 11 Dec 2025, Konstantin Olchanski, Bug Report, manalyzer fails to compile on some systems because of missing #include <cmath>
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> TFile.h -> TDirectoryFile.h -> TDirectory.h -> TNamed.h -> TString.h -> TMathBase.h -> cmath -> math.h
reading ROOT release notes, 6.38 removed TMathBase.h from TString.h, with a warning "This change may cause errors during compilation of
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12 Dec 2025, Konstantin Olchanski, Bug Report, odbxx memory leak with JSON ODB dump
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> > Confirmed fixed, thanks! There are 2 small changes I made in odbxx.h, please pull.
> There was one missing enable_jsroot in manalyzer, please pull yourself.
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 05 Feb 2026, Konstantin Olchanski, Bug Report, omnibus bugs from running DarkLight
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We finished running the DarkLight experiment and I am reporting accumulated bugs that we have run into.
1) history plots on 12 hrs, 24 hrs tend to hang with "page not responsive". most plots have 16-20 variables,
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16 Apr 2026, Konstantin Olchanski, Forum, Migrate Legacy code to current Midas version
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> I am migrating the full CRIPT muon tomography detector from MIDAS (SVN Rev.
> 5238, circa 2012) to a more modern release.
> The current system runs on Scientific Linux 6 and very old hardware.
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16 Apr 2026, Konstantin Olchanski, Suggestion, mhttpd user permissions
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We had our periodic discussion on MIDAS web page user permissions. (I cannot
find the link to the previous discussions, ouch!)
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24 Apr 2026, Konstantin Olchanski, Bug Report, increasing the max number of hot links in ODB
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> when I attempted to increase the max number of hotlinks in ODB , defined as
> #define MAX_OPEN_RECORDS 256 /**< number of open DB records */
> assert(sizeof(DATABASE_CLIENT) == 2112);
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27 Apr 2026, Konstantin Olchanski, Bug Report, increasing the max number of hot links in ODB
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> Indeed, updating MIDAS clients on each and every RPI etc in a running experiment may be a real challenge.
actually, only local clients must be rebuilt, remote clients connecting to the mserver do not care about ODB
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27 Apr 2026, Konstantin Olchanski, Bug Report, increasing the max number of hot links in ODB
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> I wonder why one needs more than 256 hotlinks at all.
I confirm that ALPHA is running with MAX_OPEN_RECORDS changed from 256 to 2048,
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21 May 2026, Konstantin Olchanski, Info, manalyzer --save-odb
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Due my oversight, the code for extracting ODB dumps from MIDAS data files from rootana/old_analyzer/event_dump.cxx was missing in
manalyzer.cxx.
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21 May 2026, Konstantin Olchanski, Bug Report, incompatible ODB XML dumps
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While testing manalyzer, I found that it dies from an exception on odbxx, error message is "/home/olchansk/packages/midas/include/odbxx.h:1231: No "handle"
attribute found in XML data".
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25 Jun 2026, Konstantin Olchanski, Forum, midas forum elog updated
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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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25 Jun 2026, Konstantin Olchanski, Bug Report, incompatible ODB XML dumps
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> I fixed that by not requiring the handle explicitly ...
>
> [it was...] an uncaught exception. If you do not want the abort, catch the exception.
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25 Jun 2026, Konstantin Olchanski, Suggestion, Multithreaded deferred transitions
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> Multithreaded transitions were introduced by KO in 2019. Please ask him to make deferred transitions work
> again or simply use non-multithreaded transitions.
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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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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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31 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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14 Oct 2019, Joseph McKenna, Forum, tmfe.cxx - Future frontend design
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Hi,
I have been looking at the 2019 workshop slides, I am interested in the C++ future of MIDAS.
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18 Oct 2019, Joseph McKenna, Info, sysmon: New system monitor and performance logging frontend added to MIDAS 
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I have written a system monitor tool for MIDAS, that has been merged in the develop branch today: sysmon
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