> Is there now some other mechanism to hide the start and stop buttons?
> Note that this is for a pure slow control system that does not take runs.

Just wanted to add that I realize that this can be done by copying
status.html and/or midas.css to the experiment directory and then modifying
them/it, but wonder if the is some other preferred way.

Hi Stefan,

> Indeed the ODB settings are obsolete.

I just applied for an account for the wiki.
I'll try add a note regarding this change.

> Now that the status page is fully dynamic 
> (JavaScript), it's much more powerful to modify the status.html page directly. You 
> can not only hide the buttons, but also remove the run numbers, the running time, 
> and so on. This is much more flexible than steering things through the ODB.

Very true. Currently I copied the resources/midas.css into the experiment directory and appended:

#runNumberCell { display: none;}
#runStatusStartTime { display: none;}
#runStatusStopTime { display: none;}
#runStatusSequencer { display: none;}
#logChannel { display: none;}

See screenshot attached. :-)

But if feels a little clunky to copy the whole file just to add five lines.
It might be more elegant if status.html looked for a user css file in addition
to the default ones.

> If there is a general need for that, I can draft a "non-run" based status page, but 
> it's a bit hard to make a one-fits-all. Like some might even remove the logging 
> channels and the clients, but add certain things like if their slow control front-
> end is running etc.

The logging channels are easily removed with the css (see attachment), but it might be
nice if the string "Run Status" table title was also configurable by css. For this
slow control system I'd probably change it to something like "GSC Status". Again
this is a minor thing, I could trivially do this by copying the resources/status.html
to the experiment directory and editing it.

Lots of fun new stuff migrating from circa 2012 midas to midas-2022-05-c :-)

Cheers,

Nick.

Hi

> > > Indeed the ODB settings are obsolete.
> > 
> > I just applied for an account for the wiki.
> > I'll try add a note regarding this change.
> 
> Please coordinate with Ben Smith at TRIUMF <bsmith@triumf.ca>, who coordinates the documentation. 

I will tread lightly. 

> I would not go to change the CSS file. You only can hide some tables. But in a while I'm sure you
> want to ADD new things, which you only can do by editing the status.html file. You don't have to
> change midas/resources/status.html, but can make your own "custom status", name it differently, and
> link /Custom/Default in the ODB to it. This way it does not get overwritten if you pull midas.

We have *many* custom pages. The submenus on the status page:

&#9656; FGD
&#9656; TPC
&#9656; TRIPt

hide custom pages with all sorts of good stuff.

> > The logging channels are easily removed with the css (see attachment), but it might be
> > nice if the string "Run Status" table title was also configurable by css. For this
> > slow control system I'd probably change it to something like "GSC Status". Again
> > this is a minor thing, I could trivially do this by copying the resources/status.html
> > to the experiment directory and editing it.
> 
> See above. I agree that the status.html file is a bit complicated and not so easy to understand
> as the CSS file, but you can do much more by editing it.

I may end up doing this since the events and data columns do not provide particularly
useful information in this instance. But for now, the css route seems like a quick and
fairly clean way to remove irrelevant stuff from a prominent place at the top of the page.
 
> > Lots of fun new stuff migrating from circa 2012 midas to midas-2022-05-c :-)
> 
> I always advise people to frequently pull, they benefit from the newest features and avoid the
> huge amount of work to migrate from a 10 year old version.

The long delay was not my choice. The group responsible for the system departed in 2018, and
and were not replaced by the experiment management. Lack of personnel/expertise resulted in
a "if it's not broken then don't fix it" situation. Eventually, the need to update the PCs/OSs
and the imminent introduction of new sub-detectors resulted people agreeing to the update. 

Cheers,

Nick.

Hi,

> What's the best way to make these messages go away? 
1.
> - Change the logic in db_validate_and_repair_key_wlocked() to not worry if keys are 10+ years old? 
2.
> - Write a script to "touch" all the old keys so they've been modified recently?
3.
> - Something else?

I wondered about this just under a year ago, and Konstantin forwarded my query here:
https://daq00.triumf.ca/elog-midas/Midas/2470

I am now of the opinion that 2 is not a good approach since it removes potentially
useful information.

I think some version of 1. is the correct choice. Whatever it fix is, I think it
should not care that timestamps of when variables are set are "old" (or at least
it should be user configurable via some odb setting).

Nick.

