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
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.
Install Python module
root@cmk-VirtualBox:~# pip 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!