 27 Nov 2020, Konstantin Olchanski, Info, Equipment "common" settings in ODB
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> Today I addressed a topic which bugged me since long time.
Right. No easy subject. For me, too, this has been a problem in MIDAS for a long time.
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27 Nov 2020, Stefan Ritt, Info, Equipment "common" settings in ODB
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Ok, so what about the following proposal:
- I change back the mfe.cxx code to behave like before (ODB has precedence and does not get overwritten when the
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27 Nov 2020, Konstantin Olchanski, Info, Equipment "common" settings in ODB
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Yes, I think this will work.
For old mfe.c frontends, global variable set to "do it the new way" should be okey,
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30 Nov 2020, Stefan Ritt, Info, Equipment "common" settings in ODB
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Ok, I implemented it the following way:
- Added a boolean flag "equipment_common_overwrite", which must be contained in EACH frontend, preferably just
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30 Nov 2020, Stefan Ritt, Info, Equipment "common" settings in ODB
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One more change:
After using the new code for some hours, we realized that the "enabled" flag should not come from the frontend code,
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30 Nov 2020, Konstantin Olchanski, Info, Equipment "common" settings in ODB
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> One more change:
>
> After using the new code for some hours, we realized that the "enabled" flag should not come from the frontend code,
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 30 Nov 2020, Konstantin Olchanski, Info, more wisdom from linux kernel people
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As you may know, I am a big fan of two software projects - the linux kernel and ROOT. The linux kernel is one of
the few software projects "done right". ROOT is where normal people try to "get it right" with real-world level
of success. I use both softwares daily and I try to apply their ways and methods to MIDAS as much as I can.
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06 Jan 2021, Isaac Labrie Boulay, Info, Recovering a corrupted ODB using odbinit.
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Hi all,
I am currently trying to recover my corrupted ODB using odbinit and I am still
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21 Jan 2021, Thomas Lindner, Info, Using external ELOG with newer mhttpd
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A warning, in case others have the same problem I had.
In the past you could configure mhttpd so that the 'Elog' button would redirect to an external ELOG server; to do this you only needed to create and set |
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02 Mar 2021, Konstantin Olchanski, Info, shortest possible sleep
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since I am implementing a polled equipment, I was curious what is the smallest possible sleep time on current computers.
in current UNIX, there are 2 system calls available for sleeping: select() (with microsecond granularity) and nanosleep() (with nanosecond granularity).
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02 Mar 2021, Stefan Ritt, Info, shortest possible sleep
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Why do you need that? Periodic equipment typically runs ever ten seconds or so, meaning one can do this easily in a scheduler.
For polled equipment, you don't want to sleep at all. Because if you sleep, you might miss an event. That's why I put my poll in mfe.c into a for() loop. |
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03 Mar 2021, Konstantin Olchanski, Info, shortest possible sleep
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> Why do you need that?
UNIX/POSIX advertises functions for sleeping in microseconds and nanoseconds,
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30 Mar 2021, Konstantin Olchanski, Info, INT64/UINT64/QWORD not permitted in ODB and history... Change of TID_xxx data types
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> We have to request of a 64-bit integer data type to be included in MIDAS banks.
> Since 64-bit integers are on some systems "long" and on other systems "long long",
> I decided to create the two new data types
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04 Apr 2021, Konstantin Olchanski, Info, bk_init32a data format
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In April 4th 2020 Stefan added a new data format that fixes the well known problem with alternating banks being
misaligned against 64-bit addresses. (cannot find announcement on this forum. midas commit
https://bitbucket.org/tmidas/midas/commits/541732ea265edba63f18367c7c9b8c02abbfc96e)
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04 Apr 2021, Konstantin Olchanski, Info, Change of TID_xxx data types
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>
> To be consistent, I renamed the old types:
>
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05 Apr 2021, Konstantin Olchanski, Info, blog - convert mfe frontend to tmfe c++ framework
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notes from converting ALPHA-g chronobox frontend fechrono to tmfe c++ framework.
the chronobox device is a timestamp/low resolution tdc/scaler/generic TTL and ECL io
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05 Apr 2021, Konstantin Olchanski, Info, blog - convert mfe frontend to tmfe c++ framework
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Result is here:
https://bitbucket.org/expalpha/chronobox_software/src/master/fechrono_tmfe.cxx
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13 Apr 2021, Konstantin Olchanski, Info, bk_init32a data format
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Until commit a4043ceacdf241a2a98aeca5edf40613a6c0f575 today, mdump mostly did not work with bank32a data.
K.O.
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14 Apr 2021, Stefan Ritt, Info, INT64/UINT64/QWORD not permitted in ODB and history... Change of TID_xxx data types
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> These 64-bit data types do not work with ODB and they do not work with the MIDAS history.
They were never meant to work with the history. They were primarily implemented to put large 64-
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06 May 2021, Ben Smith, Info, New feature in odbxx that works like db_check_record()
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For those unfamiliar, odbxx is the interface that looks like a C++ map, but automatically syncs with the ODB - https://midas.triumf.ca/MidasWiki/index.php/Odbxx.
I've added a new feature that is similar to the existing odb::connect() function, but works like the old db_check_record(). The new odb::connect_and_fix_structure() |