Channel Archiver Update Nov 2000 KayUwe Kasemir LANL

Channel Archiver Update Nov. 2000 Kay-Uwe Kasemir, LANL

Channel. Archiver • Sources, docs : – http: //lansce. lanl. gov/lansce 8/epics/PC • In use for >1 year: – DESY: Weather Report – LEDA (LANL) ~7 GB total, ~3000 channels @ 30 s – PSI ~200 MB/day ?

Components • • Engine: Taking data from Channel. Access CGI Tool: Web access to data Win. Browser: Win 32 tool for fast archive browsing xarr, Strip. Tool: Unix tools with archive access xarr supports Multi. Archive, new Strip. Tool history module • Scripting access for more sophisticated analysis (TCL): now SWIG based • Archive I/O library, portable archive I/O, extendable for different file formats: DESY working on SDDSArchive

xarr, Strip. Tool • Xarr can use archiver I/O library (Chris Larrieu, JLab) • Strip. Tool has history module (Nick Pattengale, LANL) Historic data!

Chan. Arch. Scripting Interface • SWIG-based: tcl, perl*, python (* no examples)

CAr. DMiner • “Channel. Archive Data Miner” Nick Pattengale (LANL) • python archive copy/repair: copy range of channels/time, apply code snippets

Main Issues • HPUX (threads, C++ library) – Wait for EPICS 3. 14 to solve this? • Not single program but “system”, already too complex for newcomers – Needs “Archiver 101” manual • Requested features – Better immunity against strange time stamps – Never enough methods of plotting – Network-access, not via NFS but to server with data reduction (averaging, FFTs, …) – Alternatives to binary file format