A Log Service Package for the ATLAS TDAQ/DCS Group

This paper introduces the Log Service, developed at CERN within the ATLAS TDAQ/DCS framework. This package remedies the long standing problem of centralizing log messages produced by TDAQ applications in order to ease later access and maintenance. One or multiple Log Servers form the system's archival container, based on the MySQL database engine. A C++ interface is provided to access the Log Servers in a transparent manner. Furthermore, a user-friendly web-based tool intended for developers is available to easily browse and/or remove Log Messages. The outline of these software components are herein explained. Performance testing has been conducted within a controllable environment to observe the behaviour of the Log Service