Check availability of floating license

We are using MATLAB/Simulink floating license for continous integration. We've got the problem that MATLAB/Simulink ends up with an license checkout failed error, if no floating license is available. Is there a way to check if a license is a available before starting MATLAB/Simulink?

Answer 1

[Antonios Pournaras]

Here is a python function that prints how many licences are available and returns in this case. If there are no licenses available it tries again. The function calls the system command "lmutil" which is a license administration utility installed along with MATLAB. It writes the output to a file 'mat_lic.info'. Parses this file until it finds a line where there is information about the licence. Always check this file because its format may change through different MATLAB versions and the script needs modification. It works for MATLAB R2014b:

import subprocess
def matlab_license():
  while True:
    # substitute port and server with correct values
    # lmutil may not be in path. Put the whole path instead.
    lic_server=['lmutil','lmstat','-a','-c','port@server']
    cmdout = subprocess.check_output(lic_server)
    F=open('mat_lic.info','w')
    F.write(cmdout)
    F.close()
    F=open('mat_lic.info','r')
    for line in F:
      if 'Users of MATLAB' in line:
        text = line
        break
    F.close()
    num=[]
    for word in text.split():
      if word.isdigit():
        num.append(word)
    lic_avail = max(num) - min(num)
    if lic_avail  < 2:
       print "Only %d licence(s) found. Trying again." % lic_avail 
    else:
       print "Found %d licenses availabe." % lic_avail
       return

[Patrick Schmale]

Thanks for your reply. Meanwhile I wrote a similar PowerShell script doing the same:

# Powershell-Script to detect if an MATLAB/Simulink license is available
# If no license is avaiable the scripts sleeps for 15min and repeats the check

$licenseFile = "<Full-Path of License-File>.dat"
$licenseInfo = lmutil.exe lmstat -a -c $licenseFile | Select-String -Pattern 'Total of 0 licenses in use'
while($licenseInfo.Matches.Count -ne 2){
  Write-Host "No MATLAB/Simulink license availabe. Repeat after 15min..." 
  Start-Sleep -s 900
  $licenseInfo = lmutil.exe lmstat -a -c $licenseFile | Select-String -Pattern 'Total of 0 licenses in use'
}

[Davide Allaio]

Hello, I know it has been 5 years already, but could someone explain to me how to modify the lic_server string correctly in order for the function to work? Thank you very much!!

Answer 2

[Megha Parthasarathy]

Hello,

Refer to this link that talks about monitoring licenses.

[Patrick Schmale]

Hi,

thanks for your help. Running

lmutil lmstat -a -c %licenseFile%

just prints out the license information on the console. But I need some kind of environment variable telling me if a license is avaiable. Do you know how I can achieve this?