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== mlogger - MIDAS Logger ==
== mlogger - MIDAS Logger ==


The MIDAS Logger, <span style="color:darkcyan;">''mlogger''</span>, is the main application that collects data from one or more [[frontend]]s under certain conditions and stores them onto a physical device such as disk or tape. It also acts as a history event collector and can also store data in a mySQL database.
The MIDAS Logger, <span style="color:darkcyan;">''mlogger''</span> is supplied in the MIDAS package. This utility can perform several functions (selected by the user via the  
The features and customization of the logger utility are fully described in the section [[Logging in MIDAS]] .
[[/Logger ODB tree]] ) including:
 
* logging System messages to a Message file or as message events
* logging information to a mySQL database
* writing information to an electronic logbook
* collecting and logging history events
* logging experimental data from one or more [[frontend]]s to storage device(s) such as disk or tape
*  multiple Logging Channels can be defined
*    several different storage devices, formats and compression levels can be selected
*        data can be logged to different subdirectories on disk
*        data can be logged to a remote computer, using the FTP mode
*        events can be selected for logging by Event ID or Trigger mask
*        Event Filtering can be implemented
*        runs can be automatically stopped and restarted after a certain number of events, or a certain time
*        the complete ODB contents can be saved
**            into a file at the beginning and/or end of run
**            and/or into the data stream
 
The mlogger utility runs on the backend computer, receiving events from the buffer manager. It supports three type of storage devices so far, i.e.
 
*    Disk,
*    Tape
*    FTP channel to a remote computer.
 
Data can currently be written in five different formats :
 
*    MIDAS binary,
*    ASCII,
*    ROOT
*    DUMP
 
The user may of course write their own custom data logger to save the data in any format they choose.  
 
== Starting mlogger utility ==


     Arguments
     Arguments
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Notes
Notes
    <span style="color:darkcyan;">''mlogger''</span> creates the [[/Logger ODB tree]] with default values the first time it is run
* When <span style="color:darkcyan;">''mlogger''</span> is started for the first time, it creates the [[/Logger ODB tree|/Logger]], the [[/History ODB tree|/History]] and the[[/Elog ODB tree| /Elog]] ODB trees with default values.
    The <span style="color:darkcyan;">''mlogger''</span> application requires an existing [[/Equipment tree]] in the ODB
* The <span style="color:darkcyan;">''mlogger''</span> application requires an existing [[/Equipment ODB tree]].
    Once the <span style="color:darkcyan;">''mlogger''</span> is running, you should be able to monitor its state with [[mstat]] or with [[mhttpd]].
* Once <span style="color:darkcyan;">''mlogger''</span> is running, you should be able to monitor its state with [[mstat]] or with [[mhttpd]].

Revision as of 14:39, 6 August 2013

mlogger - MIDAS Logger

The MIDAS Logger, mlogger is supplied in the MIDAS package. This utility can perform several functions (selected by the user via the /Logger ODB tree ) including:

  • logging System messages to a Message file or as message events
  • logging information to a mySQL database
  • writing information to an electronic logbook
  • collecting and logging history events
  • logging experimental data from one or more frontends to storage device(s) such as disk or tape
  • multiple Logging Channels can be defined
  • several different storage devices, formats and compression levels can be selected
  • data can be logged to different subdirectories on disk
  • data can be logged to a remote computer, using the FTP mode
  • events can be selected for logging by Event ID or Trigger mask
  • Event Filtering can be implemented
  • runs can be automatically stopped and restarted after a certain number of events, or a certain time
  • the complete ODB contents can be saved
    • into a file at the beginning and/or end of run
    • and/or into the data stream

The mlogger utility runs on the backend computer, receiving events from the buffer manager. It supports three type of storage devices so far, i.e.

  • Disk,
  • Tape
  • FTP channel to a remote computer.

Data can currently be written in five different formats :

  • MIDAS binary,
  • ASCII,
  • ROOT
  • DUMP

The user may of course write their own custom data logger to save the data in any format they choose.

Starting mlogger utility

   Arguments
       [-h ] : help
       [-e exptname ] : experiment name (see odbedit - ODB Editor and run control utility)
       [-D ] : start program as a daemon (UNIX only).
       [-s] : Save mode (debugging: protect ODB).
       [-v] : Verbose (not to be used in conjunction with -D).
   Usage
    >mlogger -D

Notes

  • When mlogger is started for the first time, it creates the /Logger, the /History and the /Elog ODB trees with default values.
  • The mlogger application requires an existing /Equipment ODB tree.
  • Once mlogger is running, you should be able to monitor its state with mstat or with mhttpd.
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