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The
High Level Trigger (HLT) is the second (and last)
level of trigger of LHCb, running after the L0 trigger.
Its input and output rates are 1MHz and 3KHz
respectively. It consists of a C++ application that runs on every CPU of the
Event Filter Farm (EFF), which contains between 1000 and 2000 computing
nodes. Currently there are 26110 tasks available on the EFF. The
HLT application has access to all detector data in one event,
but given the 1 MHz output rate of the L0 trigger
and the limited CPU power available, the HLT aims
at rejecting the bulk of the events by using only part of the full
information which is available. A brief description of the HLT
trigger design can be found here. |
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General: |
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Performance (old results for HltSys
v2r0) |
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For
the developers: |
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Archive
of obsolete material: |
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Twiki with information for HLT developers (Establish or monitor an alley / add an algorithm
/ reconstruct …) |
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