Compact Muon Solenoid

Thomas ThemelTU WienJune 2009

Institut für Hochenergiephysik, ÖAW

CMS Trigger Supervisor Framework

Ildefons Magrans de AbrilMarc Magrans de AbrilGian Pieo Di GiovanniPhilipp GlaserTobias NoebauerAlexander WinklerPhilipp WagnerJose MeloFranz MittermayrChristian Hartl

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CMS and the need for the TS

• Like the entire CMS experiment, the L1 trigger is a very complex system.

“64 crates, O(103) boards with an average of 15 MB of downloadable firmware and O(102) configurable registers per board, 8 independent DAQ partitions, and O(103) links that must be periodically tested in order to assure the correct connection and synchronization”

“27 research institutes from Europe, Asia and America”

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CSCTFCSCTF

The Trigger Supervisor

GMT GT/TCS GCTDTTFRPC

DT

CSC

CSCTF

1

HCAL

RCT

ECAL

Trigger Supervisor

RCMS

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Goals

• Present a unified interface to the entire L1 trigger system to RCMS* to allow– Configuration– Monitoring– Interconnection Tests– Logging– Error Management

* Run Control and Monitoring System

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Other constraints

• Distributed system• Disconnected development of

subsystems• Different software environments

– RCMS in Java– Subsystem applications in C++

• Partially based on CMS-developed XDAQ framework

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It's almost as bad as the internet!

• Distributed design based on web services• What is distributed?

– Subsystem application development– Running the subsystems

• What is centralized?– Development repository (TriDAS CVS)– Build system– All parts of the system based on TS framework– Configuration database

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The Trigger Supervisor Cell

• The building blocks of the TS system are called cells.

• A central cell coordinates global operations.

• Each subsystem crate runs its own cell.• Cells support defined protocol for

standard operations.• Additionally, cells are extensible to

provide subsystem-specific features.

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Architecture

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TS Cell

TS CellTS CellTS Cell …

Subsystem Cell GUI

Central Cell GUI

Hardware access

customized by every subsystem

SOAPCommon configuration DB

SOAP

0..nController side

0..n

1

1

1

1 1

1 111

0..n

RCMSRCMS

OSWI OSWI OSWI

Tree like structure where the central node and the leafs are based on a common “control cell” implemented with XDAQ

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The TS framework

• C++ (server-side)• Based on XDAQ

– Runtime– Web services support– Build system– Logging– Parts of the monitoring– Database access

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Adding functionality to TS cells

• TS framework provides “empty” cell• Main entry points for extension:

– Commands• Function calls

– Operations• Stateful interactions

– Panels• Web GUI

– DataSources• Monitoring

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Commands

• Defining commands yields– A generic GUI

– A SOAP interface for remote calls

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Operations

• Operations are based on finite state machines

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Operations 2

• Implicit GUI/remote call support• Transitions work like commands

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Panels

• Ajaxell, an AJAX GUI library– Client side based on Dojo toolkit– Allows much nicer web GUIs than older

HTTP/CGI paradigm– Prime example: L1 TM Editor

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Panels 2

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Data Sources

• A DataSource defines a set of variables for monitoring, accessible over a standard interface.

• Implicitly supports Cell GUI, central collection and storage in a database through XMAS*.

*XDAQ Monitoring and Alarming Service

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Data Sources 2

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Communication with other subsystems

• Since we can create so many nice SOAP interfaces, we also want to call them

• Also need to interact with XDAQ services for database access etc

• TS framework provides varisous “CellXhannel” implementations to simplify this– CellXhannelCell to call other TS cells– CellXhannelTStore for DB access

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Role of the Central Cell

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References and Documentation

Trigger Supervisor TWiki page: https://twiki.cern.ch/twiki/bin/view/CMS/TriggerSupervisor

• Concepts & Design:

– The CMS Trigger Su pervisor: Control and Hardware Monitoring System of the CMS Level-1 Trigger at CERN, PhD Thesis, Universitat Autònoma de Barcelona, I. Magrans

– Concept of the CMS Trigger Supervisor, CMS NOTE 2005/011, Ildefons Magrans, Joao Varela, Claudia Wulz

• Code level information

– User's Guide TS v.1.6

CV S:

http://isscvs.cern.ch/cgi-bin/cvsweb.cgi/TriDAS/?cvsroot=tridas

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Class Diagram

Subsystem

TS

XDAQ