Dear MIDAS users,

We would like to announce another MIDAS workshop at TRIUMF on July 26, 2017. 
This will be a follow-on to the successful workshop two years ago.  This
workshop will again be during one of Stefan Ritt's visit to TRIUMF.

The goal of the workshop would be to have a general discussion on the state of
MIDAS.  We would have presentations from MIDAS developers on new MIDAS features
that are being implemented, with a particular focus on improvements to MIDAS web
functionality and analyzers.  But equally important would be to hear the
experiences of MIDAS users. What aspects of MIDAS work well?  Which aspects need
improving?  What are the major trends in scientific computing that we should
adapt to?  We always appreciate feedback and suggestions from the MIDAS
community (even when we have trouble finding time to make the changes!)

We will naturally broadcast the workshop on the web, but it would also be great
if anyone was interested in coming to TRIUMF in person to participate.

Thomas, on behalf of MIDAS developers

Hello,

I am using a CAEN v1720 to digitise signal coming from 5 PMTs and I need to extend the read-
out window to 1ms.

Given the sampling frequency of 250 MHz, each event would consist of about 4.78 MB

Accordingly to the documentation I found in:

https://midas.triumf.ca/MidasWiki/index.php/Event_Buffer

 - I modified the value of ODB /Experiment/MAX_EVENT_SIZE to 8 MB (I overestimated it in case 
I will readout all 8 channels of the v1720)
 - I modified the ODB key /Experiment/Buffer Sizes/SYSTEM to 512 MB (which allow to contain 
about 100 events in the buffer)

The max_event_size in the frontend source code is set to 32 MB while the event_buffer size is 
200 times the max_event_size. So I did not modify those values.

When I start a new run, the MIDAS crash and the ODB gets corrupted:

$ odbedit 
[ODBEdit,ERROR] [odb.c:1134:db_open_database,ERROR] Different database format: Shared 
memory is 262148000, program is 3
[ODBEdit,ERROR] [midas.c:2157:cm_connect_experiment1,ERROR] cannot open database
Unexpected error #326

Do you have any idea of what might be the problem?

The same thing happen if I reduce the buffer size to 128 MB.

The computer running MIDAS has 2 Quad CPU @ 2.83GHz and 4 GB RAM.

Thank you in advance for any help!
Alberto

Dear MIDAS users,

We have an approximately final agenda for the MIDAS workshop in two weeks.  The
workshop will be on July 26, from 1-6PM (Vancouver time).  The detailed agenda is
posted here:

https://indico.triumf.ca/conferenceDisplay.py?confId=2342

Next week I will provide details on how to remotely connect to the workshop.

Cheers,
Thomas

PS: as a reminder, the timetable and slides from the last MIDAS workshop can be
found here:

https://indico.psi.ch/conferenceTimeTable.py?confId=3793#20150715



> Dear MIDAS users,
> 
> We would like to announce another MIDAS workshop at TRIUMF on July 26, 2017. 
> This will be a follow-on to the successful workshop two years ago.  This
> workshop will again be during one of Stefan Ritt's visit to TRIUMF.
> 
> The goal of the workshop would be to have a general discussion on the state of
> MIDAS.  We would have presentations from MIDAS developers on new MIDAS features
> that are being implemented, with a particular focus on improvements to MIDAS web
> functionality and analyzers.  But equally important would be to hear the
> experiences of MIDAS users. What aspects of MIDAS work well?  Which aspects need
> improving?  What are the major trends in scientific computing that we should
> adapt to?  We always appreciate feedback and suggestions from the MIDAS
> community (even when we have trouble finding time to make the changes!)
> 
> We will naturally broadcast the workshop on the web, but it would also be great
> if anyone was interested in coming to TRIUMF in person to participate.
> 
> Thomas, on behalf of MIDAS developers

Dear MIDAS colleagues,

We will use Zoom for people making remote connections to the MIDAS workshop next week.  The connection details 
are shown below.  You will need to install a Zoom application, which should happen automatically when clicking on the 
first link below.  It seemed to work pretty easily for me.

