Last update:
Apr 1, 2000
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Data Handling and Filter Frameworks for the D0 Level 3 Trigger System
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Amber Boehnlein1,
Gennady Briskin2,
Gustaaf Brooijmans1,
Dan Claes3,
Dave Cutts2,
Moacyr Souza4,
Gordon Watts5
- Fermilab
- Brown University
- University of Nebraska
- LAFEX/CBPF - Rio de Janeiro
- University of Washington
Speaker:
Moacyr Souza
The D0 Collaboration at the Fermilab Tevatron will use a farm of commodity PCs
running the Windows OS as the third level trigger system. Data blocks from front
end crates will move independently in a data driven mode to individual nodes of the
L3 farm. The input rate into the L3 farm is planned to start at over 1 KHz.
The data-handling framework located in every L3 farm node is built
from separate components that will load and lock events into physical
memory, examine event integrity and facilitate in the physics filter
operation. Multiple events will be staged in memory, and each node will use
SMP architecture to allow for multiple filter processes.
The L3 filter is software-based and will use all available information from D0
detector.
The trigger decision will be made based on partial event reconstruction. with the target
rejection for this trigger level is a factor of 20 with an average decision time of 50
milliseconds.
The steering code for this partial reconstruction is written in C++ and uses object
oriented design techniques and patterns. It includes flexible on-demand dynamic loading of
the reconstruction components based on the trigger menu, as well as, centralized statistics
and
error management systems.
In this paper we report on the design, implementation and status of data-handling
and filter frameworks.
Presentation:  | Short Paper:  |
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