 20 Feb 2019, Konstantin Olchanski, Info, odb needs protection against ctrl-c
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Even with the cm_watchdog signal removed, some trouble from UNIX signals remains.
This time, when one presses Ctrl-C at the wrong time, the Ctrl-C signal handler will run at the wrong time
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 20 Feb 2019, Stefan Ritt, Info, odb needs protection against ctrl-c
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Not sure if you realized, but there is a two-stage Ctrl-C handling inside midas. The first time you hit ctrl-c, the handler just sets a flag for the main
event loop, so that the program can gracefully exit without trouble. This is
done inside cm_ctrlc_handler(), which sets _ctrlc_pressed true if called. Then cm_yield() tests this flag and returns RPC_SHUTDOWN if so. I agree not very |
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20 Feb 2019, Konstantin Olchanski, Info, odb needs protection against ctrl-c
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> Not sure if you realized, but there is a two-stage Ctrl-C handling inside midas.
Hmm... I am looking at the ctrl-c handler inside odbedit.
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20 Feb 2019, Stefan Ritt, Info, odb needs protection against ctrl-c
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Have you read what I wrote? The current ctrl-c handler just sets the _ctrlc_pressed flag. It might be that some programs do not correctly interprete the
return of cm_yield(), certainly the frontend does it correctly. On the SECOND ctrl-c, the program gets
(internally) hard aborted, equivalent to calling abort(). Not sure if the code works everywhere, I see now that cm_yield(() should maybe return SS_ABORT |
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20 Feb 2019, Konstantin Olchanski, Info, odb needs protection against ctrl-c
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Commit f81ff3c protects db_lock/unlock, but not any of the other functions. What if we do ctrl-c in the middle
of some odb write operation in the middle of memory allocation, etc.
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11 Feb 2019, Konstantin Olchanski, Info, json-rpc request for ODB /Script and /CustomScript.
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I added json-rpc requests for ODB /Script and /CustomScript (the first one shows up on the status page in the left hand side menu, the
second one is "hidden", intended for use by custom pages).
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14 Jan 2019, Becky Chislett, Bug Report, Custom script with new MIDAS
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I am having difficulty getting the custom scripts to work within the updated MIDAS. Before the
update I was using something like :
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18 Jan 2019, Konstantin Olchanski, Bug Report, Custom script with new MIDAS
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> I am having difficulty getting the custom scripts to work within the updated MIDAS. Before the
> update I was using something like :
>
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22 Jan 2019, Stefan Ritt, Bug Report, Custom script with new MIDAS
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I just check that feature and found it's still working as expected.
On trap I fell in was that a custom page needs the <input type=submit ...> to be imbedded into a pair of
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24 Jan 2019, Konstantin Olchanski, Bug Report, Custom script with new MIDAS
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> <input type=submit name=customscript value="test">
Stefan is right, input-type-submit has to be inside a form. This type of rpc call is "old school". Today, we should
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24 Jan 2019, Andreas Suter, Suggestion, json rpc API for history data
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For us it would be a handy feature if history data could be requested directly
from a custom page (time range or run based intervals) . Here I am not talking
about history plots but I am talking about recorded time series data. This way
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24 Jan 2019, Konstantin Olchanski, Suggestion, json rpc API for history data
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> For us it would be a handy feature if history data could be requested directly
> from a custom page (time range or run based intervals) . Here I am not talking
> about history plots but I am talking about recorded time series data. This way
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10 Jan 2019, Konstantin Olchanski, Info, removal of cm_watchdog()
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cm_watchdog() has been removed from the latest midas sources. The watchdog functions performed by cm_watchdog() were
moved to cm_yield() - those are - maintaining odb and event buffer "last active" timestamps and checking for and removing of
timed-out clients.
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21 Jan 2019, Konstantin Olchanski, Info, removal of cm_watchdog()
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> cm_watchdog() has been removed from the latest midas sources
> Removal of cm_watchdog() solves many problems in the midas code base:
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24 Jan 2019, Konstantin Olchanski, Info, removal of cm_watchdog()
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> > cm_watchdog() has been removed from the latest midas sources
> > Removal of cm_watchdog() solves many problems in the midas code base:
> Removal of cm_watchdog() creates new problems:
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28 Dec 2018, Konstantin Olchanski, Info, note on the midas event buffer code, part 1
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In this technical note, I write down the workings of the midas event buffer code, the path
that events travel from the frontend to the SYSTEM buffer to mlogger (and to disk).
