Download PPT - Particle Physics Group

James Cunha Werner
BaBar Experiment:
US$60 million Detector installed at
SLAC/ Stanford University:
•Thousands of measured points for each event.
•3,000 million real events (1999-2005)
•3,200 million Monte Carlo events.
•2,500 computers in parallel running batch system
•290,000 data files
•161 Tera bytes of data
EasyGrid architecture: enabling an on going experiment.
Easymoncar
Monte Carlo Events generation
Easysub
Raw data analisys
Easygftp
Generic data access
Easyapp
Generic application
LCG
Grid
middleware
Easyroot
Root application
Functional gridification: Genetic Programming
Data gridification
Enabling many copies of the same binary code run in several
datasets in parallel, using GRID capabilities.
Dataset
User binary
Results
File-1
File-2
LCG
WN1
easygrid
…
WN2
…
WNN
File-N
Searching anti-Deuteron:
Raw data: 1,500 million events
1 week – 250 computer
Tau decay in N neutral pions
Monte Carlo generation: 5 million events
Raw data: 482 million events.
Enables conventional software
to use grid technologies:
•submission
•gridification algorithms
•follow up/ management
•results/reports recovery
Grid becomes transparent to the user.
Layer between complex LCG Middleware
and user application.
Easy to use! Does not require
Training or knowledge.
Enabling one algorithm running in several worker nodes.
Discriminate function to distinguish background from real
neutral pions
Random
Pop Init
Fitness
evaluation
Converge?
Best
individual
Generations
90% of all
processing
done in
distributed
fitness
evaluation:
easygrid
mutation
WN master
crossover
PVM
Selection
WN slave
WN slave
WN slave
…
Discrimination background/neutral pion accuracy: 82%
Decrease in Processing time:
Stand alone 1node/2slaves
5 nodes/10slaves
80 Ksec
47 Ksec
58%
For more information: http://www.hep.man.ac.uk/u/jamwer
Particle Physics 2006 – IoP – University of Warwick
19 Ksec
24%