 26 Jan 2022, Konstantin Olchanski, Forum, Issue in data writing speed
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> Francesco, when you say "writing an event is slow", do you mean it in the frontend
> or in the output data file?
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26 Jan 2022, Konstantin Olchanski, Bug Report, Off-by-one in sequencer documentation
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> > Shades/ghosts of FORTRAN. c/c++/perl/python loops loop from 0 to n-1.
>
> for (i=1 ; i<=10 ; i++); ;-)
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26 Jan 2022, Konstantin Olchanski, Bug Report, Writting MIDAS Events via FPGAs
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>
> > Any error messages printed by the frontend? any error message in midas.log? core dumps? crashes?
> > I do not understand what you mean by "did not get the data into midas". You create events
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26 Jan 2022, Konstantin Olchanski, Bug Report, Unknown Error 319 from client
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> I’m trying to run MIDAS using a frontend code/client named “fetiglab”. Run stops
> after 2/3sec with an error saying “Unknown error 319 from client “fetiglab” on
> localhost.
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26 Jan 2022, Konstantin Olchanski, Forum, mhttpd error
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> > Enable IPv6 y
>
> Probably the IPv6 problem, see here elog:2269
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 07 Feb 2022, Konstantin Olchanski, Forum, MidasWiki moved from ladd00 to daq00.triumf.ca and updated to MediaWiki 1.35
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MidasWiki moved from ladd00 (obsolete SL6) to daq00.triumf.ca (Ubuntu LTS 20.04)
and updated from obsolete MediaWiki LTS 1.27.7 to MediaWiki LTS 1.35, supported
until mid-2023, see https://www.mediawiki.org/wiki/Version_lifecycle
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08 Feb 2022, Konstantin Olchanski, Bug Fix, ODBINC/Sequencer Issue
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Please post the output of odbedit "ls -l" for /eq/ar.../variables. (you posted the
variable name as an image, and I cannot cut-and-paste the odb path!). BTW data size 4 is
correct, 4 bytes for INT32/UINT32/FLOAT. For DOUBLE it should be 8. For you it prints 32
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09 Feb 2022, Konstantin Olchanski, Bug Fix, ODBINC/Sequencer Issue
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>
> [local:mu3eMSci:S]/>cd Equipment/ArduinoTestStation/Variables
> [local:mu3eMSci:S]Variables>ls -l
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03 Mar 2022, Konstantin Olchanski, Info, zlib required, lz4 internal
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as of commit 8eb18e4ae9c57a8a802219b90d4dc218eb8fdefb, the gzip compression
library is required, not optional.
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03 Mar 2022, Konstantin Olchanski, Info, manalyzer updated
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manalyzer was updated to latest version. mostly multi-threading improvements from
Joseph and myself. K.O. |
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15 Mar 2022, Konstantin Olchanski, Bug Fix, mhttpd ipv6 bind should be fixed now
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Something changed after my initial implementation of ipv6 in mhttpd
and listening to ipv6 http/https connections was broken.
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22 Mar 2022, Konstantin Olchanski, Bug Fix, fix for event buffer corruption in bm_flush_cache()
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multithreaded frontends have an unusual event buffer corruption if the write
cache is enabled. For a long time now I had to disable the write cache on
all multithreaded frontends in alpha-g, I was hitting this bug quite often.
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23 Mar 2022, Konstantin Olchanski, Bug Fix, mhttpd ipv6 bind should be fixed now
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> Something changed after my initial implementation of ipv6 in mhttpd
> and listening to ipv6 http/https connections was broken.
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23 Mar 2022, Konstantin Olchanski, Bug Fix, fix for event buffer corruption in bm_flush_cache()
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I confirm, there is no problem in single-threaded programs, and
there is no problem if all bm_send_event() and bm_flush_cache() are called
from the same thread.
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23 Mar 2022, Konstantin Olchanski, Bug Fix, mhttpd bug fixed
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the mhttpd bug should be fixed now (branch feature/buffer_mutex).
simplest way to reproduce:
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24 Mar 2022, Konstantin Olchanski, Bug Fix, mhttpd bug fixed
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> > 1st wget stops (by ctrl-C), socket is closed, mongoose frees it's mg_connection object
> > (corresponding worker is still labouring, hmm... actually sleeping, and now has a stale nc pointer)
> >
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24 Mar 2022, Konstantin Olchanski, Bug Fix, fix for event buffer corruption in bm_flush_cache()
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> Thanks for the investigation. Back in 2020, we had some issues
> of losing data between the system buffer and the logger writing them
> to disk (https://daq00.triumf.ca/elog-midas/Midas/1966). This was polled equipment
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24 Mar 2022, Konstantin Olchanski, Bug Report, data missing in runXXXXXX.mid
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> > It would be good to pin point there the data is lost. This is the sequence:
> >
> > frontend user code -> mfe.c code -> SYSTEM buffer -> mlogger -> disk
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24 Mar 2022, Konstantin Olchanski, Bug Report, data missing in runXXXXXX.mid
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> One idea: we should have a look at mlogger::close_channels().
> There the SYSTEM buffer is emptied through the cm_yield() call.
> Instrumenting this with some debugging code will enlighten us.
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24 Mar 2022, Konstantin Olchanski, Bug Fix, mhttpd bug fixed
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> As for the browser cache problem: This Chrome extension is your friend ...
for google chrome, it is easy, open the javascript debugger (left-click "inspect"),
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