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28 Dec 2018, Konstantin Olchanski, Info, note on the midas event buffer code, part 2, bm_send_event()
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> In this technical note, I write down the workings of the midas event buffer code
> we need to understand and write down how the event buffer code works.
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28 Dec 2018, Konstantin Olchanski, Info, note on the midas event buffer code, part 3, rpc_send_event()
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> In this technical note, I write down the workings of the midas event buffer code
> we need to understand and write down how the event buffer code works.
> bm_send_event() does this ...
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28 Dec 2018, Konstantin Olchanski, Info, note on the midas event buffer code, part 4, reading from event buffer
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> > In this technical note, I write down the workings of the midas event buffer code
> > we need to understand and write down how the event buffer code works.
> > bm_send_event() does this ...
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02 Jan 2019, Konstantin Olchanski, Info, note on the midas event buffer code, part 5, bm_read_buffer()
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> > > In this technical note, I write down the workings of the midas event buffer code
> > > we need to understand and write down how the event buffer code works.
> > > bm_send_event() does this ...
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02 Jan 2019, Konstantin Olchanski, Info, note on the midas event buffer code, part 6, reading events through the mserver
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> > > > In this technical note, I write down the workings of the midas event buffer code
> > > > we need to understand and write down how the event buffer code works.
> > > > bm_send_event() does this ...
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03 Jan 2019, Konstantin Olchanski, Info, note on the midas event buffer code, part 7, event buffer polling frequencies
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> > > > > In this technical note, I write down the workings of the midas event buffer code
> > > > > we need to understand and write down how the event buffer code works.
> > > > > bm_send_event() does this ...
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03 Jan 2019, Konstantin Olchanski, Info, note on the midas event buffer code, part 8, writer and reader communications
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> > > > > > In this technical note, I write down the workings of the midas event buffer code
Event buffer readers and writers need to communicate following information:
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10 Jan 2019, Konstantin Olchanski, Info, note on the midas event buffer code, part 8, writer and reader communications
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> > > > > > > In this technical note, I write down the workings of the midas event buffer code
> Event buffer readers and writers need to communicate following information:
>
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10 Jan 2018, Andreas Suter, Bug Report, mhttpd - custom page - RHEL/Fedora 
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Description of the problem (starting with 61be7a1):
When starting a new experiment, creating a fresh ODB and than adding the
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11 Jan 2018, Konstantin Olchanski, Bug Report, mhttpd - custom page - RHEL/Fedora
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> [mhttpd,ERROR] [mhttpd.cxx:563:rread,ERROR] Cannot read file '/root', read of
> 4096 returned -1, errno 21 (Is a directory)
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12 Jan 2018, Stefan Ritt, Bug Report, mhttpd - custom page - RHEL/Fedora
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> In any case, IMO, mhttpd has no business serving the contents of /root,
> or serving any files outside of the mhttpd user $HOME directory. (but also
> should not serve files from ~user/.ssh, or any other "secret" files, good
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26 Dec 2018, Konstantin Olchanski, Bug Report, mhttpd - custom page - RHEL/Fedora
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> > [mhttpd,ERROR] [mhttpd.cxx:563:rread,ERROR] Cannot read file '/root', read of
> > 4096 returned -1, errno 21 (Is a directory)
>
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21 Dec 2018, Stefan Ritt, Bug Report, mhttpd - custom page - RHEL/Fedora
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I implemented that fix. Thank you to Andreas. Creating "Custom" directory from the web now does
not have that problem any more.
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26 Dec 2018, Konstantin Olchanski, Bug Report, mhttpd - custom page - RHEL/Fedora
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> I implemented that fix. Thank you to Andreas. Creating "Custom" directory from the web now does
> not have that problem any more.
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27 Dec 2018, Stefan Ritt, Bug Report, mhttpd - custom page - RHEL/Fedora
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> BTW, "the fix" in mhttpd unconditionally creates /Custom/Path and sets it to the value of $MIDASSYS. This path
> seems to be prepended to all file paths, so this fix also breaks the normal use of /Custom/xxx that contain the full
> path name of the file to serve...
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27 Dec 2018, Konstantin Olchanski, Bug Report, mhttpd - custom page - RHEL/Fedora
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> I still strongly believe that mhttpd should not serve arbitrary files (only serve files explicitly listed in ODB) or as next best option,
> only serve files from subdirectories explicitly listed in ODB.
>
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05 Dec 2018, Konstantin Olchanski, Info, Partial refactoring of ODB code
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The current ODB code has several structural problems and I think I now figured out how to straighten them out.
