> > 
> > 
> > One can collapse the side panel when looking at history pages with the button in
> > the top left, great! We want to see many pages so screen real estate is important
> > 
> > The issue we face is that when the page refreshes, the side panel expands. Can
> > we make the panel state more 'sticky'?
> > 
> > Many thanks
> > Joseph (ALPHA)
> > 
> > Version: 	2.1
> > Revision: 	Mon Mar 19 18:15:51 2018 -0700 - midas-2017-07-c-197-g61fbcd43-dirty
> > on branch feature/midas-2017-10
> 
> Hi Joseph,
> 
> In principle a page refresh should now not be necessary, since pages should reload automatically 
> the contents which changes. If a custom page needs a reload, it is not well designed. If necessary, I 
> can explain the details. 
> 
> Anyhow I implemented your "stickyness" of the side panel in the last commit to the develop branch.
> 
> Best regards,
> Stefan

Hi Stefan,

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!

Thank you very much!
Joseph

> 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!

Still did not get your point. Why is there "automatic reload"? The status page should not "completely reload" any more. 
Instead, all data is fetched in the background using AJAX calls, and only the data on the page is updated once per second. If 
there is a "complete reload", something is wrong.

Stefan

> > 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!
> 
> Still did not get your point. Why is there "automatic reload"? The status page should not "completely reload" any more. 
> Instead, all data is fetched in the background using AJAX calls, and only the data on the page is updated once per second. 
If 
> there is a "complete reload", something is wrong.

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.

> 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.

Ok, now I understand, and of course I agree with you.

Stefan

Hello,

Just did a fresh install of MIDAS from the SVN repository under CentOS and
everything compiles fine, but when I go to run the frontend (using dio), I get
the following error message:

Connect to experiment ...[odb.c:868:db_open_database] Different database format:
 Shared memory is 14, program is 2
[midas.c:1763:cm_connect_experiment1] cannot open database


Any ideas on what the problem could be, or how to fix it?  


~Steve

> Hello,
> 
> Just did a fresh install of MIDAS from the SVN repository under CentOS and
> everything compiles fine, but when I go to run the frontend (using dio), I get
> the following error message:
> 
> Connect to experiment ...[odb.c:868:db_open_database] Different database format:
>  Shared memory is 14, program is 2
> [midas.c:1763:cm_connect_experiment1] cannot open database
> 
> 
> Any ideas on what the problem could be, or how to fix it?  

You have an old .ODB.SHM from a previous version in your directoy (note the '.' in
front, so you need a 'ls -alg' to see it). Delete that file and try again.

Thanks for your help.  I tried again and it got me back to the initial problem I had.
 The frontend will start, and the analyzer starts (complains about there not being a
last.root, but other than that it's fine), and then when starting mlogger, I get:

[odb.c:860:db_validate_db] Warning: database corruption, first_free_key 0x0001A4
04
[odb.c:3666:db_get_key] invalid key handle
[midas.c:1970:cm_check_client] cannot delete client info
[odb.c:3666:db_get_key] invalid key handle
[midas.c:1970:cm_check_client] cannot delete client info
[odb.c:3666:db_get_key] invalid key handle


And it continues to shoot out error messages about invalid key handles until I kill
it.  Then trying to start the frontend again fails until I remove the .ODB.SHM file. 
Any other ideas?

> > Hello,
> > 
> > Just did a fresh install of MIDAS from the SVN repository under CentOS and
> > everything compiles fine, but when I go to run the frontend (using dio), I get
> > the following error message:
> > 
> > Connect to experiment ...[odb.c:868:db_open_database] Different database format:
> >  Shared memory is 14, program is 2
> > [midas.c:1763:cm_connect_experiment1] cannot open database
> > 
> > 
> > Any ideas on what the problem could be, or how to fix it?  
> 
> You have an old .ODB.SHM from a previous version in your directoy (note the '.' in
> front, so you need a 'ls -alg' to see it). Delete that file and try again.

