Key4hep Discussion

Tuesday Sep 24, 2024, 1:00 PM → 2:00 PM Europe/Zurich

32/S-C22 (CERN)

Live Notes

CERN Key4hep Discussion
===

Attendees: Benedikt, Giulia, Katerina, Swathi, Juan, Mateusz, Andre, Leonhard

Apologies:

Date: September 24

## News

* October 1, CERN 70 Event, strongly consider teleworking

## Round The Table

### Giulia

* Writing the report

### Katerina

* Writing the report

### Swathi

* Submitted Pandora contribution to FCC Feasibility Study report software note
* Proceedings for ICHEP being finalised
    * Paper: https://link.springer.com/article/10.1007/s41781-021-00078-8

### Juan

* Deployed build with gcc14
* Add option for choosing compiler gcc11 or gcc14
* Werror warning about "dangling" reference coming from gcc14 coming out of dd4hep
    * false positive?
* Build issue of yesterday: root libraries were put in lib/ROOT, on lxplus ROOT from /usr/lib was picked up
* Forced cmake_install_libdir to lib instead of lib64 ever
* Overlay algorithm merged
* FCC software note: wrote some contributions.

### Mateusz

* "cppyy is not working with [complete] c++20 [syntax]"
    * podio: cannot compare versions in python because of this, `<=>` (read "spaceship operator") not supported
    * aggregation constructor also not supported (bug in ROOT) https://github.com/root-project/root/issues/16469
* JuliaFwk
    *  added separation between mockup and scheduling
        * Graph should support any kind of algo, not just mockup
        * Running with fork of project
* Key4hep
    * added ruff config for various projects
    * fwCore and podio-interfaces and IO for GaudiAlgs
        * Collection of interface types would be supported
* Preparing preparation for JuliaHep
    * Rehearsal: Friday at 14:00

### Andre

* NTR

### Leonhard

* 100 ILD dst files with relevant W channel and making plots
* Reweighting with Whizard
* Discussed template fit with, sufficient statistics available?
* Consistent treatment of 4-vectors? 
    * Neutral hadrons have zero mass at creation time
        * Leads to wrong jet estimates for the angle
    * add back all final state radiation photons leads to wrong conclusions about momentum
        * Selvaggi and Perez wrote note about Brems recovery (in new CDS)

### Benedikt

* podio PR reviewing
* parquet backend for podio to make speed comparisons
* ACAT: add link to PR in documents

 

## AOB

* Rehearsal for ECFA:
    * Friday, October 4 from 10AM

## Summerstudents

* Dates:
    * Katerina Kostova: 01/07 to 27/09
    * Giulia Gianoli: 01/07 to 27/09

## Next Meeting

October 1, 2024 (zoom)

## TODO

1:00 PM → 1:55 PM Round The Table

Speakers: Andre Sailer (CERN), Benedikt Hegner (CERN), Carsten Hensel (CBPF - Brazilian Center for Physics Research (BR)), Juan Miguel Carceller (CERN), Leonhard Reichenbach (University of Bonn (DE)), Mateusz Jakub Fila (CERN), Swathi Sasikumar (CERN)