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Step-by-step guide

GUI Profiling

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Enable profiling in Checkmk

1. Setup → General → Global Settings → User Interface → Profile Request
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2. Modify the URL to profile by adding '&_profile=1' and fire submit the request in your browser.

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

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3. Now two files are created in ~{{$OMD_ROOT/var/check_mk/}}.

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

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

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   root@mylinuxhost:/opt/omd/sites/mysite/var/check_mk# ./multisite.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/mysite/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} ... ...

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

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   linuxuser@mylinuxhost:/omd/sites/mysite/var/check_mk$ sudo cp multisite.profile /tmp/ linuxuser@mylinuxhost:/tmp$ sudo chown linuxuser:linuxuser multisite.profile

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6. Install the Python module (for Python 2 or Python 3, respectively).

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   root@mylinuxhost:~# pip install snakeviz root@mylinuxhost:~# pip3 install snakeviz

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7. Now you can use snakeviz to view the profiling file.

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   linuxuser@mylinuxhost:/tmp$ snakeviz multisite.profile

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

Profiling via cli

1. The cmk commands have the option to profile them.

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

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2. The profile file will be created in the current directory. Let's go to tmp and run the cmk command with the profile option.

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   ➜ ~ su - at OMD[mysite]:~$ cd tmp OMD[mysite]:~$ cmk -Afv --profile

   
   

   Note
   cmk -Afv --profile is only one example. This command will trigger the agent baking via the CLI. You may need to profile a different command.

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   • 1. Now we will see two files:

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        OMD[mysite]:~/tmp$ ls |grep profile profile.out* show_profile.py*

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     2. To work with these files, we need to copy them outside the site.

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        OMD[mysite]:~/tmp$ cp show_profile.py profile.out /tmp/

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     3. Now there are two ways to analyze these files:
        
        

        1. Open the profile file via the command line:

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           ➜ /tmp ./show_profile.py

           
           

        2. Analyze via snakevize as described here: Checkmk

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1. • 1. 1. profiling#GUIProfiling
           
           

Profile a Checkmk function

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from cmk.utils.profile import profile_call
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@profile_call("/tmp/myprofile_dir")
def my_func_to_profile(self):
    print("ding dong")

Analyze a profiling file with python3 but generated on python2

There is a simple to achieve this anyway:

The solution is: Python virtualenv inspired by: https://computingforgeeks.com/how-to-install-python2-with-virtualenv-on-ubuntu/How To Install Python 2 with Virtualenv on Ubuntu 20.04

Here is my short step-by-step guide:

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In this env, you can analyze all profile files generated with python2!

Network Analyze with the Internet browser

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1. Start the Network Monitor
   • Ctrl + Shift + I

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1. • 
     
   • For Firefox, follow this manual:

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1. • Firefox Network Analyzer
   • For Google Chrome, follow this manual:

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1. • Chrome Network Analyzer
     
     
2. Reload the slow/ crashing view again and save/export this file as .har. Please submit this file to us.

Slow views

Some built-in or own views may take longer time than expected. In order to detect slow views, you have to set:

• The log level to DEBUG at Setup > General > Global settings > User interface > Log levels > Slow views

• A threshold (in seconds) at Setup > General > Global settings > User interface > Threshold for slow views
  
  

The logging is disabled by default. The default threshold is set to 60 seconds.

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If enabled, one log entry per view rendering that exceeds the configured threshold is logged to var/log/web.log.

A slow-view log entry will look like the following:

2023-10-05 14:01:02,467 [10] [cmk.web.slow-views 783147] View name: logfile, User: cmkadmin, Row limit: None, Limit type: none, URL variables: ['csrf_token=deaacdae-e2ad-47bb-a497-8a41c4f5e378', 
'filled_in=filter', 'is_log_notification_phase=-1', 'limit=none', 'logclass0=on', 'logclass1=on', 'logclass2=on', 'logclass3=on', 'logclass5=on', 'logclass8=on', 'logst_h0=on', 'logst_h1=on', 
'logst_h2=on', 'logst_s0=on', 'logst_s1=on', 'logst_s2=on', 'logst_s3=on', 'logtime_from=400', 'logtime_from_range=86400', 'logtime_until_range=3600', 'view_name=logfile', '_show_filter_form=1'], 
View context: {'optservicegroup': {'optservice_group': '', 'neg_optservice_group': ''}, 'siteopt': {'site': ''}, 'log_class': {'logclass0': 'on', 'logclass1': 'on', 'logclass2': 'on', 'logclass3': 
'on', 'logclass4': '', 'logclass5': 'on', 'logclass6': '', 'logclass8': 'on'}, 'log_notification_phase': {'is_log_notification_phase': '-1'}, 'hostregex': {'host_regex': ''}, 'serviceregex': 
{'service_regex': ''}, 'opthostgroup': {'opthost_group': '', 'neg_opthost_group': ''}, 'logtime': {'logtime_from': '400', 'logtime_until': '', 'logtime_from_range': '86400', 'logtime_until_range': '3600'},
'log_state': {'logst_h0': 'on', 'logst_h1': 'on', 'logst_h2': 'on', 'logst_s0': 'on', 'logst_s1': 'on', 'logst_s2': 'on', 'logst_s3': 'on'}, 'wato_folder': {'wato_folder': ''}}, Unfiltered rows: 
24783, Filtered rows: 24783, Rows after limit: 0, Duration fetching rows: 0.69s, Duration filtering rows: 0.00s, Duration rendering view: 18.44s, Rendering page exceeds 3s: 19.21s

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