build system, and integrated Umpire to improve detection, configuration, and GPU support across platforms. The work reduces build failures, stabilizes versions, and lays a solid foundation for future HYPRE upgrades and performance optimizations.

Month 2025-08: Delivered a Hypre API compatibility shim in mfem/mfem to support upcoming hypre-3.0 changes. Implemented conditional mapping for hypre_GenerateDiagAndOffd to the expected symbol based on the HYPRE version, addressing API drift and preventing build-time failures. The change is tracked under commit 59579f2cdbdafe2441bb048e1ac66d80a30f8e5a. This work improves forward-compatibility for users upgrading Hypre without code changes, reduces release blockers, and demonstrates robust conditional compilation and version-aware API adaptation.

In 2025-06, delivered a focused upgrade of the Hypre library in GEOS-DEV/thirdPartyLibs, aligning the build system with a modern release and reducing technical debt. The upgrade touched CMakeLists.txt and Spack configurations, removed outdated memory-tracking patches and deprecated GMRES references, and refactored the update script to fetch and checksum the new version. Also fixed a corner-case issue in hypre_ParVectorSetValuesTagged to improve numerical stability. These changes culminated in more reliable builds, smoother downstream integration, and reduced maintenance burden.