Here is the problems:
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11 Dec 2018, Stefan Ritt, Info, Partial refactoring of ODB code
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All makes sense to me. I agree to proceed with the refactoring.
One additional comment: In the 90's when I developed this code, locking was expensive. On a decent computer you could do a couple of thousand lock operations |
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26 Dec 2018, Konstantin Olchanski, Info, Partial refactoring of ODB code
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> One additional comment: In the 90's when I developed this code, locking was expensive.
> Now the world has changed, we can do almost a million locks a second.
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27 Dec 2018, Stefan Ritt, Info, Partial refactoring of ODB code
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> I am not sure this is quite true. The CPU can execute 3000 million operations per second (3GHz CPU, assuming 1 op/Hz),
> so 1 lock operation is worth 3000 normal operations. Of course cache misses and branch mispredictions mess up
> this simple arithmetic...
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24 Sep 2018, Lars Martin, Suggestion, Self-resetting alarm class
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I was planning to use the alarm system to display an information banner when a
certain valve is open, but I would like it to go away again when the valve is
closed.
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24 Sep 2018, Lukas Gerritzen, Suggestion, Self-resetting alarm class
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If you run an external script anyway, you can also call "odbedit -c alarm" to
reset all alarms. Or you could try to set the "Triggered" entry of that certain
alarm to 0 (again, with odbedit), that could also work. |
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25 Sep 2018, Stefan Ritt, Suggestion, Self-resetting alarm class
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> If you run an external script anyway, you can also call "odbedit -c alarm" to
> reset all alarms. Or you could try to set the "Triggered" entry of that certain
> alarm to 0 (again, with odbedit), that could also work.
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26 Dec 2018, Konstantin Olchanski, Suggestion, Self-resetting alarm class
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> > If you run an external script anyway, you can also call "odbedit -c alarm" to
> > reset all alarms. Or you could try to set the "Triggered" entry of that certain
> > alarm to 0 (again, with odbedit), that could also work.
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25 Sep 2018, Stefan Ritt, Suggestion, Self-resetting alarm class
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> I was planning to use the alarm system to display an information banner when a
> certain valve is open, but I would like it to go away again when the valve is
> closed.
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24 Sep 2018, Devin Burke, Forum, Implementing MIDAS on a Satellite
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Hello Everybody,
I am a member of a satellite team with a scientific payload and I am considering
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25 Sep 2018, Stefan Ritt, Forum, Implementing MIDAS on a Satellite
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> Hello Everybody,
>
> I am a member of a satellite team with a scientific payload and I am considering
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25 Sep 2018, Devin Burke, Forum, Implementing MIDAS on a Satellite
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> > Hello Everybody,
> >
> > I am a member of a satellite team with a scientific payload and I am considering
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26 Dec 2018, Konstantin Olchanski, Forum, Implementing MIDAS on a Satellite
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>
> Thank you for your comment Stefan. We do have some hardware resources on the board such as RAM, ROM and
> Flash storage so we wouldn't necessarily have to virtualize everything. Ideally we would like a
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24 Oct 2018, Ryu Sawada, Info, bm_receive_event timeout in ROME
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Hi all
There is a bug report in the ROME repository which says bm_receive_event timeouts.
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26 Dec 2018, Konstantin Olchanski, Info, bm_receive_event timeout in ROME
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> There is a bug report in the ROME repository which says bm_receive_event timeouts.
> https://bitbucket.org/muegamma/rome3/issues/8/rome-with-midas-produces-timeout-after
> Does anybody have any ideas what could causing the problem ?
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18 Dec 2018, Konstantin Olchanski, Info, mxml update
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the mxml library was updated to make it thread-safe.
https://bitbucket.org/tmidas/mxml/src/master/
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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, Stefan Ritt, 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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02 Nov 2018, Stefan Ritt, Bug Report, Side panel auto-expands when history page updates
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> I apologise for miss using the word refresh. The re-appearing sidebar was also seen with the automatic
> reload, I have implemented your fix here and it now works great!
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02 Nov 2018, Thomas Lindner, Bug Report, Side panel auto-expands when history page updates
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> > I apologise for miss using the word refresh. The re-appearing sidebar was also seen with the automatic
> > reload, I have implemented your fix here and it now works great!
>
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02 Nov 2018, Stefan Ritt, Bug Report, Side panel auto-expands when history page updates
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> Joseph's original message says that the problem is with the standard MIDAS history page, which currently use a complete reload
> when refreshing. Of course we are planning to update this history pages to only grab what it needs (as well as changing the
> plotting to use newer HTML plotting). But until that upgrade happens your fix is helpful for the history page.
