Channel Archiver Update

1
Channel Archiver Update

• Nov. 2000
• Kay-Uwe Kasemir, LANL

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ChannelArchiver

• Sources, docs
• http//lansce.lanl.gov/lansce8/epics/PC
• In use for gt1 year
• DESY Weather Report
• LEDA (LANL)7GB total, 3000 channels _at_ 30s
• PSI200MB/day ?

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Components

• Engine Taking data from ChannelAccess
• CGI Tool Web access to data
• WinBrowser Win32 tool for fast archive browsing
• xarr, StripTool Unix tools with archive
  accessxarr supports MultiArchive, new StripTool
  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

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xarr, StripTool

• Xarr can use archiver I/O library (Chris Larrieu,
  JLab)
• StripTool has history module (Nick Pattengale,
  LANL)

Historic data!
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Chan.Arch. Scripting Interface

• SWIG-based tcl, perl,python( no examples)

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CArDMiner

• ChannelArchive Data Miner Nick Pattengale
  (LANL)
• python archive copy/repair copy range of
  channels/time,
  
  apply code snippets

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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 Archiver101 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