Cheers,
Thomas
 
_________________________________________

Hi there,

Thomas Lindner is inviting you to a scheduled Zoom meeting.

Topic: MIDAS workshop
Time: Jul 26, 2017 12:30 PM Pacific Time (US and Canada)

Join from PC, Mac, Linux, iOS or Android: https://zoom.us/j/749477537?pwd=-TSKYSiS0_k
    Password: midas

Or iPhone one-tap (US Toll):  +16465588656,,749477537# or +14086380968,,749477537#

Or Telephone:
    Dial: +1 646 558 8656 (US Toll) or +1 408 638 0968 (US Toll)
    Meeting ID: 749 477 537
    International numbers available: https://zoom.us/zoomconference?m=0Bug-COhDHYndpVqRLnNST9H-uXrauWk




> Dear MIDAS users,
> 
> We have an approximately final agenda for the MIDAS workshop in two weeks.  The
> workshop will be on July 26, from 1-6PM (Vancouver time).  The detailed agenda is
> posted here:
> 
> https://indico.triumf.ca/conferenceDisplay.py?confId=2342
> 
> Next week I will provide details on how to remotely connect to the workshop.
> 
> Cheers,
> Thomas
> 
> PS: as a reminder, the timetable and slides from the last MIDAS workshop can be
> found here:
> 
> https://indico.psi.ch/conferenceTimeTable.py?confId=3793#20150715
> 
> 
> 
> > Dear MIDAS users,
> > 
> > We would like to announce another MIDAS workshop at TRIUMF on July 26, 2017. 
> > This will be a follow-on to the successful workshop two years ago.  This
> > workshop will again be during one of Stefan Ritt's visit to TRIUMF.
> > 
> > The goal of the workshop would be to have a general discussion on the state of
> > MIDAS.  We would have presentations from MIDAS developers on new MIDAS features
> > that are being implemented, with a particular focus on improvements to MIDAS web
> > functionality and analyzers.  But equally important would be to hear the
> > experiences of MIDAS users. What aspects of MIDAS work well?  Which aspects need
> > improving?  What are the major trends in scientific computing that we should
> > adapt to?  We always appreciate feedback and suggestions from the MIDAS
> > community (even when we have trouble finding time to make the changes!)
> > 
> > We will naturally broadcast the workshop on the web, but it would also be great
> > if anyone was interested in coming to TRIUMF in person to participate.
> > 
> > Thomas, on behalf of MIDAS developers

Hi Folks,

I just realized I never provided the location for the meeting (for those at TRIUMF).  It will be in the ISAC-II conference room.