That sounds like you mix versions: You have an old executable (maybe your mlogger) which
has been linked against the old midas version, but you create the ODB with the new
odbedit or frontend. The new version complains if it finds an ODB from a previous version
(the error you reported first), but an old program does not have that version check, so
it finds a different binary ODB structure and crashes.

> Thanks for your help.  I tried again and it got me back to the initial problem I had.
>  The frontend will start, and the analyzer starts (complains about there not being a
> last.root, but other than that it's fine), and then when starting mlogger, I get:
> 
> [odb.c:860:db_validate_db] Warning: database corruption, first_free_key 0x0001A4
> 04
> [odb.c:3666:db_get_key] invalid key handle
> [midas.c:1970:cm_check_client] cannot delete client info
> [odb.c:3666:db_get_key] invalid key handle
> [midas.c:1970:cm_check_client] cannot delete client info
> [odb.c:3666:db_get_key] invalid key handle
> 
> 
> And it continues to shoot out error messages about invalid key handles until I kill
> it.  Then trying to start the frontend again fails until I remove the .ODB.SHM file. 
> Any other ideas?
> 
> > > Hello,
> > > 
> > > Just did a fresh install of MIDAS from the SVN repository under CentOS and
> > > everything compiles fine, but when I go to run the frontend (using dio), I get
> > > the following error message:
> > > 
> > > Connect to experiment ...[odb.c:868:db_open_database] Different database format:
> > >  Shared memory is 14, program is 2
> > > [midas.c:1763:cm_connect_experiment1] cannot open database
> > > 
> > > 
> > > Any ideas on what the problem could be, or how to fix it?  
> > 
> > You have an old .ODB.SHM from a previous version in your directoy (note the '.' in
> > front, so you need a 'ls -alg' to see it). Delete that file and try again.

Hello midas'ers,

Today I discovered a severe bug in the routine bm_check_buffers(), which
causes the logger to crash when it stops a run due to a reached event limit.
The funny thing is that this bug was there since the beginning, but only
recent versions of gcc and libc reveal it.

Since I consider this severe, I fixed it and updated 1.9.4 just now. I did
not go with 1.9.4-1, but maybe in future we should consider patch levels.

So please everybody who uses 1.9.4 and has problems with crashing loggers,
please update to 1.9.4 from today (July 15th, 2004).

- Stefan

I committed several small fixes and changes:

- install.txt which mentions explicitly ROOT
- mana.c and the main Makefile which fixes all HBOOK compiler warnings
- mana.c to write an explicit warning if the experiment directoy contains 
uppercase letters in the path (HBOOK does not like this and refuses to 
read/write histos)
- mserver.c, mrpc.c, odb.c to fix a wrong parameter in 
db_remove_open_record() (see previous entry from Paul)
- added experim.h into the dependency of the hbookexpt Makefile

We are new to MIDAS and try to setup a simple system with one ortec camac ADC
AD413A and the hytec1331 controler. Has anyone used this module in MIDAS we
would be grateful for the corresponding frontend.c etc. 

It would be very useful to have somewhere examples of files used by various
experiments in addition to the example files provided in the installation.

Best regards,
Hans 

I'm trying to setup Midas with the Caen vx2740 VME digitizer board.
As the backend driver I used the software from Darkside located here:

https://bitbucket.org/ttriumfdaq/dsproto_vx2740/src/develop/

They implemented some helpers program and one from them should diagnose correct running of digitizer. But when I'm trying to run example program "vx2740_readout_test" I have segmentation fault:

Thread 1 "vx2740_readout_" received signal SIGSEGV, Segmentation fault.
0x00005555555c2ee1 in rpc_register_function (id=id@entry=18000, func=func@entry=0x5555555a2790 <jrpc_helper(int, void**)>) at /home/astrocent/workspace/packages/midas/src/midas.cxx:11947

During the calling this program I have running mhttpd, mlogger and the backend for vx2740 from the repository.

