BASIC SKETCH OF ACTIVITIES FOR THE CERN LHCB-RICH TEAM (2012 – 2017)
LHCb Computing Activities in UK Current activities UK GRID activities RICH s/w activities.
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Transcript of LHCb Computing Activities in UK Current activities UK GRID activities RICH s/w activities.
LHCb Computing Activities in UKLHCb Computing Activities in UK
• Current activities
• UK GRID activities
• RICH s/w activities
Architecture of LHCb Computing Model
- based on a distributed multi-Tier regional centre
Processing of real data at CERN (production centre)
Regional centre simulation production
Present Facilities:
Liverpool MAP - 300 node facility
RAL NT farm - closed in February after LHCb MC production
RAL CSF facility - 120 node Linux facility
RAL datastore - IBM 3494 tape robot
RAL NT delivered approx 100k RAWH events/week
MAP can deliver ~16k DST2 events/week if dedicated to LHCb
RAL DataGrid Testbed
RAL CSF
120 Linux cpu
IBM 3494 tape robot
LIVERPOOL
MAP300 Linux cpu
CERNpcrd25.cern.ch
lxplus009.cern.ch
RAL (PPD)
Bristol
Imperial College
Oxford
GLASGOW/EDINBURGH
“Proto-Tier 2”
Proposed LHCb-UK “Testbed”
Institutes
Exists
Planned Cambridge
250 PC99
JREI funding ~£0.4M
Prototype “testbed” Architecture
• Based around existing production facilities
• Intel PCs running Linux Redhat 6.1
• Mixture of batch systems (LSF at CERN, PBS at RAL, FCS at MAP).
• Globus 1.1.3 everywhere.
• Standard file transfer tools (eg. globus-rcp, GSIFTP).
• GASS servers for secondary storage?
• Java tools for controlling production, bookkeeping, etc.
• MDS/LDAP for bookkeeping database(s).
Globus been used to remotely submit scripts and run SICBMC
(CERN/RAL/Liverpool)
LHCb batch (PBS) jobs run on RAL CSF via Globus
ongoing investigations of Globus toolkt: globus-rcp, GSIFTP, RAL
datastore as GASS server
work on-going to “open up” MAP for general use i.e analysis type activitites
co-ordinating LHCb external computing - work on-going on baseline
DataModel
work on-going to harness University NT resources
major i/p to Grid PP proposal (most detailed forward look of all UK LHC
expts) - disappointment on the emphasis of final document
GRID Activities
Summary of current UK LHCb resources
2,775 SI95 shared for LHCb between RAL & Liverpool
(the lion’s share being MAP)
will increase due to RAL upgrade to 3,400 SI95 in
March
end of 2001 “Scotch” facility add additional 2,250
SI95
total end of 2001 to 5,650 SI95
by end of 2001 3.5Tb disk space distributed across
RAL/Edinburgh/Liverpool
at RAL an additional 13Tb robotic tape by year end
Estimation of needs by 2003
Assume 10-15% of 2006-2007 resources needed in 2003
& assuming UK contribution 20-25%
10,800-20,250 SI95 needed
7-14 Tb of disk
23-48Tb of “robotic” storage
Figures consistent with “bottom-up” estimation performed at CERN
Factors 2-4 greater than resources available by end of 2001
RICH softwareRICH software
• UK is co-ordinating the s/w effort
• current FORTRAN simulation written by UK
• FORTRAN simulation used in current RICH studies
still (e.g. alignment studies & optimisation wrt T11)
• since TDR move towards OO - UK prominent (e.g.
GEANT4 studies, interfacing current FORTRAN
databanks to OO-framework…)
• investigation of fast RICH reconstruction
Rich simulation with OO software(work just getting underway)
Simulation of testbeam setup – testing of Čerenkov radiation within GEANT4
Interfacing current info. from FORTRAN simulation into OO environment
Interest in photodetector simulation OO environment
Fast Online Rich Particle IdentificationFast Online Rich Particle Identification
• developing complimentary PID algorithm to offline
method for use in online applications
• online PID searches for potential Čerenkov rings for a
single track. Much less computation involved and
therefore faster.
• initial results with algorithm are encouraging and
studies into potential online applications are
progressing.
• possible gains in global PID performance with online
results merged with global algorithm, for example
background suppression.
SummarySummary
• UK in LHCb in prominent position leading Grid effort
• vital momentum remain and built upon through “GridPP” effort
• UK leading position in RICH s/w - UK effort is now moving into OO s/w and use of RICH “online”