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The midas documentation has moved. See [https://midas.triumf.ca/docs/develop/getting_started/installation/ Installation and environment] and [https://midas.triumf.ca/docs/develop/getting_started/first_experiment/ Set up your first experiment] for the new documentation about installing midas and setting up an experiment.
== Introduction ==
This quickstart shows you how to install the MIDAS packages on a linux box and create a MIDAS experiment.
The linux box will be called the '''MIDAS host'''.
 
==Installation==
Log on to the MIDAS host and decide on a name for the experiment (the '''MIDAS experiment name''').
In this installation, the MIDAS packages and experiment will be installed under the username "johnfoo".
The ODB and other shared memory buffers for the MIDAS experiment will reside on the MIDAS host (localhost).
 
In this quickstart, MIDAS and the other required packages will be installed under $HOME/packages . The '''MIDAS experiment directory''' will be $HOME/online and the '''MIDAS experiment name''' will be "e777". The MIDAS host name will be "mhostpc"
 
The user should substitute appropriate host name, username, MIDAS experiment name and directories appropriate to his/her own setup.
 
== Experimental setup ==
These instructions describe setting up an experiment that will run ONLY on the MIDAS host computer (i.e. '''localhost only'''). In this case, the MIDAS host has access to any hardware required, and all frontends, logger, analyzer etc. run on the one computer.
 
Modifications to run an experiment with additional frontend(s) running '''remotely''' (i.e. on remote cpu(s)) will also be described
below. Follow the instructions for setting up a localhost experiment until indicated.
In both cases, the main MIDAS applications (e.g. [[mlogger]], [[mhttpd]]) run on the MIDAS host.
 
==Environment Variables==
The following Environment variables should to be added to the $HOME/.cshrc (or .bash) file depending on your shell so that they will then be defined at login. '''Substitute appropriate values for your own setup'''.
<small>
{| class="wikitable"
|-
! csh  !! bash !! comment
|-
|  setenv LANG C ||  export LANG=C || ||
|-
| setenv GIT_EDITOR "emacs -nw" || export GIT_EDITOR="emacs -nw" || ||
|-
| setenv MIDASSYS $HOME/packages/midas ||  export MIDASSYS=$HOME/packages/midas ||Base directory of the MIDAS package
|-
| setenv ROOTSYS  $HOME/packages/root  || export ROOTSYS=$HOME/packages/root|| setup ROOTSYS only if using ROOT
|-
| setenv MIDAS_EXPTAB $HOME/online/exptab || export MIDAS_EXPTAB=$HOME/online/exptab  || MIDAS experiment table
|-
|-
| setenv MIDAS_EXPT_NAME e777  || export MIDAS_EXPT_NAME=e777  || MIDAS experiment name
|-
| setenv PATH .:$MIDASSYS/linux/bin:$PATH  || export PATH=$PATH:$MIDASSYS/linux/bin || path
|-
| setenv PATH .:$HOME/online/bin:$ROOTSYS/bin:$PATH|| export PATH=$PATH:$HOME/online/bin:$ROOTSYS/bin  ||if using ROOT
|}
</small>
Logout and login again, or source .cshrc (source .bashrc) for the changes to take effect.
 
== ROOT Package Installation ==
For full MIDAS operation, ROOT is needed for the data logging and analysis packages. It needed to build the example analyzer in this Quickstart.  However, ROOT is not essential to run MIDAS. If ROOT is NOT installed, the environment variable ROOTSYS should be undefined.
 
If ROOT is needed, see [[Setup MIDAS experiment#Install ROOT|Install ROOT]].
 
== MIDAS Package Installation ==
The MIDAS package will be installed in the directory given by MIDASSYS - see [[#Environment Variables]].
 
Install the MIDAS and other package(s) from the MIDAS git repository as follows:
<small>
    mkdir $HOME/packages
    cd $HOME/packages
    git clone https://bitbucket.org/tmidas/midas
    git clone https://bitbucket.org/tmidas/mxml
</small>
Install the MSCB  package only if you will be using the MSCB system for slow-controls (see [[MSCB Page]]):
<small>
    git clone https://bitbucket.org/tmidas/mscb    ## MSCB package
    cd mscb
    make        ## Build the MSCB package
    cd ../
</small>
The MIDAS Makefile will auto-detect whether MSCB, ROOT, MYSQL, SQLITE, ODBC etc. are available (or have been installed). If you need these features, make sure they are available before building the MIDAS package.
<small>
    cd midas
    make          ## Build the MIDAS package
    ls -l linux/bin/odbedit      ### check that odbedit has been created (do not run it yet)
</small> 
 
In case of problems see
* [[Installation#Installing MIDAS|bitbucket is down]] or
* [[Installation/Compilation problems#SSL certificate errors|SSL certificate errors]].
 
