HSF Weekly Meeting #183, 26 March, 2020

Present/Contributors: Graeme Stewart, Caterina Doglioni, Stefan Roiser, Kyle Knoepfel, Attila Krasznahorkay, Eduardo Rodrigues, Serhan Mete, Michel Jouvin, TJ Khoo, Efe Yazgan, Andrea Valassi, Pere Mato, Andrea Rizzi, Horst Severini, Paul Laycock, David Lange, Gloria Corti, Ken Herner, Liz Sexton-Kennedy, Martin Ritter, Serhan Mete, Witek Pokorski, Aman Goel

Apologies: Ben Morgan

News, general matters

Discussion with CMS

We were invited by Danilo and Markus to give a talk to CMS in a session on external projects (along with IRIS-HEP and HEP-CCE)


The “Software Institute for Data Intensive Sciences (SIDIS)” is an initiative to establish connections and promote common R&D between software engineers in natural sciences and computer science departments at universities, currently focusing on European partners. SIDIS currently is in a conceptualisation phase.

The activities of SIDIS are regularly discussed on the third Wednesday of the month, 10.00 - 11.00 CE(S)T, in the SIDIS Coordination meeting. The meeting usually contains topics to discuss and is public. If you are interested in a specific topic or SIDIS in general please join.

Current activities of SIDIS are:

If you are interested in SIDIS please subscribe to proto-sidis-concept@cern.ch. In case you don’t have a CERN account you need to follow some special instructions to subscribe. Meetings will be also announced on this list.

Alpaka training event

This has had to be postponed for now. If you are interested please sign up at https://indico.cern.ch/event/883212/. We will inform participants when the new date (tentatively end of June) and format have been decided.

Google Summer of Code 2020

The GSoC timeline has been updated: https://summerofcode.withgoogle.com/how-it-works/#timeline

The student application deadline is still March 31, but the student proposal review period is now March 31-April 20. So the new deadline for finishing the student evaluations is April 16 (instead of April 10), giving us few days to evaluate the number of slots we need to ask.

LHCC Review of HL-LHC Software and Computing

Reminder: LHCC will review software and computing plans for the HL-LHC, Amber Boehnlein (JLab) will chair. Five 20 page documents provided as input to the committee, from ATLAS, CMS, WLCG, DOMA and from Common Tools and Community Software (the HSF takes care of the later)

Latest News:

Document outline has been created and now has a fair amount of material.

Aim is now to have a reasonable draft by the end of this month, with all sections populated. This allows for our own review and an alignment with the other documents.


Please take a look and decide if we need to expand on any points (but remember the target audience)

Event Generators

The draft contribution of the WG has been merged into the full HSF document, although it still needs to receive feedback from all of the WG. Presently 5 pages plus one of references (do others foresee references, too?). This is a shorter version of the draft that was prepared last month, which we plan to complete on the same timescale and upload to arXiv (or submit to a journal).

Detector Simulation

Draft of the simulation chapter for LHCC review completed and merged into the full HSF document.

Reconstruction and Software Triggers

Were drafting text in a different document - can now move this into the main document. Contacted more trigger & reco common efforts, most of them have replied / have promised to reply.

Data Analysis

Draft added before last meeting, not substantially changed, but a few spots will require further input, notably:

HSF Feedback Process

Discussion with CMS happened on Tuesday 24, points that came up were:

Further Feedback

Working Group Updates

Data Analysis

Detector Simulation

Topical meeting 25th of March 2020 focused on non-LHC experiments. One talk from neutrino experiments (NOvA, SBN and DUNE) and one from Belle II. Neutrino community would appreciate a lot having a GPU-based module for optical photons transport that could be integrated into Geant4, as this currently is a very CPU-consuming part of the simulation.

Next topical meeting to be decided, but target is end April, beginning May.

Reconstruction and Software Triggers

Next meeting confirmed for April 1st 17-18h, ATLAS/CMS CPU optimization experiences in reconstruction code. In calendar, will be announced today.

General HSF question: we had a researcher contacting us to do some hands-on work in the WG. We think this is great! We could go two ways:

Opinions on what’s best for HSF?

Software Tools and Packaging

Event generators


We have scheduled a meeting for next week (April 1) to discuss the JANA framework’s multi-threaded scheduling mechanisms. This inaugurates a series of meetings devoted toward exploring how different experiments handle the scheduling of steps to be performed in a multi-threaded environments.


HSF/WLCG 2020 workshop

For a re-scheduled full workshop 21-25 September is the proposal being discussed

Virtual Event Proposal

The Scientific Organising Team continued discussing what we could do as a virtual event in the May slot

Current proposal to organise a 3 session event, focused on New Architectures, Portability, and Sustainability (i.e. the Tuesday Lund plenary session), but to have these three sessions spread over 3 days and only for 2 hours (roughly the time we feel that people can concentrate on remote hosted events)

This would be a learning experience for the community, that could lead the way towards less travel and f2f meetings as well as keeping activities running in times of COVID-19.

PyHEP 2020 Workshop


We changed to Zoom this week, a regular meeting has been booked until the end of the year

Next Meeting