Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 86: DAQ, trigger and electronics IV

T 86.3: Talk

Thursday, April 2, 2020, 17:00–17:15, L-3.015

Logging and Monitoring Architecture for the High Level Trigger at the Belle II Experiment — •Anselm Baur¹, Markus Prim¹, Takuto Kunigo², Pablo Goldenzweig¹, and Florian Bernlochner³ — ¹Karlsruhe Institute of Technology, Germany — ²KEK, Tsukuba, Japan — ³University of Bonn, Germany

The Belle II online software trigger — the so-called High Level Trigger (HLT) — is the second and last trigger stage applied to the detector data before it is written to permanent storage. Its purpose is to select events with interesting physics signatures to reduce the data rate from the Level-1 trigger from 30 kHz to 10 kHz. The HLT design foresees O(5000) CPU cores distributed to O(20) hardware nodes. The same Belle II analysis software framework (basf2) used for offline reconstruction is running on the HLT nodes for the online reconstruction.

This architecture has to be monitored to ensure smooth processing. Therefore, all the log outputs of the system and running subsystems are bundled in a central monitoring environment. Such a central monitoring system provides fast error recognition and enables a quick identification of problematic subsystems. Additionally, detecting issues which may lead to future errors and analysing error correlations is a power of such a monitoring approach. In this talk, we present a monitoring system with Elastic Stack for the HLT at the Belle II experiment.