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Cosmic Microwave Background Data Analysis At NERSC. Julian Borrill with Christopher Cantalupo Theodore Kisner. What Is The CMB ?. Cosmic - filling all of space. Microwave - redshifted by the expansion of the Universe from 3000K to 3K.

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cosmic microwave background data analysis at nersc

Cosmic Microwave Background Data Analysis At NERSC

Julian Borrill

with

Christopher Cantalupo

Theodore Kisner

what is the cmb

What Is The CMB ?

Cosmic - filling all of space.

Microwave - redshifted by the expansion of the Universe from 3000K to 3K.

Background - primordial photons coming from “behind” all astrophysical sources.

A snapshot of the Universe when it first became neutral 400,000 years after the Big Bang.

why do we care about the cmb

Why Do We Care About The CMB ?

The CMB is a unique probe of the very early Universe.

Its tiny (1:105-8) fluctuations carry information about

- the fundamental parameters of cosmology

- ultra-high energy physics beyond the Standard Model

cmb work at nersc
CMB Work At NERSC
  • Started in 1997:
    • 2 separate allocations for Maxima & Boomerang
    • together 5 users & 30,000 CPU-hours
  • Developed into premier world center for CMB analysis:
    • single allocation shared by O(10) experiments
    • O(100) users & O(1,000,000) MPP-hrs/year
  • Now includes "Big Science" satellite mission
    • split into two allocations
      • mp107 - 13 sub-orbital experiments 40 users & 500,000 MPP-hrs
      • planck: Planck satellite 60 users & 2,000,000 MPP-hrs*
slide6

The Planck Satellite

  • The primary driver for current NERSC CMB work.
  • A joint ESA/NASA mission due to launch in the fall of 2008.
  • An 18+ month all-sky survey at 9 microwave frequencies from 30 to 857 GHz.
  • O(1012) observations, O(108) sky pixels, O(104) spectral multipoles.
data management
Data Management
  • Dominated by time-ordered data
    • O(1-10) TB, O(10,000- 100,000) files
  • Each data set must be analyzed as a whole.
  • Each data analysis needs O(100x) storage.
  • Each data set may have its own format/distribution.
  • Each data set must be selectively shared.
  • Requires
    • Pre-fetching & active disk quota management
    • Efficient & abstracted run-time reading
    • Project account
task management
Task Management
  • Any member of a team must be able to
    • Access all the data
    • Access all the general & project-specific codes
    • Generate and execute standard analyses
    • Share the results with the team
  • Some members of a team must be able to
    • Control the overall team work-load/-distribution
    • Manage software versioning and access
  • Requires
    • Project account with individual user certification
    • Limited capability for most; full capability for some.
    • Synchronized data-for-task management
critical components issues
Critical Components & Issues
  • NERSC Global Filesystem
    • access from Franklin
  • Storage Resource Manager
    • optimal transfer protocols
  • Project quotas
    • separation from UNIX groups
  • Project accounts
    • appropriate queue limits
  • User accounts
    • maintain (unique) accessibility
  • Modules
    • work just fine
conclusions
Conclusions
  • NERSC has developed into the world's leading center for HPC for CMB data analysis
    • Recognized as such by the recent NASA/NSF/DOE Weiss report on the future of CMB research.
  • This reflects the NERSC resources'
    • capacity and capability,
    • accessibility,
    • long-range development plan.
  • Long may it continue !