Cheers,
Thomas

> Dear MIDAS colleagues,
> 
> We will use Zoom for people making remote connections to the MIDAS workshop next week.  The connection details 
> are shown below.  You will need to install a Zoom application, which should happen automatically when clicking on the 
> first link below.  It seemed to work pretty easily for me.
> 
> Cheers,
> Thomas
>  
> _________________________________________
> 
> Hi there,
> 
> Thomas Lindner is inviting you to a scheduled Zoom meeting.
> 
> Topic: MIDAS workshop
> Time: Jul 26, 2017 12:30 PM Pacific Time (US and Canada)
> 
> Join from PC, Mac, Linux, iOS or Android: https://zoom.us/j/749477537?pwd=-TSKYSiS0_k
>     Password: midas
> 
> Or iPhone one-tap (US Toll):  +16465588656,,749477537# or +14086380968,,749477537#
> 
> Or Telephone:
>     Dial: +1 646 558 8656 (US Toll) or +1 408 638 0968 (US Toll)
>     Meeting ID: 749 477 537
>     International numbers available: https://zoom.us/zoomconference?m=0Bug-COhDHYndpVqRLnNST9H-uXrauWk
> 
> 
> 
> 
> > Dear MIDAS users,
> > 
> > We have an approximately final agenda for the MIDAS workshop in two weeks.  The
> > workshop will be on July 26, from 1-6PM (Vancouver time).  The detailed agenda is
> > posted here:
> > 
> > https://indico.triumf.ca/conferenceDisplay.py?confId=2342
> > 
> > Next week I will provide details on how to remotely connect to the workshop.
> > 
> > Cheers,
> > Thomas
> > 
> > PS: as a reminder, the timetable and slides from the last MIDAS workshop can be
> > found here:
> > 
> > https://indico.psi.ch/conferenceTimeTable.py?confId=3793#20150715
> > 
> > 
> > 
> > > Dear MIDAS users,
> > > 
> > > We would like to announce another MIDAS workshop at TRIUMF on July 26, 2017. 
> > > This will be a follow-on to the successful workshop two years ago.  This
> > > workshop will again be during one of Stefan Ritt's visit to TRIUMF.
> > > 
> > > The goal of the workshop would be to have a general discussion on the state of
> > > MIDAS.  We would have presentations from MIDAS developers on new MIDAS features
> > > that are being implemented, with a particular focus on improvements to MIDAS web
> > > functionality and analyzers.  But equally important would be to hear the
> > > experiences of MIDAS users. What aspects of MIDAS work well?  Which aspects need
> > > improving?  What are the major trends in scientific computing that we should
> > > adapt to?  We always appreciate feedback and suggestions from the MIDAS
> > > community (even when we have trouble finding time to make the changes!)
> > > 
> > > We will naturally broadcast the workshop on the web, but it would also be great
> > > if anyone was interested in coming to TRIUMF in person to participate.
> > > 
> > > Thomas, on behalf of MIDAS developers

> Hi. Is it currently possible to automatically save the MIDAS ODB as a JSON file?
> I can do it manually in odbedit, but it looks like the only option for the
> automatic ODB save for each run is the standard .ODB format. Is there a way to
> change this?

I have the reverse question: Once we have a json file, can it be loaded again in the odb? We also use the odb as our analysis config. I don`t like .odb files in our repo, so we currently load settings in shell scripts (e.g. run dependent detector calibrations)

Is there a simple way from the javascript side to check if a fontend is running?
Currently one would need to go through the /System/Client list to find out if a
frontend/client is running. Wouldn't it be nice to have this centralized, either
in the mhttpd.cxx or mhttpd.js part? 

> Is there a simple way from the javascript side to check if a fontend is running?
> Currently one would need to go through the /System/Client list to find out if a
> frontend/client is running. Wouldn't it be nice to have this centralized, either
> in the mhttpd.cxx or mhttpd.js part? 

Hi,

I think that this option already exists with the cm_exist method for the mjsonrpc calls.  For instance, you can use a 
call like 

curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","id":null,"method":"cm_exist","params":
{"name":"Logger"}}' 'http://localhost:8081?mjsonrpc'

to get the status of the logger program.  There is a description of the cm_exist parameters on this page:

https://midas.triumf.ca/MidasWiki/index.php/Mjsonrpc

> > Is there a simple way from the javascript side to check if a fontend is running?
> > Currently one would need to go through the /System/Client list to find out if a
> > frontend/client is running. Wouldn't it be nice to have this centralized, either
> > in the mhttpd.cxx or mhttpd.js part? 
> 
> Hi,
> 
> I think that this option already exists with the cm_exist method for the mjsonrpc calls.  For instance, you can use a 
> call like 
> 
> curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","id":null,"method":"cm_exist","params":
> {"name":"Logger"}}' 'http://localhost:8081?mjsonrpc'
> 
> to get the status of the logger program.  There is a description of the cm_exist parameters on this page:
> 
> https://midas.triumf.ca/MidasWiki/index.php/Mjsonrpc

Thanks a lot for the info. I just simply missed it :-|

I started to use the new midas custom page features from 
https://midas.triumf.ca/MidasWiki/index.php/Custom_Page . I'd like to setup the 
editable odb values (.e.g <div name="modbvalue" data-odb-path="/Runinfo/Run 
number" data-odb-editable="1"                    
style="position:absolute;top:157px;left:288px;"></div>) from within javascript, 
which doesn`t seem to work. 

