Last update:
Apr 1, 2000
|
|
|
|
The PHENIX Offline Computing System
|
David Morrison
Brookhaven National Laboratory
Speaker:
David Morrison
PHENIX is one of two large experiments at Brookhaven National
Laboratory's Relativistic Heavy-Ion Collider (RHIC), which will begin
taking physics data in the spring of 2000. Nominally, PHENIX will
collect data at 20 MB/sec, resulting in over 200 TB of raw data per
year, a volume which is expected to decrease by only a factor of two
during full event reconstruction. The novel physical conditions
created in collisions at RHIC mean that the computing environment
needs to allow for a wide variety of unanticipated analyses. A
variety of approaches are being pursued in the development of the
PHENIX offline computing system in order to address these constraints
and needs.
PHENIX uses an object-oriented analysis framework, PHOOL, which is
based on ROOT, but with a new class library architected to allow for
increased flexibility and type-safety. We are using Objectivity in
PHENIX as our database for calibrations, configuration, and meta-data
management, and we have developed design patterns that allow
interactive manipulation of certain types of persistent objects. Our
data access is primarily file-oriented, and we have developed a data
"carousel" to optimize access to data stored in HPSS. The code
development environment of PHENIX is based on freely available
software and tools where it has been reasonable to do so. The
components of the offline system have been tried, tested and proven to
various degrees in a series of "mock data" exercises. These technical
and architectural developments, our computing model, and the offline
computing approach to supporting physics analysis will be described.
Presentation:  |
|
Bulletins
| Home | Bulletins | Committees | Scientific Program | Docs by topics | Social Event | Conference Location | Secretariat |
Privacy Policy |