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CLAS12 Computing Requirements. G.P.Gilfoyle University of Richmond. CLAS12 Computing Requirements. Assume October, 2014 start date. Present major assumptions and results for: Data acquisition Calibration Simulation Reconstruction Reconstruction studies Physics analysis.

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slide1

CLAS12 Computing Requirements

G.P.Gilfoyle

University of Richmond

slide2

CLAS12 Computing Requirements

  • Assume October, 2014 start date.
  • Present major assumptions and results for:
    • Data acquisition
    • Calibration
    • Simulation
    • Reconstruction
    • Reconstruction studies
    • Physics analysis.
slide3

CLAS12 Computing Requirements

Data Acquisition

Assumptions: Event rate = 10 kHz Weeks running = 35

Event size = 10 kBytes 24-hour duty factor = 60%

Data Rate = Event Rate x Event Size = 100 Mbyte/s

Average 24-hour rate = Data Rate x 24-hour duty factor = 60 Mbyte/s

Events/year = Event Rate x Weeks Running x 24-hour duty factor

= 1.3x1011 Events/year

Data Volume/year = Events/year x Event size = 1270 TByte/year

slide4

CLAS12 Computing Requirements

Calibration

Assumptions: CPU-time/event = 155 ms Data fraction = 5%

  • Data Passes = 5 Core efficiency = 90%

CPU-time/year = Events/year x CPU-time/event-core x

Data fraction x Data passes

= 4.9x109 s

Calibration Cores = (CPU-time/year)/(year in seconds x Core efficiency)

= 173 cores

slide5

CLAS12 Computing Requirements

Reconstruction - 1

Assumptions: CPU-data-time/event = 155 ms Output/input size = 2

Data passes = 2 Fraction to disk = 10%

Event size = 10 kBytes Events/year = 1.3 x 1011

Data volume/year = 1.3 Pbytes/year Core efficiency = 90%

CPU time/year = Data-events/year x CPU-data-time/event x

Data passes

= 3.9 x 1010 CPU-s/year

Reconstruction Cores = CPU-time/year/(year in seconds x Core efficiency)

= 1387 cores

Cooked data to tape = Data volume/year x Data passes x

Output/input size

= 5080 TByte/year

slide6

CLAS12 Computing Requirements

Reconstruction - 2

Assumptions CPU-data-time/event = 155 ms Output/input size = 2

and Results: Data passes = 2 Fraction to disk = 10%

Event size = 10 kBytes Events/year = 1.3 x 1011

  • Data volume/year = 1.3 Pbytes/year Core efficiency = 90%

Disk Storage = Cooked data to tape x Fraction to disk

= 508 TByte

Average bandwidth = Event size x (1 + Output/input size) x

Cores/(CPU-data-time/event)

= 268 Mbyte/s

slide7

CLAS12 Computing Requirements

Simulation -1

Assumptions: CPU-sim-time/event = 485 ms Events/year = 1.3 x 1011

Electron fraction = 50% Simulated/data events = 10

Analyzed fraction = 50% Multiplicity = 1.5

Core efficiency = 90%

Sim-events/year = Events/year x Electron fraction x

Analyzed fraction x Simulated/data events

= 3.2 x 1011

CPU-sim-time/year = CPU-sim-time/event x Sim-events/year x Multiplicity

= 2.3 x 1011 CPU-s/year

Simulation Cores = (CPU-sim-time/year)/(year in seconds x Core efficiency)

= 8,139 cores

slide8

CLAS12 Computing Requirements

Simulation - 2

Assumptions CPU-sim-time/event = 485 ms Fraction to disk = 2%

and Results: Sim-events/year = 3.2x1011 Fraction to tape = 10%

Simulation Cores = 8,139 Multiplicity = 1.5

Output event size = 50 kBytes

Work Disk = Sim-events/year x Output event size x Fraction to Disk

= 318 TBytes

Tape storage = Sim-events/year x Output event size x Fraction to Tape

= 1,588 TBytes/year

Average Bandwidth =

(Output event size x Simulation cores)/CPU-sim-time/event

= 839 MBytes/s

slide9

CLAS12 Computing Requirements

Reconstruction Studies

  • Assumptions: CPU-data-time/event = 155 ms Fraction to disk = 5%

Data passes = 10 Core efficiency = 90%

CPU-time/year = Fraction to disk x Events/year x Data passes

CPU-data-time/event

= 3.4 x 1010 s

Cores = CPU-time/year/(year in seconds x Core efficiency)

= 1,214 cores

slide10

CLAS12 Computing Requirements

Physics Analysis

  • Assumptions CPU-data-time/event-core = 8 ms Fraction of events = 50%
  • Data passes = 10 Core efficiency = 90%

CPU-time/year = Fraction to disk x Events/year x Data passes x

CPU-data-time/event

= 1.7 x 1010 CPU-s/year

Cores = CPU-time/year/(year in seconds x Core efficiency)

= 607 cores

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