I'm not able to find documentation what is purpose of the RPC? Could someone give any indicators how I can start debug this behavior? Or there is some documentation about the RPC?


I'm freshman in the Midas world, so at this moment everything seems for me very complicated - and I'm learning by doing.

Regards,
Grzegorz

The backtrace from gdb which indicates the function in Midas package:

#0  0x00005555555c2ee1 in rpc_register_function (id=id@entry=18000, func=func@entry=0x5555555a2790 <jrpc_helper(int, void**)>)
    at /home/astrocent/workspace/packages/midas/src/midas.cxx:11947
#1  0x00005555555c2f12 in cm_register_function (id=id@entry=18000, func=func@entry=0x5555555a2790 <jrpc_helper(int, void**)>)
    at /home/astrocent/workspace/packages/midas/src/midas.cxx:5840
#2  0x00005555555a26f6 in VX2740GroupFrontend::init (this=this@entry=0x7fffffffcba0, group_idx=group_idx@entry=-1, hDB=hDB@entry=0, enable_jrpc=enable_jrpc@entry=true)
    at /home/astrocent/workspace/packages/ttriumfdaq-dsproto_vx2740-8122058cacd1/vx2740_fe_class.cxx:134
#3  0x000055555557e492 in do_fe (board_name=..., is_scope=<optimized out>) at /home/astrocent/workspace/packages/ttriumfdaq-dsproto_vx2740-8122058cacd1/vx2740_readout_test.cxx:185
#4  0x000055555557adc9 in main (argc=<optimized out>, argv=0x7fffffffd1f8) at /home/astrocent/workspace/packages/ttriumfdaq-dsproto_vx2740-8122058cacd1/vx2740_readout_test.cxx:253

> I'm not able to find documentation what is purpose of the RPC? Could someone give any indicators how I can start debug this behavior? Or there is some documentation about the RPC?

The RPC system allows midas clients to issue commands to each other. In the case of the VX2740 code we use it so the midas webserver (mhttpd) can tell the frontend to perform some actions when a user clicks a button on a webpage.

I've been writing most of the code for the VX2740 for Darkside, so will contact you directly to help debug the issue.

> I'm trying to setup Midas with the Caen vx2740 VME digitizer board.

welcome to the world of daq and midas! Ben already answered and he will help you with this specific hardware. (we work together)

> #0  0x00005555555c2ee1 in rpc_register_function (id=id@entry=18000, func=func@entry=0x5555555a2790 <jrpc_helper(int, void**)>)
>     at /home/astrocent/workspace/packages/midas/src/midas.cxx:11947

I look at this line in midas and I do not see any problems other than all functions that touch rpc_list are not thread safe,
and calling them at the same time as rpc calls are active will cause memory corruption and crash. This is not a problem
in most programs because rpc_register_function() is usually called once at the beginning of everything, before any RPCs
are received, sent or processed. I filed a bug against this problem. https://bitbucket.org/tmidas/midas/issues/362/rpc_list-is-not-thread-safe

> with is "jrpc"?

I implemented it years ago to allow web pages to call mhttpd (XHR/HTTP) to call user frontends (MIDAS RPC) to perform real-time actions,
i.e. to turn power supplied on or off. "j" stands for "json", but most experiments send very simple commands
and do not use json encoding.

K.O.

I am using the Midas sequencer to run subsequent measurements in a loop, without 
knowing how many iterations in advance. Therefore, I am using the "infinity" 
option. Since I have other commands after the loop, it would be nice to have the 
possibility to break the loop, but let the sequencer then finish the rest of the 
commands. 
Cheers,
Ivo

> I am using the Midas sequencer to run subsequent measurements in a loop, without 
> knowing how many iterations in advance. Therefore, I am using the "infinity" 
> option. Since I have other commands after the loop, it would be nice to have the 
> possibility to break the loop, but let the sequencer then finish the rest of the 
> commands. 
> Cheers,
> Ivo

You can do that with the "GOTO" statement, jumping to the first line after the loop.

