Checkmk profiling

bIt 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

GUI Profiling

Enable profiling in Checkmk

SETUP→ General → Global Settings → USER INTERFACE
Don't use 'Enable profiling for all request'. This option will profile a Multisite request randomly and you and at the most of the time it will be the slowest one.

Install Python module

root@cmk-VirtualBox:~# pip install snakeviz
root@cmk-VirtualBox:~# pip3 install snakeviz

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

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

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

Profiling via cli

tbf

OMD[at]:~$ cmk |grep profile
   --profile           Enable profiling mode

Network Analyze with the internet browser
1. Start the Network Monitor
  
  Ctrl + Shift + I
  or
  For Firefox follow this manual: https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor
  For Google Chrome follow this manual: https://developer.chrome.com/docs/devtools/network/
2. Now reload the slow/ crashing view again and save/export this file as .har. Please submit this file to us

Checkmk profiling

Step-by-step guide

GUI Profiling

Network Analyze with the internet browser