 Both 

document.getElementById("test").innerHTML = '<div data-odb-editable="1" data-
odb-path="/Runinfo/Run number" name="modbvalue" 
style="display:inline;position:absolute;top:157px;left:288px;"></div>'

or 

var elem = document.createElement("div");
	 //var id = "manifold0";
	    elem.setAttribute("name","modbvalue");
	 elem.setAttribute("data-odb-
path","/Equipment/Autofill/Variables/Output[6]");
	 elem.setAttribute("data-odb-editable","1");
	 elem.style="position:absolute;top:157px;left:288px;";
         document.getElementById("test").appendChild(elem);

fail on name="modbvalue" with the error 

mjsonrpc_error_alert: TypeError: Cannot set property 'innerHTML' of undefined


How should one do this? I don`t want hard code everything in the htlm body, as 
I have look up odb key indexes in the javascript code.

The function mhttpd_init() scans the custom page and installs handlers etc. for each modbxxx 
element. If you create an modbvalue dynamically in your code, this is probably done after you 
called mhttpd_init(), so the function has no chance to modify the dynamically created element.

To fix that, I separated mhttpd_init() into the old init function which installs the header and sidebar, 
and a function mhttpd_scan() which scans the custom page and processes all modbxxx elements. 
Next, I tapped the error you reported, and added an automatic call to mhttp_scan() in case that 
happens. I tried it on a test page and it worked for me. Please give it a try (commit 090394e8).

Stefan

> The function mhttpd_init() scans the custom page and installs handlers etc. for each modbxxx 
> element. If you create an modbvalue dynamically in your code, this is probably done after you 
> called mhttpd_init(), so the function has no chance to modify the dynamically created element.
> 
> To fix that, I separated mhttpd_init() into the old init function which installs the header and sidebar, 
> and a function mhttpd_scan() which scans the custom page and processes all modbxxx elements. 
> Next, I tapped the error you reported, and added an automatic call to mhttp_scan() in case that 
> happens. I tried it on a test page and it worked for me. Please give it a try (commit 090394e8).
> 
> Stefan

Also works for me

 thanks

> > The function mhttpd_init() scans the custom page and installs handlers etc. for each modbxxx 
> > element. If you create an modbvalue dynamically in your code, this is probably done after you 
> > called mhttpd_init(), so the function has no chance to modify the dynamically created element.
> > 
> > To fix that, I separated mhttpd_init() into the old init function which installs the header and sidebar, 
> > and a function mhttpd_scan() which scans the custom page and processes all modbxxx elements. 
> > Next, I tapped the error you reported, and added an automatic call to mhttp_scan() in case that 
> > happens. I tried it on a test page and it worked for me. Please give it a try (commit 090394e8).
> > 
> > Stefan
> 
> Also works for me
> 
>  thanks


This is more about aesthetic, but when I use the modbvalue div, it first only shows the odb value. However, 
after editing, the odb index gets added to the field, which is kinda ugly -> see attachments

Dear expert,
      I'm developing a frontend and I'm getting this kind of error at each event:

10:14:56.564 2018/05/04 [Sample Frontend,ERROR] [odb.c:5911:db_set_data1,ERROR]
online database full

If I run the mem command in odbedit I get the result at the end of this post.

Notice that I need to use an event size which is significantly larger than the
default one. I don't know if it is relevant for this error. I have in the ODB:

  /Experiment/MAX_EVENT_SIZE = 900000000

and in the frontend code:

  /* maximum event size produced by this frontend */
  INT max_event_size = 300000000;

  /* maximum event size for fragmented events (EQ_FRAGMENTED) */
  INT max_event_size_frag = 5 * 1024 * 1024;

  /* buffer size to hold events */
  INT event_buffer_size = 600000000;

Events seem to be properly stored in the output files, but I'm afraid I could
get some other problem.