 
==ROOTANA Package Installation==
If ROOTANA is needed,
    <small>cd $HOME/packages
    git clone https://bitbucket.org/tmidas/rootana
    cd rootana
    make
</small>
==ROODY Package Installation==
If ROODY is needed,
    <small>cd $HOME/packages
    git clone https://bitbucket.org/tmidas/roody
    cd roody
    make</small>
   
 
== Create the Experiment file exptab ==
In this example, the experimental directory is $HOME/online.
<small>mkdir $HOME/online
cd $HOME/online</small>
Create the [[exptab]] file "$HOME/online/exptab" containing the three parameters
# the experiment name
# location of MIDAS shared memory buffers
# username
as follows (using parameters for your own experiment):
    <small>cat > exptab
    e777 /home/johnfoo/online johnfoo</small>
 
The path of the exptab file is given by MIDAS_EXPTAB - see [[#Environment Variables]].
 
== Create shared memory files  ==
At this point you should be able to run [[odbedit]] on localhost. The first time odbedit is run, it will create the required .*.SHM files  in the MIDAS experiment directory $HOME/online.
 
The default directory $HOME/online will contain the MIDAS messages file (midas.log) and
any data files you may create. If you want an alternative location for the data files see [[#Customizing your experiment]].
 
Now run odbedit, and type the command "ls" to list the default directories.
<small>odbedit
[local:e777:S]/>ls
Experiment
System
Programs
Logger
Runinfo
Alarms</small>
 
== Run the MIDAS logger ==
Start the MIDAS logger [[mlogger]]
<small>mlogger</small>
This should start without error at this point. It is usually run as a daemon, however in this case it is run in a terminal to check for errors. Starting the midas logger [[mlogger]] will automatically create more keys in the  {{Odbpath|path=/Logger}} ODB tree.
 
 
== Run the MIDAS Web Server ==
If you are running behind a firewall or plan to set up an HTTPS/SSL proxy, follow the instructions
[[Setup MIDAS experiment#mhttpd using an HTTPS/SSL proxy|mhttpd using an HTTPS/SSL proxy]].
 
Otherwise, the MIDAS Web Server [[mhttpd]] with HTTPS/SSL (Mongoose) will be used. This is the default.
Now start [[mhttpd]] like this:
<small> mhttpd</small>
You will get the following messages:
<small>[mhttpd,INFO] ODB subtree /Runinfo corrected successfully
Mongoose web server will listen on ports "8080r,8443s"
Mongoose web server will use SSL certificate file "/home/johnfoo/packages/midas/ssl_cert.pem"
[mhttpd,ERROR] [mhttpd.cxx:17633:mongoose,ERROR] mongoose web server cannot find password file "/home/johnfoo/online/htpasswd.txt"
[mhttpd,ERROR] [mhttpd.cxx:17634:mongoose,ERROR] please create password file: htdigest -c /home/johnfoo/online/htpasswd.txt Default midas
could not start the mongoose web server, see messages and midas.log, bye!</small>
 
For testing, use the SSL certificate file provided in the MIDAS package (unless your site provides one, or you wish to [[Mhttpd#Create an SSL certificate|create your own SSL certificate]].
 
However, you do need to create a password file by following the above instructions. You will be asked to type in a password
 
<small>
$htdigest -c /home/johnfoo/online/htpasswd.txt Default midas
Adding password for midas in realm Default.
New password:
Re-type new password:
</small>
Now restart mhttpd
<small> mhttpd
Mongoose web server will listen on ports "8080r,8443s" **see note
Mongoose web server will use SSL certificate file "/home/suz/packages/midas/ssl_cert.pem"
Mongoose web server will use authentication realm "Default", password file "./htpasswd.txt"
</small>
Now point a web browser running on the same host computer (localhost) to https://localhost:8443
If the web browser is running on a different computer, go to URL of the form
<small>
https://mhostpc.triumf.ca:8443  (substitute your host machine name and domain for "mhostpc.triumf.ca")
</small>
If you are using the default SSL certificate you will probably get a message: "This Connection is Untrusted".  Click "I understand the risks" and add an exception. This is because the test certificate is self-signed. Then confirm an exception.
 
