News

• Number of issues going down, but we still have quite a few things left to address.

• POW Jamboree - No issues (Sept 22 and 24)

Shift handover: Lukas -> Aaron

• Fix for a Windows issue by adding a dependency (PR opened by Lukas). This is related to file opening and closing on Windows, potentially caused by the same macro being opened by two tests simultaneously.

### Meetings

• LIM:
  • Question regarding architecture—do we build with v2 or v3 for AVX? - we use defaults.
  • Marco: 5% speedup using v3.

• I/O meeting

• Question raised about AOS/SOA I/O support. We need additional work here (an extra item in POW to address this starting this year).

• Axel posted a paper by Jefferson Lab claiming that their method is 10x faster than TTree and RNTuple. However, the benchmark is based on reading from a large file (hot cache, not sure about the I/O involved). If TTree and RNTuple are used correctly, this claim may not be valid.

  • Takeaway: The benchmarks were hand-coded and would have benefited from RDF bulk processing if they had been written in RDF.

• Created a draft PR for a new TFile and DrawFile backend that uses curl instead of Davix, initially as an opt-in.

Liaisons:

• CMS: Monthly meeting with CMS.
• CMS Crosspog: Focus on nanoAOD and derivatives, mostly in-development discussion.
• Dune:
• Meeting tomorrow at 5PM with two people from the US attending the ROOT workshop.

ROUND TABLE (see document for detailed reports):

• Bertrand

• Conda build - builtins are disabled on windows to get it working.

• Philippe

• Issues with threads and threadLocal, recalling what was done 7 years ago. This issue only occurs with slow disks.

• Serguey:

• Work on the HTTP server (user space).

• Issues/questions posted on the ROOT forum.

• Vassil:

• New approach to thread safety in cppInterop by Vipul.