September 2025 monthly summary for mach3-software/MaCh3: Focused on improving runtime efficiency and reducing unnecessary I/O during the adaptive covariance update path by removing a redundant file write in AdaptiveStep. The change prevents an extra save of adaptive information to disk, delivering performance gains with no change to behavior.

Month 2025-08 — MaCh3 MCMC Fitter Reliability improvements focused on correctness and stability. Implemented fixes to per-step likelihood storage, initialization order, and out-of-bounds handling to produce more trustworthy likelihood trajectories and stable sampling. These changes reduce the risk of incorrect likelihood propagation and improve the robustness of MCMC simulations used for modeling and decision-making.

July 2025 performance summary: Delivered foundational MCMC framework enhancements and CI validation updates that drive better sampling performance, reliability, and extensibility. Key outcomes include delayed rejection MCMC support and architectural refactor in MaCh3, factory pattern modernization, and CI/test updates in MaCh3Tutorial to validate MR2T2, MetropolisHastings, and DelayedMR2T2.

February 2025 monthly summary: Strengthened runtime library discovery by standardizing LD_LIBRARY_PATH across MaCh3 and MaCh3Tutorial. Implemented lib64 inclusion in environment setup, addressing potential library resolution issues and improving deployment reliability. This work reduces runtime errors on Linux, simplifies onboarding for new environments, and lays groundwork for consistent downstream builds.

January 2025 performance summary for DUNE/MaCh3_DUNE. Delivered GPU-accelerated Prob3Linear support and hardened EventRates CI/CD and tests. The CUDA-enabled build enables GPU execution for Prob3Linear, CI/CD improvements streamline workflows and debugging, and test data/path fixes stabilize EventRates tests. Result: faster, more reliable pipelines with clearer data provenance and maintainable infrastructure.