LHCb activities at PIC
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1 CCRC08 post-mortem LHCb activities at PIC G. Merino PIC, 19/06/2008
2 LHCb Computing Main user analysis supported at CERN + 6Tier-1s Tier-2s essentially MonteCarlo production facilities 2
3 CCRC08: Planned tasks May activities: Maintain equivalent of 1 month data taking assuming a 50% machine cycle efficiency i Raw data distribution from pit T0 centre Raw data distribution from T0 T1 centres Use of FTS - T1D0 Recons of raw data at CERN & T1 centres RAW (T1D0) rdst (T1D0) Stripping of data at CERN & T1 centres RAW & rdst (T1D0) DST (T1D1) Distribution of DST data to all other centres Use of FTS - T0D1 (except CERN T1D1) 3
4 Activities across the sites Planned breakdown of processing activities (CPU needs) prior to CCRC08 Site Fraction (%) CERN 14 FZK 11 IN2P3 25 CNAF 9 NIKHEF/SARA 26 PIC 4 RAL 11 4
5 Tier 0 Tier 1 FTS from CERN to Tier-1 centres Transfer of RAW will only occur once data has migrated to tape & checksum is verified Rate out of CERN ~35MB/s averaged over the period Peak rate far in excess of requirement In smooth running sites matched LHCb requirements 5
6 Tier 0 Tier 1 6
7 Tier 0 Tier 1 To first order all transfers eventually succeeded Issue with UK certificates plot shows efficiency on 1st attempt Restart IN2P3 SRM endpoint CERN outage CERN SRM endpoint problems 7
8 Reconstruction Used SRM 2.2 LHCb space tokens are: LHCb_RAW (T1D0); LHCb_RDST (T1D0) Data shares need to be preserved Important for resource planning Input 1 RAW file & output 1 rdst file (1.6 GB) Reduced nos of events per recons job from 50k to 25k (job ~12 hour duration on 2.8 ksi2k machine) In order to fit within the available queues Need to get queues at all sites that match our processing time Alternative: reduce file size! 8
9 Reconstruction After data transfer file should be online, as job submitted immediately NOTE: in principle only LHCb has this requirement of online reconstruction Reco jobs will read the input data from the T1D0 write buffer Just in case LHCb pre-stages files (srm_bringonline) & then checks on the status t of the file (srm_ls) before submitting pilot job via GFAL Pre-stage should ensure access availability from cache Only issue at NL-T1 with reporting of file status 9
10 Reconstruction 41.2k reconstruction jobs Sub Done Done/ jobs jobs Sub submitted 27.6k jobs proceeded to done state Done/created ~67% NIKHEF 10.3k (26%) PIC 1.8k (4%) 2.3k (6%) 1.6k (4%) 23% 89% RAL 4.7k 3.5k 74% (11%) (8%) CERN 6.1k (14%) 5.3k 86% (13%) CNAF 3.9k 2.8k (9%) (7%) GridKa 4.1k (11%) 3.1k (7%) 72% 76% IN2P3 10.3k 6.1k 56% (25%) (14%) 10
11 Reconstruction 25k Fail Success 27.6k reconstruction jobs in events upload done state /Created 21.2k 2k jobs processed 25k events Done/25k events ~77% 3.0k jobs failed to upload rdst to local l SE Only 1 attempt before trying Failover Failover/25k events ~13% NIKHEF 1.2k (53%) PIC 1.6k (99%) 0.9k (70%) 0.0k (0%) 4% 89% RAL 3.1k 0.0k 68% (89%) (1%) CERN 5.2k (100%) CNAF 2.6k (95%) 0.7k (14%) 0.0k (1%) 76% 67% GridKa 3.0k 0.7k 58% (99%) (22%) IN2P3 5.1k (90%) 0.7k (14%) 43% 11
12 12
13 Error humano en el PIC: WN con la red desconfigurada de Mayo Hacía de black-hole (ticket-4386) 13
14 Reconstruction CPU efficiency: ratio of wall/cpu time on running jobs CNAF: more jobs than cores on a WN IN2P3 & RAL: Problems reading input data 14
15 Reconstruction CPU efficiency: ratio of wall/cpu time on running jobs PIC: The most cpu-efficient T1 15
16 dcache Observations Official LCG recommendation p3 LHCb ran smoothly at half of T1 dcache sites PIC OK - version p6 12p6 (dcap) GridKa OK - version p2 (dcap) IN2P3 -problematic - version p6 (gsidcap) Seg faults - needed to ship version of GFAL to run Could explain CGSI-gSOAP problem???? NL-T1 - problematic (gsidcap) Many versions during CCRC to solve number of issues > p3-> p4 p 16
17 Databases Conditions DB used at CERN & Tier-1 centres No replication tests of conditions DB Pit Tier-0 (and beyond) Switched to using Conditions DB 15th May for reconstruction LFC Use streaming to populate the read-only instance at T1 from CERN Problem with CERN instance revealed local l instances not being used by LHCb! Testing underway now 17
18 Stripping Stripping on rdst files 1 rdst file & associated RAW file Space tokens: LHC_RAW & LHCb_rDST DST files & ETC produced during the process stored locally on T1D1 (add storage class) Space tokens: LHCb_M-DST DST & ETC file then distributed to all other computing centres on T0D1 (except CERN T1D1) Space tokens: LHCb_DST (LHCb_M-DST) 18
19 Stripping Subm Done CERN 2.4k 2.3k CNAF 2.3k 2.0k GridKa 20k 2.0k 20k 2.0k IN2P3 4.5k 0.2k NIKHEF 03k 0.3k <0.1k 01k 31.8k stripping jobs were submitted PIC 1.1k 1.1k RAL 2.2k 1.6k Failed to resolve 17.0k datasets 9.3k jobs ran to Done Major issues with LHCb book-keeping 19
20 Stripping: T1-T1 transfers CNAF PIC Initial problems uploading to M-DST Token at PIC Catch up ok once solved GridKa RAL Stripping test limited to 4 T1 centres 20
21 Conclusiones A pesar de ser el Tier-1 más pequeño de LHCb, la calidad de servicio del PIC ha sido la más alta en el CCRC08 Se han testeado los siguientes procesos para los Tier-1 Recepción de datos desde el CERN Reconstrucción Stripping y envío de DST a otros Tier-1 Los resultados en el PIC han sido positivos Recepción de datos desde el CERN (~5MB/s) Lectura de datos desde WNs (dcap) OK Demostrada replicación de DST a otros Tier-1s a más velocidad de la requerida (catch-up) El ejercicio ha sido también útil para que LHCb detecte los puntos débiles de su infraestructura Grid DIRAC Mejorar el sistema de book-keeping, log-files, etc 21
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