Speaker
Dr
Markus Frank
(CERN)
Description
The High Level Trigger and Data Acquisition system of the LHCb experiment at
the CERN Large Hadron Collider must handle proton-proton collisions from
beams crossing at 40 MHz. After a hardware-based first level trigger events
have to be processed at the rate of 1 MHz and filtered by software-based
trigger applications that run in a trigger farm consisting of up to 2000 PCs. The
final rate of accepted events is around 2 kHz.
This contribution describes the architecture used to host the selection
algorithms of the high level trigger on each trigger node, that is based on
shared memory event buffers. It illustrates the interplay between event
building processes, event filter processes and processes sending accepted
events to the storage system. It describes these software components that are
based on the Gaudi event processing framework.
| Submitted on behalf of Collaboration (ex, BaBar, ATLAS) | LHCb Online |
|---|
Primary author
Dr
Markus Frank
(CERN)