Thank you for your help,
         Francesco

-------------------------------------------------------------------------

Database header size is 0x21040, all following values are offset by this!
Key area  0x00000000 - 0x0007FFFF, size 524288 bytes
Data area 0x00080000 - 0x00100000, size 524288 bytes

Keylist:
--------
Free block at 0x00000B58, size 0x00000008, next 0x000053E0
Free block at 0x000053E0, size 0x00000008, next 0x00006560
Free block at 0x00006560, size 0x00079AA0, next 0x00000000

Free Key area: 498352 bytes out of 524288 bytes

Data:
-----
Free block at 0x000847F0, size 0x0007B810, next 0x00000000

Free Data area: 505872 bytes out of 524288 bytes

Free: 498352 (95.1%) keylist, 505872 (96.5%) data

Two options:

1) Do NOT send your events into the ODB. This is controlled via the flag RO_ODB in your frontend setting. For simple experiments with small events, it might make sense to copy each 
event into the ODB for debugging, but if you have large events, this does not make sense. Use the "mdump" utility to check your events instead.

2) Increase the size of the ODB. See the first FAQ here: https://midas.triumf.ca/MidasWiki/index.php/FAQ

Stefan


> Dear expert,
>       I'm developing a frontend and I'm getting this kind of error at each event:
> 
> 10:14:56.564 2018/05/04 [Sample Frontend,ERROR] [odb.c:5911:db_set_data1,ERROR]
> online database full
> 
> If I run the mem command in odbedit I get the result at the end of this post.
> 
> Notice that I need to use an event size which is significantly larger than the
> default one. I don't know if it is relevant for this error. I have in the ODB:
> 
>   /Experiment/MAX_EVENT_SIZE = 900000000
> 
> and in the frontend code:
> 
>   /* maximum event size produced by this frontend */
>   INT max_event_size = 300000000;
> 
>   /* maximum event size for fragmented events (EQ_FRAGMENTED) */
>   INT max_event_size_frag = 5 * 1024 * 1024;
> 
>   /* buffer size to hold events */
>   INT event_buffer_size = 600000000;
> 
> Events seem to be properly stored in the output files, but I'm afraid I could
> get some other problem.
> 
> Thank you for your help,
>          Francesco
> 
> -------------------------------------------------------------------------
> 
> Database header size is 0x21040, all following values are offset by this!
> Key area  0x00000000 - 0x0007FFFF, size 524288 bytes
> Data area 0x00080000 - 0x00100000, size 524288 bytes
> 
> Keylist:
> --------
> Free block at 0x00000B58, size 0x00000008, next 0x000053E0
> Free block at 0x000053E0, size 0x00000008, next 0x00006560
> Free block at 0x00006560, size 0x00079AA0, next 0x00000000
> 
> Free Key area: 498352 bytes out of 524288 bytes
> 
> Data:
> -----
> Free block at 0x000847F0, size 0x0007B810, next 0x00000000
> 
> Free Data area: 505872 bytes out of 524288 bytes
> 
> Free: 498352 (95.1%) keylist, 505872 (96.5%) data

I am embedding histories into a custom page within an SVG,

<image x="21000" y="1000" width="6000" height="6000"
href="../HS/SampleCryo/SampleTemp.gif?width=230&scale=0.5h"/>

this works fine. However, I would like to update this regularly without
refreshing the full page via

<meta http-equiv="Refresh" content="60">

is there a good way to do that? By the way, the "Periodic update of parts of a
custom page" from the documentation does not seem to work here.

I am setting up a sqlite db to serve as a run database.

The easiest option is to use the history sqlite feature, and add run information 
as virtual history events

however:

Invalid tag 0 'Comment' in event 21 'Run Parameters': cannot do history for 
TID_STRING data, sorry!

I'd like to save e.g. the edit on start information , with shift crew checks. 
Would it be easy to allow for text, or is this inherent to the history system 
handling binary data?