 20 Aug 2021, Stefan Ritt, Bug Report, select() FD_SETSIZE overrun
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> I am looking at the mlogger in the ALPHA anti-hydrogen experiment at CERN. It is
> mysteriously misbehaving during run start and stop.
>
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24 Aug 2021, Stefan Ritt, Bug Fix, changes in history plots
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One addition I would be in favour of is to remove the "Order" and replace it with drag&drop handles, because this is what people are more
used to today. Only the old guys like us remember the /etc/init.d/xx_yy scheme where one uses an integer number in the file name to
determine an order.
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17 Sep 2021, Stefan Ritt, Forum, mhttpd crash 
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To limit the impact of the numerous crashes of mhttpd, I installed the monit tool at MEG at PSI
(https://en.wikipedia.org/wiki/Monit). It monitors mhttpd, and if it cannot connect to it for a certain
time, it kills the process and restarts it. This covers endless loops, simple crashes (caused by the
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 19 Sep 2021, Stefan Ritt, Bug Fix, Chat working again
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Not sure how many people are using it, but the Chat facility in midas was broken
for some time now and got fixed today again.
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28 Sep 2021, Stefan Ritt, Bug Report, Install clash between MIDAS 2020-08 and mscb
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> 1) git clone https://bitbucket.org/tmidas/midas --recursive
> 2) cd midas
> 3) git checkout release/midas-2020-08
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29 Sep 2021, Stefan Ritt, Bug Report, nstall clash between MIDAS 2020-08 and mscb
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> Thank you, Stefan.
>
> I found these instructions under
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11 Oct 2021, Stefan Ritt, Info, Modification in the history logging system
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A requested change in the history logging system has been made today. Previously, history values were
logged with a maximum frequency (usually once per second) but also with a minimum frequency, meaning
that values were logged for example every 60 seconds, even if they did not change. This causes a problem.
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15 Oct 2021, Stefan Ritt, Suggestion, Adding (or improving discoverability) of TID for odbset
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> Creating an ODB key requires users to know the Type ID that are defined in
> https://bitbucket.org/tmidas/midas/src/develop/include/midas.h starting at line 320.
>
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22 Oct 2021, Stefan Ritt, Forum, mhttpd error
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> Enable IPv6 y
Probably the IPv6 problem, see here elog:2269
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25 Oct 2021, Stefan Ritt, Forum, Logger crash
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The short term solution would be to increase the logger timeout in the ODB under
/Programs/Logger/Watchdog timeout
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10 Nov 2021, Stefan Ritt, Forum, Issue in data writing speed
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Midas uses various buffers (in the frontend, at the server side before the SYSTEM buffer, the SYSTEM buffer itself, on the
logger before writing to disk. All these buffers are in RAM and have fast access, so you can fill them pretty quickly. When
they are full, the logger writes to disk, which is slower. So I believe at 2 Hz your disk can keep up with your writing
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02 Dec 2021, Stefan Ritt, Bug Report, Off-by-one in sequencer documentation
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> The documentation for the sequencer loop says:
>
> <quote>
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02 Dec 2021, Stefan Ritt, Forum, Sequencer error with ODB Inc
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Thanks for reporting that bug. Indeed there was a problem in the sequencer code which I fixed now. Please try the updated develop branch.
Stefan |
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26 Jan 2022, Stefan Ritt, Bug Report, Off-by-one in sequencer documentation
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> Shades/ghosts of FORTRAN. c/c++/perl/python loops loop from 0 to n-1.
for (i=1 ; i<=10 ; i++); ;-) |
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28 Jan 2022, Stefan Ritt, Bug Report, Writting MIDAS Events via FPGAs
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I finally got the dummy program working. There were several issues:
- event_buffer_size was defined as 10000 * 32 MB = 320 GB, exceeding the RAM of the computer
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10 Feb 2022, Stefan Ritt, Bug Fix, ODBINC/Sequencer Issue
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I tried following script:
ODBSET /Equipment/ArduinoTestStation/Variables/_S_, 10
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10 Feb 2022, Stefan Ritt, Bug Report, History plots deceiving users into thinking data is still logging
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The problem has been fixed on commit 825935dc on Oct. 2021 and runs fine since then at PSI. If TRIUMF people
agree, we can close that issue and proceed.
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14 Feb 2022, Stefan Ritt, Bug Fix, ODBINC/Sequencer Issue
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Just post here a minimal script which produces the error, so that I can try myself.
... and make sure that you have the latest develop version of midas.
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14 Feb 2022, Stefan Ritt, Bug Fix, ODBINC/Sequencer Issue
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> I noticed that "Jacob Thorne" in the forum had the same issue as us in Novemeber last
> year. Indeed we have not installed any later versions of MIDAS since then so we will
> double check we have the latest version.
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15 Feb 2022, Stefan Ritt, Bug Fix, ODBINC/Sequencer Issue
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> But the error still persists. Is there another way to update which we are missing?
The bug was definitively fixed in this modification:
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