GUI Debbuging

It is possible to profile the rendering process of Multisite pages. This is done using the Python module cProfile. For viewing the profiling data, we use snakeviz.

SnakeViz is a viewer for Python profiling data that runs as a web application in your browser. It is inspired by the wxPython profile viewer RunSnakeRun.

Step-by-step guide

1. Enable profiling in Checkmk

   WATO - CONFIGURATION → Global Settings → USER INTERFACE

   

   Don't use 'Enable profiling by request'. This option will profile a Multisite request randomly and you and at the most of the time it will be the slowest one.

2. Install Python module

   root@cmk-VirtualBox:~# pip install snakeviz

3. Modify the URL to profile by adding '&_profile=1'

   http://localhost/nagnis_master/check_mk/view.py?view_name=allhosts&_profile=1

4. Now two files are created in ~/var/check_mk/

   root@klappanas:/opt/omd/sites/nagnis_master/var/check_mk# ll |grep multisite
   -rw-rw---- 1 nagnis_master nagnis_master 100246 Nov 6 13:35 multisite.profile
   -rwxr-xr-x 1 nagnis_master nagnis_master 155 Nov 6 13:35 multisite.profile.py*

   • By executing 'multisite.profile.py'  you can get runtime statistics about the last processed page

     root@klappanas:/opt/omd/sites/nagnis_master/var/check_mk# ./multisite.profile.py |more
     Fri Nov  6 13:35:33 2020    /omd/sites/nagnis_master/var/check_mk/multisite.profile
     
              9585 function calls (9480 primitive calls) in 0.007 seconds
     
        Ordered by: internal time
     
        ncalls  tottime  percall  cumtime  percall filename:lineno(function)
             1    0.001    0.001    0.002    0.002 /omd/sites/nagnis_master/lib/python/cmk/gui/modules.py:140(_cmk_gui_top_level_modules)
          4652    0.000    0.000    0.000    0.000 {method 'startswith' of 'str' objects}
     ...
     ...
     ...
     ...

   • For viewing multisite.profile with snakeviz, move the file to another directory (e.g. /tmp) and change the owner to the owner of your Internet Browser

     anastasios@klappanas:/omd/sites/nagnis_master/var/check_mk$ sudo cp multisite.profile /tmp/
     anastasios@klappanas:/tmp$ sudo chown anastasios:anastasios multisite.profile
     

   • Now you can use snakeviz for viewing the profiling file

     anastasios@klappanas:/tmp$ snakeviz multisite.profile

     

5. Now you can analyze at which point of the request your view needs the most time!

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