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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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!

10. 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

11. 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

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

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

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

15. 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

16. 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.

17. 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

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