Here is a working example:


LOOP runs, 5
     WAIT Seconds 3
     IF $runs > 2
         GOTO 7
     ENDIF
ENDLOOP
MESSAGE "Finished", 1

Best,
Stefan

> You can do that with the "GOTO" statement, jumping to the first line after the loop.
> 
> Here is a working example:
> 
> 
> LOOP runs, 5
>      WAIT Seconds 3
>      IF $runs > 2
>          GOTO 7
>      ENDIF
> ENDLOOP
> MESSAGE "Finished", 1
> 
> Best,
> Stefan

Hoi Stefan

Thanks for your answer. As I understand it, this has to be in the sequence script before 
running. So, in the end, it is not different than just saying "LOOP runs, 2" and 
therefore the number of runs has do be known in advance as well. Or is there an option to 
change the script on runtime? What I would like, is to start a sequence with "LOOP runs, 
infinite" and when I come back to the experiment after falling asleep being able to break 
the loop after the next iteration, but still execute everything after ENDLOOP, i.e. the 
MESSAGE statement in your example. Because if I do a "Stop after current run", this seems 
not to happen. 

Best, Ivo

> > You can do that with the "GOTO" statement, jumping to the first line after the loop.
> > 
> > Here is a working example:
> > 
> > 
> > LOOP runs, 5
> >      WAIT Seconds 3
> >      IF $runs > 2
> >          GOTO 7
> >      ENDIF
> > ENDLOOP
> > MESSAGE "Finished", 1
> > 
> > Best,
> > Stefan
> 
> Hoi Stefan
> 
> Thanks for your answer. As I understand it, this has to be in the sequence script before 
> running. So, in the end, it is not different than just saying "LOOP runs, 2" and 
> therefore the number of runs has do be known in advance as well. Or is there an option to 
> change the script on runtime? What I would like, is to start a sequence with "LOOP runs, 
> infinite" and when I come back to the experiment after falling asleep being able to break 
> the loop after the next iteration, but still execute everything after ENDLOOP, i.e. the 
> MESSAGE statement in your example. Because if I do a "Stop after current run", this seems 
> not to happen. 
> 
> Best, Ivo

First, you have the sequencer button "Stop after current run", but that does of course ot
execute anything after ENDLOOP. 

Second, you can put anything in the IF statement. Like create a variable on the ODB like
/Experiment/Run parameters/Stop loop and set this to zero. Then put in your script:

...
ODBGET /Experiment/Run parameters/Stop loop, flag
IF $flag == 1
   GOTO 7
...

So once you want to stop the loop, set the flag in the ODB to one.

Best,
Stefan

> LOOP runs, 5
> ...
> ENDLOOP

Classical loop constructs usually include "break" (exit the loop) and "continue" (loop again!) 
constructs. I would say it is an unfortunate omission if they are not present in the midas sequencer.

But Stefan is right, of course, both commands are just funny names for "goto".

K.O.

While I know some of those limits/problems have been already been reported from
DEAP (and maybe corrected in the last version), I am recording them here:

Bugs (not working as it should): 
- "SCRIPT" does not seem to take the parameters into account
- The operators for WAIT are incorrectly set:
the default ">=" and ">" are correct, but "<=", "<", "==" and "!=" are all using
">=" for the test. 

Possible improvements:
- in LOOP, how can I get the index of the LOOP? I used an extra variable that I
increment, but it there a better way?
- PARAM is giving "string" (or a bool) whose size is set by the user input. The
side effect is that if I am making a loop starting at "1", the incrementation
will loop at "9" -> "1". If I start at "01", the incrementation will give "2.",
"3.",... "9.", "10"... The later is probably what most people would use.
- ODBGet (and ODBSet?) does seem to be able to take a variable as a path... I
was trying to use an array whose index would be incremented.