 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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 15 Dec 2020, Konstantin Olchanski, Forum, history and variables confusion
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I think you are facing several problems:
a) mlogger does not clearly explain what history names will be used for which entries
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16 Dec 2020, Konstantin Olchanski, Forum, Issues building banks.
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> I'm currently trying to build events through doing block transfers.
I am confused by your question. I assume you read a CAEN V792 ADC, but I do not know what VME master you
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16 Dec 2020, Konstantin Olchanski, Forum, Issues building banks.
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> > > I'm currently trying to build events through doing block transfers.
> >
> > I am confused by your question. I assume you read a CAEN V792 ADC, but I do not know what VME master you
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13 Jan 2021, Konstantin Olchanski, 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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08 Feb 2021, Konstantin Olchanski, Suggestion, mhttpd browser caching
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> r->rsprintf("Expires: %s\r\n", str);
The best I can tell, none of this works in current browsers. with google-chrome,
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10 Feb 2021, Konstantin Olchanski, Forum, Javascript error during run transitions.
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> I am encountering a Javascript error (TypeError: client.error is undefined) when
> I transition between run states. Does anybody have an idea of what my problem
> might be? I have pasted an example of what MIDAS logs during such sequences.
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10 Feb 2021, Konstantin Olchanski, Release, midas-2020-12-a
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midas-2020-12-a is here, see https://midas.triumf.ca/MidasWiki/index.php/Changelog#2020-12
notable change from previous midas releases:
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12 Feb 2021, Konstantin Olchanski, Bug Report, mlogger history snafu
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there is a problem with mlogger between commits xxx (17 Nov 2020) and a762bb8 (12 feb 2021). because of
confusion between seconds and milliseconds, FILE (mhf*.dat files) and SQL history are recording with
incorrect timestamps.
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25 Feb 2021, Konstantin Olchanski, Bug Report, tmfe_main.cxx missing include <signal.h>
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> The most recent commit (b43aef648c2f8a7e710a327d0b322751ae44afea) throws this
> compiler error:
> src/tmfe_main.cxx:39:11: error: 'SIGPIPE' was not declared in this scope
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25 Feb 2021, Konstantin Olchanski, Forum, TMFePollHandlerInterface timing
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> Am I right in thinking that the TMFE HandlePoll function is calle once per
> PollMidas()? And what is the difference to HandleRead()?
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25 Feb 2021, Konstantin Olchanski, Bug Report, Undefined client causing issues in transition.
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Clearly something goes wrong with the STARTABORT transition. Actually from your
sceenshot, it is not clear why the STARTABORT transition was initiated.
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25 Feb 2021, Konstantin Olchanski, Bug Report, Unexpected end-of-file
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> > [mhttpd,ERROR] [history.cxx:97:xread,ERROR] Error: Unexpected end-of-file when
> > reading file "/home/wagasci-ana/Data/online/210219.hst"
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25 Feb 2021, Konstantin Olchanski, Forum, m is not defined error
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> I see this mhttpd error starting MSL-script:
> Uncaught (in promise) ReferenceError: m is not defined
> at mhttpd_message (VM2848 mhttpd.js:2304)
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25 Feb 2021, Konstantin Olchanski, Forum, Javascript error during run transitions.
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>
> I have also attached a screen capture of the output.
> |
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25 Feb 2021, Konstantin Olchanski, Forum, Javascript error during run transitions.
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>
> I have also attached a screen capture of the output.
>
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25 Feb 2021, Konstantin Olchanski, Forum, Javascript error during run transitions.
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>
> I have also attached a screen capture of the output.
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26 Feb 2021, Konstantin Olchanski, Bug Report, Undefined client causing issues in transition.
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So there is no error on run start anymore? To debug the stuck run stop, please use "stop -v"
to see where it got stuck. You can also play with the RPC timeouts (the connect timeout and
the response timeout), to make it get "unstuck" quicker. Definitely it should not be stuck
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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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