Event-Driven Messaging for Offline Data Quality Monitoring at ATLAS

Apr 14, 2015, 5:30 PM
B250 (B250)



oral presentation Track4: Middleware, software development and tools, experiment frameworks, tools for distributed computing Track 4 Session


Peter Onyisi (University of Texas (US))


During LHC Run 1, the information flow through the offline data quality monitoring in ATLAS relied heavily on chains of processes polling each other's outputs for handshaking purposes.  This resulted in a fragile architecture with many possible points of failure and an inability to monitor the overall state of the distributed system.  We report on the status of a project undertaken during the long shutdown to replace the ad hoc synchronization methods with a uniform message queue system.  This enables the use of standard protocols to connect processes on multiple hosts; reliable transmission of messages between possibly unreliable programs; easy monitoring of the information flow; and the removal of inefficient polling-based communication.

Primary author

Peter Onyisi (University of Texas (US))


Eric Torrence (University of Oregon (US)) Iurii Ilchenko (University of Texas (US)) James Frost (University of Oxford (GB))

Presentation materials