Task Force on Core Software (TFCS)

The Task Force on Core Software (TFCS) was formed in April 2016 to tackle the issues related to the framework, event model, non-event data for the software and computing upgrade.

Members of the TFCS are : Roel Aaij, Concezio Bozzi, Marco Cattaneo, Marco Clemencic, Ben Couturier, Hadrien Grasland, Benedikt Hegner, Rosen Matev, Sebastien Ponce, Gerhard Raven, Stefan Roiser, Henry Schreiner, Andrea Valassi. Members of the Parallelization Working Group and the Upgrade Reconstruction Task Force also contribute to the TFCS activities.

The work to be done is organized in a set of JIRA tasks (label is "LHCbUpgrade")

A computing infrastructure has been setup, based on git and gitlab

A nightly build is available, the associated slot is defined as lhcb-future The instructions to setup and run the code are available here.

The first hackathon of the TFCS has been held within the 7th Computing Workshop on May 26-27th 2016. The JIRA tasks hacked during this hackathon are related to (click on link to view):

• data- and control-flow GAUDI-1206, GAUDI-1132
• event model GAUDI-1207
• multi-threading GAUDI-1208

The second hackathon was held on July 7-8, 2016.

The third hackathon was held on September 19-20, 2016. The outcome of this hackathon included

• unifying prescaler classes in order to de-duplicate code
• extending Ranges for the use of DataHandles
• work on HitContainers: clean-up and factorization of indexes, replacement of non thread-safe code
• new KalmanFilter code being integrated into master and, in parallel, being ported to the future branch , as an exercise of porting a complicated algorithm
• defining a proposal for implementing conditions in Gaudi, that will be presented at the Gaudi workshop (Sep 21-23)
• fixing basic multihreaded tests of Brunel: a first bug involving memory corruption has been tackled, now the scheduling seems to not respect data dependencies (work in progress)

The scheduling has issues taking benefit of reentrant algorithms (it never schedules more that one at a time) For next hackathon, one should work on data composition, that was not really tackled in the hackathon.

Merge requests in Gaudi can be monitored here.

Meetings, mailing list

The TFCS meets every two weeks on mondays, alternating in either specific meetings or during General meetings of the software and computing upgrade.