 16 Jan 2024, Pavel Murat, Forum, a scroll option for "add history variables" window? 
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Dear all,
I have a "slow control" frontend which reads out 100 slow control parameters.
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 16 Jan 2024, Stefan Ritt, Forum, a scroll option for "add history variables" window?
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Have you updated to the current midas version? This issue has been fixed a while ago. Below
you see a screenshot of a long list scrolled all the way to the bottom.
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17 Jan 2024, Francesco Renga, Forum, History tags
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Dear experts,
I would like to have some clarification about the meaning and use of the
tags in the ODB under /History/Tags.
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17 Jan 2024, Pavel Murat, Forum, a scroll option for "add history variables" window?
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> Have you updated to the current midas version? This issue has been fixed a while ago.
Hi Stefan, thanks a lot! I pulled from the head, and the scrolling works now. -- regards, Pasha |
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18 Jan 2024, Andreas Suter, Forum, mhttpd eqtable
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I have two more questions related to Units, Format for Equipment/Settings:
1) It looks as if I can have units per channel only for the Input/Output channels but not for Demand/Measured channels.
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18 Jan 2024, Stefan Ritt, Forum, History tags
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This part of the system has been designed by KO, so he should reply here.
Stefan |
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18 Jan 2024, Stefan Ritt, Forum, mhttpd eqtable
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I fixed both in the current version, so please give it a try.
Stefan |
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28 Jan 2024, Pavel Murat, Forum, number of entries in a given ODB subdirectory ?
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Dear MIDAS experts,
- I have a detector configuration with a variable number of hardware components - FPGA's receiving data
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28 Jan 2024, Konstantin Olchanski, Forum, number of entries in a given ODB subdirectory ?
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Very good question. It exposes a very nasty problem, the race condition between "ls" and "rm". While you are
looping over directory entries, somebody else is completely permitted to remove one of the files (or add more
files), making the output of "ls" incorrect (contains non-existant/removed files, does not contain newly added
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28 Jan 2024, Konstantin Olchanski, Forum, History tags
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> This part of the system has been designed by KO, so he should reply here.
That's right. Some of this stuff is historical gibberish that is no longer needed
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28 Jan 2024, Konstantin Olchanski, Forum, a scroll option for "add history variables" window?
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> > Have you updated to the current midas version? This issue has been fixed a while ago.
>
> Hi Stefan, thanks a lot! I pulled from the head, and the scrolling works now. -- regards, Pasha
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28 Jan 2024, Konstantin Olchanski, Forum, dump history FILE files
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$ cat mhf_1697445335_20231016_run_transitions.dat
event name: [Run transitions], time [1697445335]
tag: tag: /DWORD 1 4 /timestamp
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28 Jan 2024, Konstantin Olchanski, Forum, slow control frontends - how much do they sleep and how often their drivers are called?
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> I have implemented a number of slow control frontends which are directed to update the
> history once in every 10 sec, and they do just that.
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28 Jan 2024, Konstantin Olchanski, Forum, the logic of handling history variables ?
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MIDAS history is very simple:
from your frontend, your write your history data to ODB /eq/xxx/variables (see below)
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28 Jan 2024, Stefan Ritt, Forum, number of entries in a given ODB subdirectory ?
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I guess you won't change your FPGA configuration just when you start a run, so I don't consider the race
condition very crucial (although KO is correct, it it there).
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29 Jan 2024, Pavel Murat, Forum, number of entries in a given ODB subdirectory ?
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Hi Stefan, Konstantin,
thanks a lot for your responses - they are very teaching and it is good to have them archived in the forum.
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29 Jan 2024, Pavel Murat, Forum, a scroll option for "add history variables" window?
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> If you have some ideas on how to better present 100500 history variables, please shout out!
let me share some thoughts. In a particular case which lead to the original posting,
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29 Jan 2024, Konstantin Olchanski, Forum, number of entries in a given ODB subdirectory ?
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> https://chat.openai.com/share/d927c78d-9914-4413-ab5e-3b0e5d173132
>
> Please note that you never can be 100% sure that the code from a LLM is correct
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29 Jan 2024, Konstantin Olchanski, Forum, a scroll option for "add history variables" window?
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familiar situation, "too much data", you dice t or slice it, still too much. BTW, you can try to generate history
plot ODB entries from your program instead of from the history plot editor. K.O. |
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03 Feb 2024, Pavel Murat, Forum, number of entries in a given ODB subdirectory ?
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Konstantin is right: KEY.num_values is not the same as the number of subkeys (should it be ?)
For those looking for an example in the future, I attach a working piece of code converted
from the ChatGPT example, together with its printout.
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