You should then see an authentication box asking you for the user name and password. The user name is "midas". Enter the password you just created. The Midas [[Status Page]] should appear with multiple buttons for run control as well as equipment listing (no equipments will be listed as yet) and application listings. Please refer to [[mhttpd]] (the MIDAS Web-based Run Control utility) for further information. You can start and stop runs from the main status page, and use the [[ODB Page]] to access the database (ODB).
 
;** Note
: Default ports of 8080 and 8443 are used by [[mhttpd]]. If these ports are in use on your machine, start mhttpd with alternative ports, e.g.
      <small>mhttpd --https 8448 --http 8089</small>
: or see [[Mhttpd#Usage]] to change the default ports.
 
 
== Clients run on Localhost only ==
;NOTE:
* If creating a MIDAS experiment with a '''REMOTE''' frontend, '''continue by following the instructions''' [[#Running with one or more REMOTE frontend(s)]].
 
* If all clients are running on '''localhost''', continue with the following instructions:
 
=== Frontend and analyzer (localhost) ===
There are several examples of [[Frontend user code]] (frontend.c) in the MIDAS package available under $MIDASSYS/examples/. Choose a suitable example from this directory that you can later modify for your own particular setup (e.g. for a slow control, choose the slowcont/ example).
 
A frontend is a program that usually reads data from the hardware and sends the data to be logged and analyzed. You can find documentation about the frontend structure under [[Frontend Application]], [[Frontend Operation]] and [[Frontend user code]].
 
The example chosen here is from $MIDASSYS/examples/experiment/. It does '''not need any hardware''' and produces simulated events. 
 
On the MIDAS host (localhost), copy the example to the experiment directory and build it.
      cd $HOME/online
      cp $MIDASSYS/examples/experiment/* .
      make
The analyzer will only build if ROOT has previously been installed.
At this point the frontend and the analyzer should be ready if no errors were generated during the build. Try the frontend and analyzer by starting them in xterms.
$frontend
Starting the frontend will automatically create the  {{Odbpath|path=/Equipment}} ODB tree and one or more equipments. In this case, the equipments "trigger" and "scaler" have been defined by code in frontend.c and created the first time frontend runs.
 
$odbedit
[local:e777:S]/>ls /equipment
Trigger                       
Scaler 
View the MIDAS main status web page (by pointing your browser to https://localhost:8443/ or appropriate port if not using the default).
Observe on the [[Status Page]] that the two Equipments (Trigger, Scaler) have appeared in the Equipment section (Figure 1)
'''Click thumbnail to enlarge'''
[[File:sample_frontend_status.png|thumb|left|Figure 1: Equipments shown on Status Page]]
<div style="clear: both"></div>  <!-- clear wraparound after thumbnail -->
 
Rather than using odbedit,  you can view the contents of these equipments by clicking on the ODB button, then on /Equipment, then Trigger or Scaler. See [[ODB Page]] for more information.
 
Start a run by pressing the Start button on the [[Status Page]].
 
The frontend will show an event display that will update when a run is started, e.g.
 
Sample Frontend connected to <local>. Press "!" to exit      18:48:2546:08
==========================================================================
Run status:  Running    Run number 2                                  |/  /
===========================================================================
Equipment    Status    Events    Events/sec Rate[B/s]  ODB->FE FE->OD
---------------------------------------------------------------------------
Trigger      OK        13948      99.0      5413.0    0          140       
  aler        OK        15        0.3        15.4      0          15   
 
The [[Status Page]] will also show events being generated (click the refresh button if necessary).
 