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11 Sep 2018, Francesco Renga, Forum, Launching an executable script from the sequencer
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Dear experts,
is there any way to launch an executable script on the host computer from the MIDAS
sequencer? If not, is there any interest to develop such a feature?
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11 Sep 2018, Pierre Gorel, Forum, Launching an executable script from the sequencer
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> Dear experts,
> is there any way to launch an executable script on the host computer from the MIDAS
> sequencer? If not, is there any interest to develop such a feature?
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11 Sep 2018, Stefan Ritt, Forum, Launching an executable script from the sequencer
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> > Dear experts,
> > is there any way to launch an executable script on the host computer from the MIDAS
> > sequencer? If not, is there any interest to develop such a feature?
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28 Aug 2018, Lukas Gerritzen, Bug Report, Deleting Links in ODB via mhttpd
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Asume you have a variable foo and a link bar -> foo. When you go to the ODB in
mhttpd, click "Delete" and select bar, it actually deletes foo. bar stays,
stating "<cannot resolve link>". Trying the same in odbedit with rm gives the
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28 Aug 2018, Konstantin Olchanski, Bug Report, Deleting Links in ODB via mhttpd
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> Asume you have a variable foo and a link bar -> foo. When you go to the ODB in
> mhttpd, click "Delete" and select bar, it actually deletes foo. bar stays,
> stating "<cannot resolve link>". Trying the same in odbedit with rm gives the
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29 Aug 2018, Stefan Ritt, Bug Report, Deleting Links in ODB via mhttpd
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> > Asume you have a variable foo and a link bar -> foo. When you go to the ODB in
> > mhttpd, click "Delete" and select bar, it actually deletes foo. bar stays,
> > stating "<cannot resolve link>". Trying the same in odbedit with rm gives the
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29 Aug 2018, Konstantin Olchanski, Forum, midas forum mail relay changed to smtp.triumf.ca
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Per changes at TRIUMF, the MIDAS forum mail relay was changed from trmail.triumf.ca to
smtp.triumf.ca. K.O. |
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21 Aug 2018, Wes Gohn, Bug Report, mserver problem
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Hi. We've just updated our midas installation to the newest version, and we now see repeated errors from the
mserver in messages. Mostly we see
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28 Aug 2018, Konstantin Olchanski, Bug Report, mserver problem
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> Hi. We've just updated our midas installation to the newest version, and we now see repeated errors from the
> mserver in messages. Mostly we see
>
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24 Aug 2018, Lukas Gerritzen, Forum, Int64 datatype
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I would like to store the address of 1-Wire temperature sensors in a device
driver. However, the supportet data types (as definded around
include/midas.h:311) do not foresee a type large enough.
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25 Aug 2018, Stefan Ritt, Forum, Int64 datatype
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> I would like to store the address of 1-Wire temperature sensors in a device
> driver. However, the supportet data types (as definded around
> include/midas.h:311) do not foresee a type large enough.
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28 Aug 2018, Konstantin Olchanski, Forum, Int64 datatype
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> I would like to store the address of 1-Wire temperature sensors in a device
> driver. However, the supportet data types (as definded around
> include/midas.h:311) do not foresee a type large enough.
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28 Aug 2018, Lukas Gerritzen, Forum, Problems with virtual history events
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Hi,
I am trying to set up virtual history events following
https://midas.triumf.ca/MidasWiki/index.php/History_System#Virtual_History_Event
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28 Aug 2018, Konstantin Olchanski, Forum, Problems with virtual history events
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Hi, what you try should have worked. Perhaps your symlink is wrong and should say "/External/..." (with a leading slash). The "links period" would have
worked same as equipment/common/history period - as a rate limiter.
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21 Jul 2018, Hiroaki Natori, Forum, Question about distributing event builder function on remote PC
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Dear expert,
I'm going to develop MIDAS DAQ for COMET experiment.
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23 Jul 2018, Konstantin Olchanski, Forum, Question about distributing event builder function on remote PC
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> I'm going to develop MIDAS DAQ for COMET experiment.
> I'm thinking to distribute the load of event building to different PCs.
> I attach a schematics of one of the examples of the design.
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28 Jul 2018, Hiroaki Natori, Forum, Question about distributing event builder function on remote PC
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Dear Mr. Olchanski
Thank you for your comment.
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