 31 Mar 2022, Stefan Ritt, Suggestion, Maximum ODB size
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Anybody some idea what the maximum ODB size can be? In the old days, the linux
kernels had a severe limit on shared memory of usually 8MB, but in the age of
64GB RAM being a standard, we should be able to grow bigger. Tried
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 13 Apr 2022, Stefan Ritt, Info, ODB JSON support
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> Per xkcd, there is a new json standard "json5". In addition to other things, numeric
> values NaN, +Infinity and -Infinity are encoded as literals NaN, Infinity and -Infinity (without quotes):
> https://spec.json5.org/#numbers
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15 Apr 2022, Stefan Ritt, Info, New midas sequencer version 
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I prepared some slides about the new features of the sequencer and post it here so
people can have a quick look at get some inspiration.
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02 May 2022, Stefan Ritt, Info, added web page for "mdump"
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Here are some of my thoughts:
- I volunteer to write the JavaScript midas bank decoder. Just a couple of pure javascript functions, no
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04 May 2022, Stefan Ritt, Info, added web pages for "show odb clients" and "show open records"
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Concerning the "scl" page, we are currently having a discussion. At the moment, one can
see midas clients in three different places:
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06 May 2022, Stefan Ritt, Info, Increased timeout for program shut down
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We had the problem in our lab that a frontend took about 6 seconds to gracefully
shut down, mainly it needed to park some motors. I found that the shutdown command
had a hard-coded timeout of 5 seconds, after which the frontend gets killed, and
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08 May 2022, Stefan Ritt, Info, RO_STOPPED with triggered events
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We had issues in one of our experiment that people used RO_STOPPED in the
equipment list together with triggered events (EQ_USER). If events are sent when
a run is stopped, this leads to many unexpected results, so I added a check in
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17 May 2022, Stefan Ritt, Info, RO_STOPPED with triggered events
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> > > some old front-end are not running any more since they do use RO_ALWAYS together with
> > triggered events.
> >
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20 Jun 2022, Stefan Ritt, Forum, Alarm on variable not updating
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There are two functions to do that, one check the last write access, the other the last write access if the run is running. The alarm condition looks like:
access(/Equipment/.../Variables/Input[10]) > 60
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05 Aug 2022, Stefan Ritt, Info, Information for midas updates though git
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Several submodules of midas have been re-organized, so if you want to pull the
newest version, you need a
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06 Aug 2022, Stefan Ritt, Info, Improvement of odbxx API
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While the odbxx API has been successfully used since the last months, a potential
problem with large ODBs surfaced. If you have lots of data in the ODB and load it
into an object like
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08 Aug 2022, Stefan Ritt, Info, Improvement of odbxx API
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After some thought, I changed the API again and removed the flag in the constructor,
so the system now automatically choses the best algorithm depending if the client
is connected to a local or a remote API. So in all cases you use again the old syntax:
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08 Aug 2022, Stefan Ritt, Info, Information for midas updates though git
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> after I set "submodule.recurse true", I still have to type "git submodule update --
> init --recursive", without --recursive, mscb/mxml is empty and the build bombs.
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15 Aug 2022, Stefan Ritt, Bug Report, firefox hangs due to mhistory
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> Firefox is hanging/becoming unresponsive due to javascript code. After stopping the script manually to get firefox back in control I have the following
message in the console
>
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17 Aug 2022, Stefan Ritt, Bug Report, firefox hangs due to mhistory
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The problem lies in your function mhistory_init_one() in Mudas.js:1965. You can only call "new MhistoryGraph(e)" with an element "e" which is something
like
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17 Aug 2022, Stefan Ritt, Bug Report, firefox hangs due to mhistory
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> Some of my histories are placed in an IFrame object. I eventually realized that my code fails
> when it tries to resize a history which is placed in an invisible IFrame. I resolved the issue
> by making sure that I am resizing plots only if they are in a visible IFrame.
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17 Aug 2022, Stefan Ritt, Bug Report, firefox hangs due to mhistory
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> Some of my histories are placed in an IFrame object. I eventually realized that my code fails
> when it tries to resize a history which is placed in an invisible IFrame. I resolved the issue
> by making sure that I am resizing plots only if they are in a visible IFrame.
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22 Aug 2022, Stefan Ritt, Suggestion, mvodb functionality to get the 'LastWritten' property of a key
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> I want to read data from the ODB with the mvodb interface in one of my frontends, it's useful to know how old that data is, so I prototyped functionality
in a pull request to mvodb:
>
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24 Oct 2022, Stefan Ritt, Suggestion, read_only odbxx?
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> I really like the concept of the odbxx interface.
> I think it would be a nice feature if one could have a read_only connection, e.g. by declaring a "const midas::odb".
> Just for fun I tried if this already works, but the compiler doesn't allow const midas::odb for e.g. the [] operator. I'm guessing this would be non-trivial |
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29 Oct 2022, Stefan Ritt, Suggestion, read_only odbxx?
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Ok, I implemented and committed that. Just call
o.set_write_protect(true)
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