 14 Sep 2023, Konstantin Olchanski, Forum, Hide start and stop buttons
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I believe the original "hide run start / stop" was added specifically for ND280 GSC MIDAS. I do not know
why it was removed. "hide pause / resume" is still there. I will restore them. Hiding logger channel
section should probably be automatic of there is no /logger/channels, I can check if it works and what
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 03 Oct 2023, Konstantin Olchanski, Bug Fix, wrong array size after loading xml or json file
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both the xml and the json decoders have a bug (fix pending). loading saved odb
from xml and json file did not truncate arrays in odb to the size of arrays in
the file. for example, if /example/double_array has size 20 in odb, but size 5
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06 Oct 2023, Konstantin Olchanski, Bug Report, Error accessing history files
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> Still get the same error with the latest version:
> 3:28 [mhttpd,ERROR] [history_schema.cxx:2913:FileHistory::read_data,ERROR] Cannot read
> '/data2/history/mhf_1692391703_20230818_hv_tc.dat', read() errno 2 (No such file or directory)
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06 Oct 2023, Konstantin Olchanski, Bug Report, Error accessing history files
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> two fixes forthcoming:
> a) check for short read in the 2nd place that I missed
> b) two write() are replaced by 2 memcpy() to a preallocated buffer and 1 write()
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06 Oct 2023, Konstantin Olchanski, Info, default midas history switched to "FILE" and "PerVariable" history
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We are very happy with the "FILE" implementation of MIDAS history and it is time
to make it the default for new experiments. This history driver works best if
"per variable" history is alos enabled. (SQL history already only works in "per-
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06 Oct 2023, Konstantin Olchanski, Info, new history panel editor
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the new history panel editor has been activated. it is meant to work the same as
the old editor, with some improvements to the history variables selection page.
this new version is written in html+javascript and it will be easier to improve,
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13 Nov 2023, Konstantin Olchanski, Forum, mlogger does not HAVE_ROOT
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> I am setting up Midas (v2.1) for a new experiment. We want to save the data in the ROOT format. We installed ROOT from source (v6.28/06), and ROOTSYS
is set. When we compile Midas, it says that it found ROOT. We set up a second logger channel where we set the filename to run%05d.root, the format to ROOT,
and the output to ROOT. Nevertheless, when starting a run, the logger writes the error that "channel '1' requested ROOT output, but mlogger is built without |
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14 Nov 2023, Konstantin Olchanski, Forum, mlogger does not HAVE_ROOT
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> Finally, make sure you start "rmlogger" and not "mlogger". Only "rmlogger" contains the ROOT binding.
Stefan is right. I forgot this. As solution to our troubles, mlogger is built without root support. use rmlogger instead.
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27 Dec 2023, Konstantin Olchanski, Forum, MidasWiki updated to 1.39.6
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MidasWiki was updated to current mediawiki LTS 1.39.6 supported until Nov 2025,
see https://www.mediawiki.org/wiki/Version_lifecycle
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29 Dec 2023, Konstantin Olchanski, Bug Report, Compilation error on RPi
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> git pull
> git submodule update
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02 Jan 2024, Konstantin Olchanski, Forum, midas.triumf.ca alias moved to daq00.triumf.ca
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the DNS alias for midas.triumf.ca moved from old ladd00.triumf.ca to new
daq00.triumf.ca. same as before it redirects to the MidasWiki and to the midas
forum (elog) that moved from ladd00 to daq00 quite some time ago. if you see any
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03 Jan 2024, Konstantin Olchanski, Forum, midas.triumf.ca alias moved to daq00.triumf.ca
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> I found the first issue: The link to
> https://midas.triumf.ca/MidasWiki/index.php/Custom_plots_with_mplot
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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, Bug Report, Warnings about ODB keys that haven't been touched for 10+ years
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> I don't immediately see a reason for saying that if a DB key is older than 10 yrs, it may not be valid.
>
> However, it would be worth learning what was the logic behind choosing 10 yrs as a threshold.
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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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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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