While a run is in progress, the midas application mdump will provide you an event dump of the collected data from the running frontend, e.g.
$ mdump -l 50
- MIDAS revision: Mon Nov 2 11:50:51 2015 -0800 - 3b66779 -- Enter <!> to Exit ------- Midas Dump ---
------------------------ Event# 1 ------------------------
Evid:0001- Mask:0000- Serial:0- Time:0x567a0c5d- Dsize:40/0x28
#banks:2 - Bank list:-ADC0TDC0-
 
Bank:ADC0 Length: 8(I*1)/2(I*4)/4(Type) Type:Unsigned Integer*2
  1-> 0x0167 0x03c6 0x0069 0x0073
 
Bank:TDC0 Length: 8(I*1)/2(I*4)/4(Type) Type:Unsigned Integer*2
  1-> 0x0051 0x00ff 0x004a 0x00ec
 
For further data processing/analysis, either the midas analyzer or the rootana can used for data display as well.
 
=== Create a start_daq script (localhost) ===
It is useful to create a script that will automatically start all the required clients for the experiment. This is called a start_daq script. Create $HOME/online/bin/start_daq.sh as follows, (supply the mhttpd ports if default is not used).
 
<small>#!/bin/sh
# start_daq.sh
cd $HOME/online
odbedit -c clean
#  start mhttpd on default port. (Mongoose https version)
mhttpd  -D  # optionally restrict access to localhost and/or other specified hosts - see [[mhttpd]]
xterm -e ./frontend &
xterm -e ./analyzer &
mlogger -D
#end file</small>
 
Before running this script, you will need to shutdown any running clients:
$odbedit -c "sh all"
or you can use the mhttpd [[Program Page]] to shut them down.
 
The script will start them as daemons.
By running the script start_daq.sh, several midas applications will be started in sequence:
# Cleanup previous midas application (if any).
# Start the midas web server [mhttpd]
# Start the frontend application in its own xterm (for debugging purpose).
# Start the analyzer application in its own xterm (for debugging purpose).
# Start the Midas Data logger [mlogger]
 
  $ sh ./start_daq
 
 
   
== Running with one or more REMOTE frontend(s) ==
These instructions assume you have already followed the instructions to setup an experiment running on localhost, i.e. you have setup the MIDAS Environment variables, downloaded MIDAS packages, setup the [[mhttpd]] password etc.
 
In the case of remote frontend(s), the remote cpu(s) typically have access to some or all of the hardware. They might be VMIC cpus running in VME crates for example, connected to the MIDAS Host via Ethernet.  They read data from the hardware and send it back to the MIDAS Host to be logged and analyzed.
 
These instructions assume that there is one '''remote''' cpu, which is a 32-bit machine which mounts the /home disk of the localhost machine, so that it has access to the MIDAS packages, the $HOME/online directory and shares the .cshrc (or .bash) script. The REMOTE Host will be called "rlxhost" in these instructions. It is assumed that the MIDAS host is a 64-bit machine.
 
=== Build 32-bit MIDAS libraries ===
If the MIDAS host computer (localhost) is 64-bit, you will have already built the 64-bit MIDAS libraries. If the remote frontend is 32-bit, you will need to build the 32-bit MIDAS libraries on the 64-bit machine, i.e.
    [johnfoo@mhostpc e777] cd /home/packages/midas
    [johnfoo@mhostpc e777] make linux32                ### build the 32-bit MIDAS libraries on 64-bit machine
    [johnfoo@mhostpc e777] ls -l linux-m32/bin/odbedit ### check that the 32-bit odbedit has been created (do not run it)
 
=== Modify .cshrc (.bash) for remote host ===
Add the following to the .cshrc (modified appropriately for .bash).  When running with a REMOTE Host, the application [[mserver]] will be started (using a particular port) on the MIDAS host machine only.  Note that the environment variable MIDAS_SERVER_HOST is defined on the remote machine(s) but not on the MIDAS host.
# setenv MIDAS_HOST mhostpc  # substitute your midas host name
# setenv REMOTE_HOST rlxhost  # substitute your remote host name (add more if > 1)
# setup the MIDAS mserver host
#
switch (`hostname`)
case $MIDAS_HOST*:               
  unsetenv MIDAS_SERVER_HOST    ## MIDAS_SERVER_HOST not defined
  breaksw
default:
setenv MIDAS_SERVER_HOST $MIDAS_HOST.triumf.ca:1175  ## for remote host, define as hostname + domain name + default mserver port
                                                      ## port must match that of [[mserver]] used in start_daq.sh
endsw
#
# select 64-bit or 32-bit MIDAS and ROOT
#
switch (`uname -i`)
case i386:
  setenv ROOTSYS /triumfcs/trshare/olchansk/root/root_v5.28.00_SL55_32
  setenv PATH .:$MIDASSYS/linux-m32/bin:$PATH
  breaksw
default:
  setenv ROOTSYS $HOME/packages/root
  setenv PATH .:$MIDASSYS/linux/bin:$PATH
endsw
#
setenv PATH .:$HOME/online/bin:$HOME/packages/roody/bin:$ROOTSYS/bin:$PATH
#
 