Dear Midas experts,

I noticed that a check was added to mfe.cxx in 1961af0d6:

+      /* check for consistent common settings */
+      if ((eq_info->read_on & RO_STOPPED) &&
+          (eq_info->eq_type == EQ_POLLED ||
+           eq_info->eq_type == EQ_INTERRUPT ||
+           eq_info->eq_type == EQ_MULTITHREAD ||
+           eq_info->eq_type == EQ_USER)) {
+         cm_msg(MERROR, "register_equipment", "Events \"%s\" cannot be read when run is stopped (RO_STOPPED flag)", equipment[idx].name);
+         return 0;
+      }

This commit was by Stefan in May 2022.

A commit few days later, 28d9c96bd, removed the "return 0;", and updated the
error message to:

"Equipment \"%s\" contains RO_STOPPED or RO_ALWAYS. This can lead to undesired side-effect and should be removed."

So such FEs can run but there is still an error at start up. The 
documentation at https://daq00.triumf.ca/MidasWiki/index.php/ReadOn_Flags
states with RO_STOPPED "Readout Occurs" "Before stopping run".
Which seems to indicate that the removing the RO_STOPPED bit from a SC FE
would just result in an additional read not happening just prior to a run
stop. However reading scheduler() in mfe.cxx I see in the the main loop:

 if (run_state == STATE_STOPPED && (eq_info->read_on & RO_STOPPED) == 0) 
    continue;

So it seems to me that the a EQ_PERIODIC equipment needs RO_STOPPED to be set
otherwise it will not read out data while there is no DAQ run.

Can someone explain the purpose of this check and error message? Perhaps it
was put in place with only DAQ FEs, not SC FEs in mind? And should the 
documentation in the wiki actually be "s/Before stopping run/While run is stopped/"?

Thanks,

Nick.

I think this may only be an issue on the development branch.
Can you confirm that that is what you are using?

If so, I suggest you try the most recent stable tag 2022-05-c.

> Dear experts,
> I am a new user of MIDAS. I try to follow the instruction from 
> https://daq00.triumf.ca/MidasWiki/index.php/Quickstart_Linux
> to install MIDAS in Fedora 39.
> 
> When I try to have a try in the section of "Clients run on Localhost only"
> https://daq00.triumf.ca/MidasWiki/index.php/Quickstart_Linux#Clients_run_on_Localhost_only
> 
> I get the error of "undefined reference to" several variables in the mfe.cxx. For example the variable "max_event_size_frag". May I know any idea about this issue? Thank you.
> 
> 
> Best,
> Terry

I just discovered https://bitbucket.org/tmidas/midas/issues/338/mfec-ro_stopped-is-now-forbidden

> Dear Midas experts,
> 
> I noticed that a check was added to mfe.cxx in 1961af0d6:
> 
> +      /* check for consistent common settings */
> +      if ((eq_info->read_on & RO_STOPPED) &&
> +          (eq_info->eq_type == EQ_POLLED ||
> +           eq_info->eq_type == EQ_INTERRUPT ||
> +           eq_info->eq_type == EQ_MULTITHREAD ||
> +           eq_info->eq_type == EQ_USER)) {
> +         cm_msg(MERROR, "register_equipment", "Events \"%s\" cannot be read when run is stopped (RO_STOPPED flag)", equipment[idx].name);
> +         return 0;
> +      }
> 
> This commit was by Stefan in May 2022.
> 
> A commit few days later, 28d9c96bd, removed the "return 0;", and updated the
> error message to:
> 
> "Equipment \"%s\" contains RO_STOPPED or RO_ALWAYS. This can lead to undesired side-effect and should be removed."
> 
> So such FEs can run but there is still an error at start up. The 
> documentation at https://daq00.triumf.ca/MidasWiki/index.php/ReadOn_Flags
> states with RO_STOPPED "Readout Occurs" "Before stopping run".
> Which seems to indicate that the removing the RO_STOPPED bit from a SC FE
> would just result in an additional read not happening just prior to a run
> stop. However reading scheduler() in mfe.cxx I see in the the main loop:
> 
>  if (run_state == STATE_STOPPED && (eq_info->read_on & RO_STOPPED) == 0) 
>     continue;
> 
> So it seems to me that the a EQ_PERIODIC equipment needs RO_STOPPED to be set
> otherwise it will not read out data while there is no DAQ run.
> 
> Can someone explain the purpose of this check and error message? Perhaps it
> was put in place with only DAQ FEs, not SC FEs in mind? And should the 
> documentation in the wiki actually be "s/Before stopping run/While run is stopped/"?
> 
> Thanks,
> 
> Nick.

Dear all,

I have problem in event buffer size.

When run MIDAS, I got error "total event size (1307072) larger than buffer size
(1048576)", so I guess that the EVENT_BUFFER_SIZE is small.

