M. Caprini IFIN-HH Bucharest DAQ Control and Monitoring - A Software Component Model

DAQ system PANDA DAQT/FEE Workshop, April Main tasks of the DAQ sysytem Data flow (moving data from detector to storage) Selection (discard non-interesting events) Control, configuration and monitoring Control, configuration, monitoring DAQ needs a large number of parameters to describe its system topology, hardware and software components and running modes. A configuration databases could help to describe the DAQ and detector facilities. An important control task is to marshal the DAQ through its start-up and shutdown procedures so that they are performed in an orderly manner (these procedures should take the minimum amount of time to execute) During data taking, it is important to access and analyze the monitoring information (statistics data, sampled data fragments, histograms) and the errors and diagnostic messages sent by different applications User interfaces shall be provided to give a view of the status and performance of the DAQ system and allow the user to configure and control its operation

Experiment Control System LHC experiments control system experience DAQ DCS interaction PANDA DAQT/FEE Workshop, April ALICE ATLAS CMSLHCb

A software component model User requirements divided into groups related to activities providing similar functionality Groups further developed into components with well defined purposes and boundaries The components have interfaces with other components and external systems, specific functionality and their own architecture. Several domains recur across all the components (data storage, inter-process communication, graphical user interfaces,...) The component list should result after requirements gathering What follows is just a possible example, based mainly on ATLAS Online Software experience. ALICE DATE, a similar component set PANDA DAQT/FEE Workshop, April

Control & monitoring components Core components Essential functionality Priority in terms of time-scale for development in order to have a baseline sub-system that can be used for integration with the data-flow / selection Run Control Configuration Database Information sharing Message reporting Process management Graphical user interface DAQ/detector integration components Integration with other online sub-systems and sub-detectors (test beams, commissioning,...) Event monitoring Resource management (partitioning) DAQ – DCS interface Online bookkeeping Test manager PANDA DAQT/FEE Workshop, April

Run Control Functionality The Run Control component controls the data taking activities by coordinating the operations of the other components, DAQ sub-systems, external systems (FSM, hierarchical control,...) Software interfaces with the DAQ sub-systems and other software components (to exchange commands, status and information) Advanced capabilities - partitioning, error recovery (expert system),... Implementation ATLAS – CORBA communication CMS – Java, Web technologies (Web Services, SOAP,...) Web browser as user interface LHCb – based on JCOP Framework (SCADA System PVSSII & SMI++) ALICE – DATE Run Control Auxiliary tools Expert system ATLAS – Shifter Assistant LHCb - BigBrother PANDA DAQT/FEE Workshop, April

Configuration Database Functionality Used to describe a large number of parameters of the DAQ system architecture, hardware and software components, running modes and status One of the major design issues is to be as flexible as possible, parameterized by the contents of the configuration databases Implementation CMS – Oracle ATLAS – OKS (Object Kernel support – in-house developed database) ALICE – MySQL Auxiliary tools Configuration database editor PANDA DAQT/FEE Workshop, April

Information Sharing Functionality Provides an information exchange facility for software components Information from many sources can be categorized and made available to requesting applications asynchronously or on demand. Implementation LHCb, ALICE – DIM (Distributed Information Management) First version developed for Delphi Used also by JCOP Framework ATLAS – IS (Information Service) Tens of servers, thousands of information objects (including histograms) Based on CORBA Auxiliary tools Web interfaces ATLAS – WebIS, NetIS, PANDA DAQT/FEE Workshop, April

Message Reporting Functionality Provides a facility which allows all software components to report messages to other components in the distributed environment Performs transport, filtering and routing of messages. Implementation CMS – log4cplus (modeled after the Java log4j API) Loggers, appenders, layouts ATLAS – MRS (Messsage Reporting System) Message stream, CORBA Used with ERS (Error Reporting System) API Message queuing systems (ActiveMQ, AMPQ – Qpid,...) Auxiliary tools Message database ATLAS – Oracle ALICE - MySQL Message monitors ATLAS – MRSMonitor, Log Manager PANDA DAQT/FEE Workshop, April

Process management Functionality Performs basic job control of software components Capable of starting, stopping and monitoring the status (e.g. running, exited) of components independent of the underlying operating system Implemenation ATLAS – PMG (Process Manager) A PMG agent on each machine Uses a role based access management policy PANDA DAQT/FEE Workshop, April

User interfaces Functionality Allows the operator to control and monitor the status of the current data taking run in terms of it’s main parameters, detector configuration, trigger rate and state of the sub-systems Implementation PANDA DAQT/FEE Workshop, April ATLAS

Integration components Event monitoring Samples events from the data-flow to present them to the user or monitoring applications in order to verify event integrity and structure Resource management (partitioning) Allocates resources (hardware and software resources which can’t be freely shared) and allows several groups (partitions) to work in parallel without interference. DAQ – DCS interface Allows exchange of commands, information and messages between DAQ and DCS Online bookkeeping Archives information about the data recorded to permanent storage by the DAQ system Records information on a per-run basis and provides a number of interfaces for retrieving and updating the information Test manager (verification, diagnostics) Organizes individual tests for hardware and software components PANDA DAQT/FEE Workshop, April

Next steps User requirements Tehnology evaluation Databases, inter-process communication,... Architectural design Implementation, testing Platforms, languages Scalability issues IFIN-HH experience Message reporting Information sharing Graphical user interface PANDA DAQT/FEE Workshop, April