After executing .cshrc (or .bash) or logging out, on the MIDAS host (mhostpc) make sure MIDAS_SERVER_HOST is NOT defined
[johnfoo@mhostpc e777] echo $MIDAS_SERVER_HOST
[johnfoo@mhostpc e777] MIDAS_SERVER_HOST: Undefined variable.
 
and on the REMOTE Host, make sure MIDAS_SERVER_HOST IS defined:
  [johnfoo@rlxhost e777] echo $MIDAS_SERVER_HOST
  [johnfoo@rlxhost e777] MIDAS_SERVER_HOST
 
Also on the REMOTE Host, make sure that the correct (32-bit) odbedit will be used (do not run it yet!)
[johnfoo@rlxhost e777] which odbedit
/home/johnfoo/packages/midas/linux-m32/bin/odbedit
 
=== Grant REMOTE host access permission ===
Give permission for the remote host(s) to access the experiment. Follow the instructions [[Security#MIDAS programs on remote machines||Allow MIDAS programs on remote machines]].  If the MIDAS web server is running, use [[ODB Page]] to edit the ODB keys listed, otherwise use [[odbedit]] on the MIDAS host machine.
=== Start mserver on MIDAS Host ===
The application [[mserver]] is not required when running on localhost only, but it IS required for access from a REMOTE frontend.
Start [[mserver]] on MIDAS host (default port 1175) or use the "-p" option for a different port.
The port must match the port defined for MIDAS_SERVER_HOST in .cshrc (or .bash) [[#Modify .cshrc (.bash) for remote host|above]].)
  [johnfoo@mhostpc e777] mserver -D
 
The environment variables on the REMOTE host should be:
[johnfoo@rlxhost e777]$ printenv | grep MIDAS
MIDASSYS=/home/e777/packages/midas
MIDAS_EXPT_NAME=e777
MIDAS_SERVER_HOST=mhostpc.triumf.ca:1175
 
=== Check access to ODB from REMOTE host ===
Run odbedit on the remote host to check access to ODB.
[johnfoo@rlxhost e777] odbedit
[mhostpc.triumf.ca:1175:e777:Stopped]/>ls
If it does not work correctly, check that
* MIDAS_SERVER_HOST is defined on REMOTE host with same port as mserver
* mserver is running on MIDAS host with the correct port
* MIDAS_SERVER_HOST is NOT defined on MIDAS host
* remote access permission to REMOTE host has been granted
as described above.
 
=== Build the analyzer on the MIDAS Host ===
The analyzer will be built on the MIDAS host machine.
Select an example from $MIDASSYS/examples/ (see [[#Frontend and analyzer (localhost)]]) and copy it to $HOME/online on the MIDAS host machine. Since we are assuming a 64-bit MIDAS host and a 32-bit remote host, edit the example Makefile so only the analyzer will be built.
 
=== Build the frontend (32bit) for REMOTE host ===
The frontend runs on a 32-bit remote host in this example. It therefore must either
* be built 32-bit on the 64-bit MIDAS host with the "-m32" flag
* or built on the REMOTE host
and in either case the [[#Build 32-bit MIDAS libraries|32-bit MIDAS libraries]] used for linking.
 
To avoid confusion, create a different subdirectory for the frontend, e.g.
  [johnfoo@rlxhost e777] mkdir $HOME/online/fe_32
Copy the Makefile and frontend code from the same example to this directory.
Modify the Makefile as needed, and only build the frontend. 
 
