Difference between revisions of "Subruns"

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(Created page with "A '''subrun''' scheme is available in the MIDAS event logger utility (mlogger) to split a big data file into several individual data files. This feature might be helpful ...")
 
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to split a big data file into several individual data files. This feature might be helpful if a data file from a single run gets too large (>4 GB for example) and if shorter runs are not wanted for efficiency reasons. The scheme works as follows:
 
to split a big data file into several individual data files. This feature might be helpful if a data file from a single run gets too large (>4 GB for example) and if shorter runs are not wanted for efficiency reasons. The scheme works as follows:
 
   
 
   
In the  ODB [[Explanation of Keys in the ODB /Logger/Channels tree #/Logger/Channels/<logging-channel-number>/Settings subtree | /Logger/Channels/x/Settings/ subtree]]
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In the  ODB [[Explanation of Keys in the ODB /Logger/Channels tree #/Logger/Channels/<logging-channel-number>/Settings subtree | /Logger/Channels/x/Settings/ subtree]] except where noted
*   Set  [[Explanation of Keys in the ODB /Logger/Channels tree #/Logger/Channels/0/Settings/Subrun Byte limit | Subrun Byte limit key]] to the required number of bytes for the subrun
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* If the subruns are to be stopped
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** after a certain '''time''' :
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*** Set  [[Explanation of Keys in the ODB /Logger tree #/Logger/Subrun duration | /Logger/Subrun duration]] key to the required time in seconds.
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** or after a certain '''number of bytes''' :
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*** Set  [[Explanation of Keys in the ODB /Logger/Channels tree #/Logger/Channels/0/Settings/Subrun Byte limit | Subrun Byte limit key]] to the required number of bytes for the subrun
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*    Set [[Explanation of Keys in the ODB /Logger/Channels tree #/Logger/Channels/0/Settings/Filename | Filename key]] to something like run%05d_%02d.mid. The first %05d will be replaced by the run number, while the second one will be replaced by the subrun number. This will result in files such as
 
*    Set [[Explanation of Keys in the ODB /Logger/Channels tree #/Logger/Channels/0/Settings/Filename | Filename key]] to something like run%05d_%02d.mid. The first %05d will be replaced by the run number, while the second one will be replaced by the subrun number. This will result in files such as
  

Revision as of 17:19, 9 August 2013

A subrun scheme is available in the MIDAS event logger utility (mlogger) to split a big data file into several individual data files. This feature might be helpful if a data file from a single run gets too large (>4 GB for example) and if shorter runs are not wanted for efficiency reasons. The scheme works as follows:

In the ODB /Logger/Channels/x/Settings/ subtree except where noted

  • If the subruns are to be stopped
  • Set Filename key to something like run%05d_%02d.mid. The first %05d will be replaced by the run number, while the second one will be replaced by the subrun number. This will result in files such as
   run00001_00.mid    run #1
   run00001_01.mid      "
   run00001_02.mid      "
   run00001_03.mid      "
   run00002_00.mid    run #2
   run00002_01.mid      "
   run00002_02.mid      "
   run00002_03.mid      "


Each subrun will contain an ODB dump if this is turned on via ODB Dump key.

The stopping of the "main" run (after four subruns in the above example) can be done in the usual way (event limit in the front-end, manually through odbedit, etc.).