1. Strategy document for LHCC – Run 4
Ian Bird
MB 14 Nov 2017
MB, 14 Nov 2017

2. Process Community White Paper
Ideas and aspirations from across broad section of HEP; wider than just HL-LHC
End 2017 – WLCG Strategy Document for LHCC
WLCG-specific view of CWP
Key topics for HL-LHC
Prioritised R&D programme for the next several years
Mid-2020 – TDR for HL-LHC Computing
Probably with an “external” review
Will not be “the computing model” but developed aspects of the strategy, and continued R&D programme
Have to ensure it is understood that there is no ”final model”
Has to indicate cost of computing (essentially flat budgets – but with more words)
MB, 14 Nov 2017

3. LHCC strategy vs CWP?
CWP is a broad bottom-up review by the HEP community
Albeit with a focus on HL-LHC
No real prioritisation
LHCC require a strategy for R&D that leads towards the TDR in 2020
By construction the CWP is a large part of that process
The strategy document is a WLCG-view, that:
Tries to prioritise where investment (R&D, changes) is likely to have a significant impact on overall cost, and optimises physics output
Sets out the R&D programme for the coming years
Leads towards a cost estimate for HL-LHC computing
Relies on the details in the CWP
MB, 14 Nov 2017

4. Document outline Introduction Themes that address cost and performance
Update of the resource requirements estimates
Themes that address cost and performance
Next slide
R&D programme & timescale
MB, 14 Nov 2017

5. Key strategies to manage cost
Software performance and efficiency
Fabric performance & efficiency, including data access
This cuts across all applications
Minimise data volumes
HLT processing, selection, nano-AODs
Reduce replication
Remote (bulk) processing without need to ship data
Cloud analysis
Reduce processing costs
Fast simulation will be a huge benefit
Improved/new algorithms (ML/DL is seen as important technology)
Minimise operations costs
Consolidation or federation at National level
Common solutions for infrastructure & software stacks
Move common services (data, workflow) into infrastructure layers
Sustainability
Common solutions and joint efforts
Common infrastructure – across HEP and with other related sciences
Authentication/authorization infrastructure – which direction?
Data preservation and reproducibility
Non-exhaustive list
MB, 14 Nov 2017

6. Summary Outline proposed
Timescale agreed with LHCC is first LHCC meeting in 2018 (Feb)
As CWP was later than anticipated
Will be reviewed by MB and OB
MB, 14 Nov 2017