 14 Jan 2021, Pintaudi Giorgio, Forum, poll_event() is very slow.
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> Something must be wrong on your side. If you take the example frontend under
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> midas/examples/experiment/frontend.cxx
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14 Jan 2021, Isaac Labrie Boulay, Forum, poll_event() is very slow.
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> Something must be wrong on your side. If you take the example frontend under
>
> midas/examples/experiment/frontend.cxx
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15 Jan 2021, Isaac Labrie Boulay, Forum, poll_event() is very slow.
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> >
> > I'm currently trying to see if I can speed up polling in a frontend I'm testing.
> > Currently it seems like I can't get 'lam's to happen faster than 120 times/second.
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08 Feb 2021, Konstantin Olchanski, Forum, poll_event() is very slow.
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> I should mention that I was using midas/examples/Triumf/c++/fevme.cxx
this is correct, the fevme frontend is written to do 100% CPU-busy polling.
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 18 Feb 2008, Konstantin Olchanski, Bug Report, potential memory corruption in odb,c:extract_key()
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It looks like ODB function extract_key() will overwrite the array pointed to by "key_name" if given an odb
path with very long names (as seems to happen when redirection explodes in the Safari web browser, via
db_get_value(TRUE) via mhttpd "start program" button). All callers of this function seem to provide 256
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21 Feb 2008, Konstantin Olchanski, Bug Report, potential memory corruption in odb,c:extract_key()
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> It looks like ODB function extract_key() will overwrite the array pointed to by "key_name" if given an odb
> path with very long names (as seems to happen when redirection explodes in the Safari web browser, via
> db_get_value(TRUE) via mhttpd "start program" button). All callers of this function seem to provide 256
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24 Oct 2016, Tim Gorringe, Bug Report, problem with error code DB_NO_MEMORY from db_open_record() call when establish additional hotlinks
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Hi Midas forum,
I'm having a problem with odb hotlinks after increasing sub-directories in an
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25 Oct 2016, Tim Gorringe, Bug Report, problem with error code DB_NO_MEMORY from db_open_record() call when establish additional hotlinks
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oOne additional comment. I was able to trace the setting of the error code DB_NO_MEMORY
to a call to the db_add_open_record() by mserver that is initiated during the start-up
of my frontend via an RPC call. I checked with a debug printout that I have indeed
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04 Nov 2016, Thomas Lindner, Bug Report, problem with error code DB_NO_MEMORY from db_open_record() call when establish additional hotlinks
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Hi Tim,
I reproduced your problem and then managed to go through a procedure to increase the number of allowable open records. The following is the procedure |
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04 Nov 2016, Thomas Lindner, Bug Report, problem with error code DB_NO_MEMORY from db_open_record() call when establish additional hotlinks
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Hi Tim,
I reproduced your problem and then managed to go through a procedure to increase the number
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25 Nov 2016, Thomas Lindner, Bug Report, problem with error code DB_NO_MEMORY from db_open_record() call when establish additional hotlinks
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The procedure I wrote seemed to work for Tim too, so I added a page to the wiki about it here:
https://midas.triumf.ca/MidasWiki/index.php/FAQ
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16 May 2017, Konstantin Olchanski, Bug Report, problem with odb strings and db_get_record()
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Suddenly the mhttpd odb inline editor is truncating the odb string entries to the actual length of the
stored string value, this causes db_get_record() explode with "structure mismatch" errors. (Not my
fault, You Honor! Honest!). For example, I see these errors from al_check() after changing
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31 May 2017, Konstantin Olchanski, Bug Report, problem with odb strings and db_get_record()
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> What a mess.
The mess with db_get_record() and db_open_record() is even deeper than I thought. There are several anomalies.
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31 May 2017, Konstantin Olchanski, Bug Report, problem with odb strings and db_get_record()
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> 2) replace all uses of db_open_record(MODE_READ) with db_watch() in conjunction with db_get_record1().
Done to all in-tree programs, except for mana.c (not using it), sequencer.cxx (cannot test it) and a few places where watching a TID_INT.
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02 Jun 2017, Stefan Ritt, Bug Report, problem with odb strings and db_get_record()
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That all makes sense to me.
Stefan
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06 Jun 2017, Konstantin Olchanski, Bug Report, problem with odb strings and db_get_record()
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> Done to all in-tree programs, except for mana.c (not using it), sequencer.cxx (cannot test it) and a few places where watching a TID_INT.
> Nothing more needs to be done, other than turn off the check for hotlink in db_create_record() & co (removed #define CHECK_OPEN_RECORD in odb.c).
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06 Jun 2014, Alexey Kalinin, Forum, problem with writing data on disk
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Hello,
Our experiment based on MIDAS 2.x DAQ.
I'm using several identical frontend-%d with only lam source & event id changed,
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16 Jun 2014, Alexey Kalinin, Forum, problem with writing data on disk
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Hello, once again.
What I found is when I tryed to stop the run, mlogger still working and writing some
data, that i'm sure is not right, because frontend's are in stopped state
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18 Jun 2014, Alexey Kalinin, Forum, problem with writing data on disk 
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Hello,
I'm in deppression.
I removed Everything from computer with mserver and reinstall system and midas.
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11 Jul 2019, Konstantin Olchanski, Bug Report, problems with the default mhttpd configuration
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We installed recent mhttpd on a ubuntu machine and discovered a number of problems
with the default mhttpd settings.
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