I change EVENT_BUFFER_SIZE in midas.h from 0x100000 to 0x200000. After compiling
and run MIDAS, I got other error "Shared memory segment with key 0x4d040761
already exists, please remove it manually: ipcrm -M 0x4d040761 size0x204a3c" in
system.C

I check the shmget() function in system.C and it is said that error come from
Shared memory segments larger than 16,773,120 bytes and create teraspace shared
memory segments

Anyone has this problem before?
Thanks for your help

M.T

Dear all,

I have problem in event buffer size.

When run MIDAS, I got error "total event size (1307072) larger than buffer size
(1048576)", so I guess that the EVENT_BUFFER_SIZE is small.

I change EVENT_BUFFER_SIZE in midas.h from 0x100000 to 0x200000. After compiling
and run MIDAS, I got other error "Shared memory segment with key 0x4d040761
already exists, please remove it manually: ipcrm -M 0x4d040761 size0x204a3c" in
system.C

I check the shmget() function in system.C and it is said that error come from
Shared memory segments larger than 16,773,120 bytes and create teraspace shared
memory segments

Anyone has this problem before?
Thanks for your help

M.T

I am sorry for my late reply memory in my PC is 16 GB I check the contents of .SHM_TYPE.TXT and it is "POSIXv2_SHM". But there is no buffer sizes in "/Experiment" After run "ipcrm -M 0x4d040761 size0x204a3c", remove .SYSTEM.SHM and run MIDAS again, I still get error "Shared memory segment with key 0x4d040761 already exists, please remove it manually: ipcrm -M 0x4d040761 size0x204a3c" M.T

I am sorry for my late reply 

memory in my PC is 16 GB 

I check the contents of .SHM_TYPE.TXT and it is "POSIXv2_SHM". 
But there is no buffer sizes in "/Experiment" 

After run "ipcrm -M 0x4d040761 size0x204a3c", remove .SYSTEM.SHM and run MIDAS again, I still get error "Shared memory segment
with key 0x4d040761 already exists, please remove it manually: ipcrm -M 0x4d040761 size0x204a3c" M.T

Please, tell me how to choose a value of a "key" like DCM, pulser period,
presamples, upper thresholds to run a experiment? where can I find the related
informations? 

Hello there,

I am working on a task that involves some ODB changes that happen within 20-500 
ms. The wait command for Midas Sequencer only works for > 1 second. As a 
workaround, I tried calling a python script that has a time.sleep() command, but 
the sequencer doesn't wait for the python script to terminate before moving to the 
next command. Obviously, I could just move the entire script to python, but that 
would cause further issues to us. Is there a way to have a wait that has precision 
in order of milliseconds from within the Midas Sequencer? If there is no Midas-
native methods for doing this, what workaround will you suggest to get this to 
work?

> > Ok, I implemented the float second wait function. Internally it works in ms, so the maximum resolution is 0.001 s.
> > 
> > Best,
> > Stefan
> 
> Thank you, we will test this soon and let you know if we see any issues (but we're not expecting any).

Hello Stefan,

Thank you for the help you provided for us so far. I tried your code changes on our midas fork. Now, I notice that any 
wait command takes at least 0.2 seconds to run. 

For example, when I use the following script:
SCRIPT source scripts/time_print.sh
WAIT Seconds, 0.1
SCRIPT source scripts/time_print.sh
WAIT Seconds, 0.1
SCRIPT source scripts/time_print.sh

The time_print.sh script prints time segments separated by almost exactly 0.2 seconds. Same goes for when I use 0.01 
second waits.

However, when I use 0.2 seconds wait, then I get time segments separated by 0.3 seconds. I also tried something like 
this:
SCRIPT source scripts/time_print.sh
WAIT Seconds, 0.2
WAIT Seconds, 0.2
SCRIPT source scripts/time_print.sh
WAIT Seconds, 0.2
WAIT Seconds, 0.2
SCRIPT source scripts/time_print.sh

This script results in time segements of 0.6 seconds difference. It is not immidiately clear to me from the sequencer 
code what causes this effect. The code as it stands is a lot better than what we had before the changes, but I am 
wondering if this can be reduced to the order of 1ms or 10ms.

Best regards,
Musaab Faozi

> Actually I realized that a 1ms wait still works, so I reduced it to that.
> 
> Stefan

Thank you so much, Stefan. I have tested your changes, and it seems like this does 
the job for our purposes. Very appreciated!

Best regards,
Musaab Faozi

In midas.c, the bk_delete function removes a bank by decrementing the total
event size and then copying the remaining banks into the location of the first
using memcpy from string.h.

memcpy is not specified to handle overlapping memory regions (such as MIDAS
banks), though it seems most common implementations do.

memmove should be used instead, which is specified to behave as if copying
through an intermediate buffer.