Once built, start the frontend in an xterm on the REMOTE host. Check that it connects successfully to the experiment and the Equipments appear on the [[Status Page]] as described under [[Frontend and analyzer (localhost)]].
[johnfoo@rlxhost e777] $HOME/online/fe_32/frontend
 
=== Run the Analyzer ===
Start the analyzer in an xterm on the MIDAS host
[johnfoo@mhostpc e777] a$HOME/online/analyzer
 
Continue by starting a run and dumping the data as described under [[Frontend and analyzer (localhost)]].
 
=== Create experiment startup script ===
It is useful to create a script that will automatically start all the required clients for the experiment. This is called a start_daq script. Create $HOME/online/bin/start_daq.sh as follows, (supply the mhttpd ports if default is not used).
#!/bin/sh
# start_daq.sh
cd $HOME/online
#
switch (`hostname`)
  case $MIDAS_HOST*:
      echo "Good, we are on $MIDAS_HOST"
      breaksw
  case $REMOTE_HOST*:
      echo "start_daq script should be executed on $MIDAS_HOST"
endsw
#
odbedit -c clean
#  start mhttpd on default port (Mongoose https version)
mhttpd  -D  # optionally restrict access to localhost and/or other specified hosts - see [[mhttpd]]
#  start mserver on default port (use argument -p to use a different port)
mserver -D  # start mserver on default port (1175) or a different port using -p option - see [[mserver]]
            # the port must match that of MIDAS_SERVER_HOST in .cshrc (.bash) - see above
            # access must be specifically allowed - see [[#Grant REMOTE host access permission||above]]
xterm -e ./analyzer &
## start frontend on remote host
#ssh $REMOTE_HOST $HOME/online/bin/start_frontend -O >& $HOME/online/bin/start_frontend.log  &
mlogger -D
#end file
 
Note that command to start the frontend on the remote host is commented out. It can be uncommented once the start_frontend script is
written and tested.
 
Shut down any clients that are running already by running odbedit on the MIDAS HOST
  odbedit>
[local:e777:S]/>sh all
 
Execute the new startup script start_daq.sh and check that odbedit works on the REMOTE host
 
 
 
 
=== Create start_frontend script === 
The startup file start_daq.sh  invoked a file start_frontend to start the remote frontend. This line was commented out (see above). Now that the frontend is working, create start_frontend script (e.g. file $HOME/online/bin/start_frontend).
 
#!/bin/tcsh
# Script to start frontend running on $REMOTE_HOST
#
# This script runs on the REMOTE HOST
#
echo "starting frontend for experiment $MIDAS_EXPT_NAME "
xterm -geometry 150x50+800+0 -fg white -bg blue -title "Frontend" -e  "$HOME/online/fe_32/frontend" &
echo "Frontend task has been started"
exit
 
Check that this script works by running it on the REMOTE host.
Then uncomment line in start_daq.sh, and check that start_daq.sh can start all the clients from the MIDAS host.
 
 
== Customize MIDAS for your experiment ==
Copy an example frontend and Makefile (from $MIDASSYS/examples/) to this directory and modify for your hardware as needed. The example Frontend.c is an example of [[Frontend user code]]. Use the modified Makefile to compile and build a frontend client with the 32-bit MIDAS libraries. You can find documentation about the frontend structure under [[Frontend Application]], [[Frontend Operation]] and [[Frontend user code]].
Here are some of the more common operations users can do to customize their experiments according to their own preferences:
=== create kill_daq script ===
Optionally create a script similar to start_daq.sh to shutdown the experiment
=== data logger ===
Set up the data logger [[mlogger]] to log data to a storage device. Many options are available - see [[Data Logging]], [[mlogger]] and
[[/Logger ODB tree]] for instructions.
 
=== create edit-on-start parameters ===
See [[Edit-on-start Parameters]]
=== allow programs to be restarted from the [[Programs Page]] ===
See mhttpd [[Programs Page]] and [[/Programs ODB tree]]
=== set up the alarm system ===
See [[Alarm System]] and [[Alarm Page]]
=== install hot-links as needed ===
See [[Event Notification (Hot-Link)]]
=== suppress some of the menu buttons on the Status Page ===
See mhttpd [[Status Page#page_switch_buttons]]

Latest revision as of 22:01, 30 October 2026

The midas documentation has moved. See Installation and environment and Set up your first experiment for the new documentation about installing midas and setting up an experiment.

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