Week 40 · Sep 28 – Oct 2, 2026

Sep 28 – Oct 2, 2026

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Summary for Hall-B

• clas12-systems (GEMC3) now builds from scratch on bare Geant4 — compiles GEMC from subproject, proven on all distros (CI)
• PCAL compare_all_edep fix: GEMC3 now drops FADC-threshold-rejected hits from the true bank like GEMC2
• clas12Tags: LTCC CAD geometry ported from Meson branch + tech note with reproducible benchmarks
• GEMC3 raised to C++20; fixed static-linking / TLS and symbol issues in SRO and CLAS12 plugins
• Geant4 Callgrind profiling workflow added; all images updated to Geant4 11.4.3
• OSG: ongoing job-landing issues on sites not mounting jlab.opensciencegrid.org

GEMC

• Ported optimized LTCC CAD geometry from the Meson branch, with a reproducible comparison benchmark.
• Measured full LTCC CAD loading, memory, electron/hadron transport, and geometry warnings.
• Fixed the intermittent boolean_solids failure: the uniform generator vertex could spawn outside the too-small world and crash Geant4 navigation; widened the world to contain the full spread.
• Silenced the nodiscard std::stod warnings in the CAD and SQLite geometry loaders.
• Raised the project C++ standard to C++20 and stripped Geant4’s hardcoded -std=c++17 pkg-config flag so it governs every translation unit, matching ROOT’s C++20 build and removing the standard-mismatch warning.
• Adopted C++20 starts_with/ends_with, container contains(), and std::numbers::pi in place of the rfind/compare idioms, find-against-end membership tests, and the non-standard M_PI macro.

OSG

• Job-landing issues still ongoing: problems when a job lands on sites not mounting jlab.opensciencegrid.org.
• Updated HTCondor requirements for JLab CVMFS, Linux X86_64, resources, and file transfer.
• CLAS12 Discourse updated.

Geant4

• Installations moving to the new JLab point jlab.opensciencegrid.org.
• Updated all images to Geant4 11.4.3.
• Added a Callgrind profiling workflow running after the image deploy on the Ubuntu Geant4 debug image, with a per-example matrix job compiling and saving the top 30 routines.
• Extracted example compilation and the beamOn event-count override into reusable CI scripts and wired them into the Callgrind workflow.
• Added field03 and a physics-list matrix dimension, with a script that patches an example’s physics list to the extensible factory so hardcoded examples can be swapped.
• Reworked the Callgrind workflow to profile each example through the Callgrinder action like src and clas12-systems, with a Geant4 category config and a report job aggregating every cell.

GEMC3

• MILESTONE: clas12-systems now installs from scratch with no pre-existing GEMC — it compiles GEMC from the gemc subproject onto a bare Geant4 (g4install) environment, and the Test CI workflow proves it across every supported distro.
• Diagnosed the PCAL compare_all_edep failure as gemc3 keeping FADC-threshold-rejected ECAL hits in the true bank while GEMC2 drops them; made intrinsic threshold/efficiency rejection also drop the true-info row to match GEMC2.
• Added a GEMC subproject fallback and a use-gemc-location option so clas12-systems builds GEMC from source when no install is found, keeping Geant4 external and never autobuilt.
• Made the GEMC subproject dependency propagate yaml-cpp so plugins resolve the public goption.h include that an installed GEMC supplies via its headers.
• Made generate_geometry.zsh default to the build-tree pygemc venv so detector scripts find pygemc and clas12_common without a hand-set interpreter.
• Gated GEMC’s own tests and examples behind a standalone-build check so they no longer pollute clas12-systems meson test when GEMC is built as a subproject.
• Pointed the SRO full-path test at the installed GEMC when GEMC is built from source, since the subproject build-tree binary cannot resolve its runtime layout.
• Changed SRO plugin linkage to reuse runtime framework symbols and avoid Linux static TLS exhaustion.
• Isolated bundled XML parser symbols to fix static linking; verified mesh imports and simulation.
• Fixed SRO example linking with strict symbol checks; verified crate output across worker counts.
• Removed special GEMC data-library linking from CLAS12 plugins and verified release plugin loading.
• Fixed CLAS12 profiling builds to resolve shared GEMC libraries while preserving static release linking.
• Moved Meson native-file settings into project defaults and verified CI overrides and a fresh build.
• Documented the meson dependency-loading logic for CLHEP, Qt6, and Geant4 in new READMEs under both meson directories, explaining the producer/consumer split and why CLHEP stays shared in the core but static in the plugins.
• Split thread-scaling scenarios into independent matrix jobs with separate reports and a shared build; moved thread-scaling builds and runs to Ubuntu 26.04 Geant4 images with explicit dependencies.
• Standardized CI environment logs with CPU, Docker, Geant4, and physics-data details.
• SRO presentation to the EPSCI/SRO meeting; SRO channel added to Team SciComp.

Homepage

• Fixed HTCondor edit examples to pass requirements without embedded newlines; corrected requirements inspection and added compact job-status counts.
• Clarified cluster-wide and held-only HTCondor edits and removed the Oasis revision requirement; documented edits to queued jobs for CVMFS, memory, and site exclusions.
• Refreshed release news, added journal highlights and the upcoming OSG note, and clarified homepage content.
• Extended weekly reports to refresh relevant homepage news, releases, projects, and profile content.
• Extended weekly reviews to adapt GEMC website content for pygemc, src, and clas12-systems changes.
• Added local recipe publishing and a dinner-planning page with meal choices and a cuisine directory; iterated on grouped ingredients, date labels, a compact two-column layout, pantry-ingredient metadata, centralized pantry staples with recipe-specific exclusions, and editable shared defaults (water, milk, butter) while preserving full recipes.

CLAS12 Notes

• Added matched STL images of the original and optimized LTCC hardware, nose, and Winston cones.
• Clarified that LTCC transport CPU differences may reflect navigation defects and incomplete particle histories.
• Started a CLAS12 technical note on CAD optimization with reproducible measurements and validation.

Actions

• Moved profiling summary enhancements into a new release and preserved the previous release notes; added source and call-count columns and verified report output.
• Reworded the Callgrinder report legend so a healthy run no longer trips the smoke test’s unavailable guard, and confirmed the full suite passes.
• Reordered the Callgrinder top-routines table so the source file sits before the routine and call counts are last; updated the affected tests.
• Verified profiling summary columns, fixed ABI-tagged call counts, and added new release notes.
• Fixed weekly website reviews to enforce structured edits and report agent response failures clearly.