Back Midas Rome Roody Rootana
  Midas DAQ System  Not logged in ELOG logo
Entry  11 Dec 2023, Pavel Murat, Forum, the logic of handling history variables ? 11x
    Reply  11 Dec 2023, Stefan Ritt, Forum, the logic of handling history variables ? Screenshot_2023-12-12_at_09.03.13.pngScreenshot_2023-12-12_at_08.57.45.pngScreenshot_2023-12-12_at_08.55.14.pngScreenshot_2023-12-12_at_08.57.37.png
       Reply  12 Dec 2023, Pavel Murat, Forum, the logic of handling history variables ? 
          Reply  13 Dec 2023, Stefan Ritt, Forum, the logic of handling history variables ? 
    Reply  28 Jan 2024, Konstantin Olchanski, Forum, the logic of handling history variables ? 
Message ID: 2653     Entry time: 11 Dec 2023     In reply to: 2652     Reply to this: 2656
Author: Stefan Ritt 
Topic: Forum 
Subject: the logic of handling history variables ? 
First of all it's important to understand that the slow control system has nothing to do
with events. So if you look at event statistics, these are the events with the slow control
data sent to the midas data file, not the history database. So the logging period (the one you 
decreased from 60s to 10s to 6s) only affect the generation of events. 

What is important in your case is the number of events sent to the ODB. You see these in the
screen output of the slow control frontend (see attachment). This number show increase every
second.

I tried your modification (change nulldev with a sine function), and left the sc_fe.cxx
otherwise untouched. I then started with a fresh ODB ("rm /"). Started logger, mhttpd, sc_fe
and started a run. In the attachments is what I see. So I don't understand what your problem
is.
Attachment 1: Screenshot_2023-12-12_at_09.03.13.png  28 kB  | Hide | Hide all | Show all
Screenshot_2023-12-12_at_09.03.13.png
Attachment 2: Screenshot_2023-12-12_at_08.57.45.png  72 kB  | Hide | Hide all | Show all
Screenshot_2023-12-12_at_08.57.45.png
Attachment 3: Screenshot_2023-12-12_at_08.55.14.png  68 kB  | Show | Hide all | Show all
Attachment 4: Screenshot_2023-12-12_at_08.57.37.png  98 kB  | Hide | Hide all | Show all
Screenshot_2023-12-12_at_08.57.37.png
ELOG V3.1.4-2e1708b5