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The GEO Online Detector Characterization System David Churches Cardiff University

This system monitors and characterizes the various channels produced by the interferometer. It includes signal processing software written in C++ and features frame data I/O, database I/O, and extensibility. Results are produced in the form of database records.

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The GEO Online Detector Characterization System David Churches Cardiff University

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  1. The GEO Online Detector Characterization System David Churches Cardiff University 21st August 2003 LSC meeting – Hannover – 18,21 August 2003 LIGO-G030475-00-Z

  2. GODCS • The basic purpose of the online detector characterization system is to monitor and characterize the various channels produced by the interferometer. • The software is written in C++ and includes a signal processing library • The software includes Frame Data I/O and database I/O • The system is designed to be highly extensible. All analysis is carried out by monitors and users can determine which monitors they wish to execute. • The system produces results primarily in the form of databaserecords. • Monitors can be distributed over a Beowulf Cluster. David Churches LSC meeting – Hannover – 18,21 August 2003 1

  3. People Involved • Main Development Group • Stas Babak • R.Balasubramanian • David Churches • Validation and monitors • Karsten Koetter • Uta Weiland • Martin Hewitson • Siong Heng • Thomas Cokelaer David Churches LSC meeting – Hannover – 18,21 August 2003 1

  4. Monitor Overseer. Oversees execution of monitors Monitor Server Communicates With clients Using MPI Library Distributes Data to clients And inserts Records given By the various clients MPI M M M Frame Archive Monitor Overseer. Oversees execution of monitors MPI M M Database Monitor Overseer. Oversees execution of monitors MPI M M M M GODCS Architecture David Churches LSC meeting – Hannover – 18,21 August 2003 1

  5. GODCS Monitors Event Monitors • LockStatusMon • SaturationMon • PowerTrackerMon • GlitchInPowerLineMon • HACRMon • InspiralSenseMon • LineDetectMon • PQMon • InspiralSearchMon • GlitchMon • PowerLineMon • BicoherenceMon • CrossCorrelationMon Subsidiary monitors • FrameChannelSummaryMon • DataDumperMon • NoiseGeneratorMon • NoiseGeneratorFreqMon • IIRBandFilterMon • IIRFilterMon • FIRBandFilterMon • FFTBandFilterMon • PsdMon • PsdRunMon • SpectrogramMon • TSpecDisplayMon • LIGOCalibrationMon • InspiralPreprocessMon • DelayMon David Churches LSC meeting – Hannover – 18,21 August 2003 1

  6. TRIANA • Triana is an open source platform independent Problem Solving Environment (PSE) • It is a graphical environment which allows the user to compose applications and specify their distributed behaviour • One builds an application by dragging and dropping algorithmic units from a toolbox into the workspace • Triana is built upon a communication API called the GridLab GAT which will provide a consistent API to Grid services • Triana implements SPMD parallelization – a group of units is duplicated onto available processing nodes and the data is split over the nodes David Churches LSC meeting – Hannover – 18,21 August 2003 1

  7. The TRIANA GUI • Grey boxes are units • Yellow boxes are groups of units • The pipes carry data from one unit/group to the next David Churches LSC meeting – Hannover – 18,21 August 2003 1

  8. VISUALIZING THE GODCS DATABASES • GODCS produces output in the form of database records (mySQL) • Triana has database reading and graphical display capability • We have constructed Triana groups which execute specific database queries which provide different views of the database • These queries can be run retrospectively over old database records or run online as the data comes in • For each of the GODCS database tables we will have a Triana group (s) which will keep track of the progress of the monitor David Churches LSC meeting – Hannover – 18,21 August 2003 1

  9. DATABASE MONITORING • Database details (hostname, username, password, database) stored by DBDetails Unit • Scheduling of database queries controlled by Timer Unit • Specific database query formed by MonitorViewer Units • All subsequent analysis and graphical presentation performed by 'standard' Triana units • Applications can be saved, re-opened and restarted from the same state • Applications are easily extensible and new MonotorViewers easily added David Churches LSC meeting – Hannover – 18,21 August 2003 1

  10. PLANS • The GODCS monitors will run on the Hannover beowulf and the results written into a database there • Triana will be installed at the site so experimenters can have an online view of these databases – delay determined by the time it takes to write the frames • We will engage in communication with the experimenters to maximise the effectiveness of the tools for them David Churches LSC meeting – Hannover – 18,21 August 2003 1

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