 08 Jul 2026, Konstantin Olchanski, Suggestion, Multithreaded PySequencer
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> I was wondering if one can use multiple pysequencers at the same time and if not
> if this feature is planned in the future? Our experiment (mu3e) has one frontend
> per detector and each sequencer would only access a subset of ODB entries.
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08 Jul 2026, Konstantin Olchanski, Suggestion, Multithreaded deferred transitions
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> Deferred transition is registered by the FPN00
FPN00, yes, this rings a bell.
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 16 Jul 2026, Konstantin Olchanski, Info, c++ exceptions, follow up
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Bjarne Stroustrup gave a nice talk at CERN, good enough to bring Rene Brun out of retirement to ask a few
questions at the 1:16:50 mark.
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16 Jul 2026, Konstantin Olchanski, Info, c++ exceptions, follow up
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> If you did not want to use exceptions before watching this talk, you will after!
Not me. One issue, exceptions are unpredictable, for example, does this code always print "hello, world"?
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17 Jul 2026, Konstantin Olchanski, Bug Fix, repair of corrupted ODB free lists
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I finished debugging the code I wrote to check and repair the ODB key area and data area free lists, this
should fix the famous "ODB is full" error.
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20 Jul 2026, Konstantin Olchanski, Bug Fix, repair of corrupted ODB free lists
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> I finished debugging the code I wrote to check and repair the ODB key area and data area free lists, this
> should fix the famous "ODB is full" error.
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20 Jul 2026, Konstantin Olchanski, Forum, midas forum elog crashed, restarted
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> I updated the midas forum elog to the latest version from git: 083448f7
>
> Also investigated elogd failure to start on reboot,
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20 Jul 2026, Konstantin Olchanski, Info, c++ exceptions, follow up
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> Looks like the code formatting got messed up by the elog... here it is in the attachment instead.
unfortunately, your code does nothing because you do not call "i2c_set_bit(10, 1);".
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20 Jul 2026, Konstantin Olchanski, Forum, midas forum elog crashed, restarted
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Also a crash soon after startup:
https://elog.psi.ch/elogs/Forum/69934
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21 Jul 2026, Konstantin Olchanski, Forum, midas forum elog crashed, restarted
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crashed again, restarted. gcc address sanitizer disables core dumps by default, to enable, do this:
export ASAN_OPTIONS=abort_on_error=1:disable_coredump=0:unmap_shadow_on_exit=1
K.O. |
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22 Jul 2026, Konstantin Olchanski, Forum, midas forum elog crashed, restarted
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> crashed again, restarted. gcc address sanitizer disables core dumps by default, to enable, do this:
> export ASAN_OPTIONS=abort_on_error=1:disable_coredump=0:unmap_shadow_on_exit=1
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23 Jul 2026, Konstantin Olchanski, Info, ODB links to array elements explained
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this is a draft message, it will be updated with additional information. K.O.
Back in 2007, Stefan implemented the very useful feature, ODB links to array elements,
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23 Jul 2026, Konstantin Olchanski, Bug Fix, repair of corrupted ODB free lists
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> > I finished debugging the code I wrote to check and repair the ODB key area and data area free lists, this
> > should fix the famous "ODB is full" error.
>
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06 Aug 2026, Konstantin Olchanski, Suggestion, Multithreaded PySequencer
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> > > I was wondering if one can use multiple pysequencers at the same time and if not
> > > if this feature is planned in the future? Our experiment (mu3e) has one frontend
> > > per detector and each sequencer would only access a subset of ODB entries.
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17 Aug 2026, Konstantin Olchanski, Info, change in cm_shutdown and the Programs page
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There was a bit of confusion on the MIDAS Programs page with programs that have
similar names. This confusion relates to the use of bUnique in cm_shutdown() and
cm_exist().
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14 Feb 2020, Konrad Briggl, Forum, Writting Midas Events via FPGAs
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Hello Stefan,
is there a difference for the later data processing (after writing the ring buffer blocks)
if we write single events or multiple in one rb_get_wp - memcopy - rb_increment_wp cycle?
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02 Mar 2007, Kevin Lynch, Forum, event builder scalability
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> Hi there:
> I have a question if there's anybody out there running MIDAS with event builder
> that assembles events from more that just a few front ends (say on the order of
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15 Dec 2016, Kevin Giovanetti, Bug Report, midas.h error
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creating a frontend on MAC Sierra OSX 10
include the midas.h file and when compiling with XCode I get an error based on
this entry in the midas.h include
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14 Aug 2026, Julian Wollrath, Info, mplot.js: viridis colour scheme for 2D plots
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Dear all,
please do not be surprised if your 2D plots start looking different: The default
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30 Oct 2018, Joseph McKenna, Bug Report, Side panel auto-expands when history page updates
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One can collapse the side panel when looking at history pages with the button in
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