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CHEP 2000 Data Acquisition & Control

CHEP 2000 Data Acquisition & Control. Session Report Chip Watson & Pierre Vande Vyvre. Overview of Sessions. Monday: Data Acquisition Systems (“Past”, Present, and Future) Tuesday: Detector Controls + Triggering Wednesday: Event Building Thursday: Run Control & Monitoring

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CHEP 2000 Data Acquisition & Control

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  1. CHEP 2000Data Acquisition & Control Session Report Chip Watson & Pierre Vande Vyvre

  2. Overview of Sessions Monday: Data Acquisition Systems (“Past”, Present, and Future) Tuesday: Detector Controls + Triggering Wednesday: Event Building Thursday: Run Control & Monitoring Plus: posters covering all of these topics

  3. Past, Present, Future Good representative sample of experiments • Close to end: DELPHI • Running: BABAR, BELLE, KLOE, NA48 • Close to start: CDF, D0, Phenix, Star • Future:ALICE, ATLAS, CMS • Far future: Linear Collider

  4. Data Acquisition Systems • Online Data for Experiments -- ODE (toolkit) • reuse of some components from DART, CDF, D0 • “Java is the implementation language of choice” for many aspects • BELLE DAQ System, Status & Future • trend towards commodity (replacing custom switch) • Automated Data Quality Monitoring…Babar • sw pkg, 1D, 2D comparisons to ref, analytic forms... • a very nice OO design, probably worth re-using

  5. Data Acquisition Systems (cont.) • …CDF Run II Data Acq System • ATM switch, smart sockets, run control in Java, JDBC • Alice DAQ • Future: build @ 25 GB/s, write @ 1.25 GB/s • Atlas DAQ / EventFilter Prototype-1 • 400x400 switch planned • custom PMC card w/ FPGA, VHDL synthesized logic for data readout ==> custom still lives, but only close to the detector • D0 Data Acq Sys & Operational Control • NT SMPs in L3

  6. Detector Controls • DIM... (publish/subscribe toolkit) • from Delphi, reused by Babar (SMI++ transport) • Lessons learned … from Delphi • components are good, but integration is key • Babar Online Detector Control • reuse of SMI++, EPICS (encapsulated in C++ component proxies) • Phenix Ancillary Control System • EPICS for HV, OPC (OLE for process control - MS) for low voltage • SW tools @ ECAL/CMS Rome • open source good, commercial less so

  7. Triggering • a simulation of the L1 trigger for the CMS muon chamber • OO, Objectivity • the Atlas L2 Trigger • large testbeds: use of commodity processors & networks looks good • sw trigger for a tesla experiment • read everything (1-2 GB/s) & then filter

  8. Event Building • CDF • NA48 • large testbeds: thumbs up to use of commodity processors & networks • a reliable broadcast for CMS event builder • investigating ways to use commodity nets to pass event IDs • CMS Daq Column (testbed at H2) • CMS testbeds -- Gigabit Ethernet & Myrinet • future: 512x512, GE test 4x4, myrinet 8x8 • 120 MB/s/link achieved now ==> looks good for commodity stuff!

  9. Event Building (cont.) • Babar Online Computing System • 90% C++, 5% Java; careful attention to interfaces paid off (abstract API’s) • lesson learned: • a fully integrated prototype would have been valuable • dependency problems in C++ worse than expected • Data Handling & Filter Frameworks for D0 L3

  10. Run Control & Monitoring • Event Logging & Distribution for Babar Online • Babar Online DB’s • CLEO III Data Acq & Controls • Process & Data Flow Control in KLOE • Online monitoring system at KLOE • Online Monitoring & Module Maint…CDF • Star Online • Usage of ROOT in the ALICE DATE system • Scalability of Atlas DAQ/EF prototype-1 • Java Run Control System for CMS small daq • Java/CORBA Control & Monitoring - Phenix

  11. Technologies: Hardware Networking • ATM 2 • FDDI 1 • Fibre Channel 1 • Myrinet 1 • Switched Ethernet 8 • SCI 1 Processors • Intel Pentium 9 • Power PC 4 • Sparc 3 Busses & Crates • VME 12 • PCI/PMC 4 • MXI 1

  12. Technologies : System Software Languages • C/C++ • Java • Tcl/Tk • Python • XML Protocols • TCP/IP/UDP 5 • Corba 4 • COM 1 • Proprietary:1 Operating systems • AIX 1 • Linux 9 • VxWorks 4 • Lynx/OS 4 • OS/9 1 • Solaris 3 • WNT 3

  13. Technologies: Application Software Online physics analysis package • IDL 1 • JAS 2 • ROOT 4 Other packages • Objectivity • Oracle • EPICS

  14. Commercial software DBMS, middleware, GUIs • Yes, but • HEP is a small market.Soft will not be adapted. Has to fit. • Varying levels of support Sometimes below expectation. • Response-time to bugs too long. • Risk to become company-dependent. • Open-Source could help for some of these issues

  15. Past, Present, Future Moving to bigger systems: • Scalability not always obvious • Close to end: Smooth integration has sometimes taken few years • Close to start: “Real-size proto would have helped.” • Future exp: Building prototypes bigger and bigger.

  16. Misc. Observations • No Controversy this year… • HEP scaling laws . . . constants of DAQ • minutes to fill a commodity disk • DAQ rate compared to large commodity switch • number of tape drives written simultaneously => bandwidth not the problem, complexity is

  17. Summary: Trends • Linux • commodity PC’s, switched networks • OO, C++ solidly in place, Java emerging • re-use of components • offline software moving upstream • CORBA

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