I noticed the misbehavior using glibc with gcc version 4.4.4 and scientific
linux 6.0. Other gcc versions changed nothing, as this originates from the
implementation of memcpy in libc.

libc version:
GNU C Library stable release version 2.12, by Roland McGrath et al.
Compiled by GNU CC version 4.4.5 20110214 (Red Hat 4.4.5-6).
Compiled on a Linux 2.6.32 system on 2011-12-06.

I am using the MSCB SCS2000 to monitor slow control variables (temperatures, voltages, etc). I am trying to 
get it set up at fermilab as a test stand in the MC1 building and was wondering if anyone has integrated 
Midas with a MSCB SCS2000 before. We have two systems at fermilab, one system that is currently running 
in the g-2 experimental hall, but running an out of date version of midas. The second test stand I am 
setting up is working with the current version of midas. I believe we will easily be able to figure out the 
external probes for temperatures and voltages just fine. But the MSCB SCS2000 box itself has 1 
temperature value, 1 current value, and 5 voltages internally that we also need to monitor. If I use the msc 
command I can read back the external values through the daughter cards I have installed on the SCS2000 
box but has no way of reading back the internal values that I need. I also have been looking through the 
MIDAS files trying to find a possible way to read these out to no avail.

If anyone has any ideas or has had previous work with the SCS2000 and knows how to read back the 
internal values please let me know. 

Thanks,

Michael McEvoy
NIU Graduate Student

As the Midas software is installed using CMake, it can be easily integrated into 
other CMake projects using the MidasConfig.cmake file produced during the Midas 
installation.

This file points to the location of the include and libraries of Midas using three 
variables:
- MIDAS_INCLUDE_DIRS
- MIDAS_LIBRARY_DIRS
- MIDAS_LIBRARIES

Then the CMakeLists file of the new project can use the CMake find_package 
functionalities like:
```
find_package (Midas REQUIRED)
if (MIDAS_FOUND)
    MESSAGE(STATUS "Found midas: libraries ${MIDAS_LIBRARIES}")
    pbuilder_add_ext_libraries (${MIDAS_LIBRARIES})
else (MIDAS_FOUND)
    message(FATAL "Unable to find midas")
endif (MIDAS_FOUND)
include_directories (${MIDAS_INCLUDE_DIR})
```
pbuilder_add_ext_libraries is a CMake macro allowing to automatically add the 
libraries into the project: this macro can be found here: 
https://github.com/project8/scarab/blob/master/cmake/PackageBuilder.cmake
If such macro doesn't exist, the linkage to each executable/library can be done 
similarly to https://midas.triumf.ca/elog/Midas/1964 using: 

```
target_link_libraries(crfe ${MIDAS_LIBARIES} ${LIBS})
```

The current version of the MidasConfig.cmake is minimal and could for example 
include a version number: this would allow to define a e.g. minimal version of 
Midas needed by the new project.

Hi,

Using midas version 12-2020,  I am trying to run mhttpd from within a docker container using docker-compose.
Starting from an empty ODB, I simply run `mhttpd` and this is the output I have:
midas_hatfe_1  | <Warning> Starting mhttpd...
midas_hatfe_1  | [mhttpd,INFO] ODB subtree /Runinfo corrected successfully
midas_hatfe_1  | MVOdb::SetMidasStatus: Error: MIDAS db_find_key() at ODB path "/WebServer/Host list" returned status 312
midas_hatfe_1  | Mongoose web server will not use password protection
midas_hatfe_1  | Mongoose web server will not use the hostlist, connections from anywhere will be accepted
midas_hatfe_1  | Mongoose web server listening on http address "localhost:8080", passwords OFF, hostlist OFF
midas_hatfe_1  | [mhttpd,ERROR] [mhttpd.cxx:19160:mongoose_listen,ERROR] Cannot mg_bind address "[::1]:8080"

According to the documentation, the WebServer tree should be created automatically when starting the mhttpd; but it seems not as it doesn't find the entry "/WebServer/Host list".
If I create it by end (using "create STRING /WebServer/Host list"), I still get the error message that mhttpd didn't bind properly to the local port 8080.
I am not sure what it wrong, as mhttpd is working perfectly well in this exact container for midas 03-2020.

Any idea what difference makes it not possible anymore to run into these container?

Thanks very much for your help.
Cheers
Mathieu

> > It looks like mhttpd managed to bind to the IPv4 address (localhost), but not the IPv6 address (::1). If you don't need it, try setting "/Webserver/Enable IPv6" to false.
> 
> We had this issue already several times. This info should be put into the documentation at a prominent location.
> 
> Stefan

Thanks a lot, this solved my issue!