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Step-by-step guide

GUI Profiling

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Warning
Don't use 'Enable profiling for all requests'. This option will profile a Multisite request randomly, and most of the time, it will be the slowest one.

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.

Enable profiling in Checkmk

1. Setup → General → Global Settings → USER INTERFACE

   Image Removed

   Don't use 'Enable profiling for all request'. This option will profile a Multisite request randomly, and most of the time, it will be the slowest one User Interface → Profile Request
   Image Added
   .
   

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

   fire

   submit the request in your browser.

   Code Block
   language bash theme RDark
   http://localhost/nagnis_master/check_mk/view.py?view_name=allhosts&_profile=1

   .

3. Now two files are created in

   ~

   {{$OMD_ROOT/var/check_mk/}}.

   Code Block

   root@klappanas

   theme RDark

   root@mylinuxhost:/opt/omd/sites/

   nagnis_master

   mysite/var/check_mk# ll |grep multisite -rw-rw---- 1

   nagnis_master nagnis_master

   mysite mysite 100246 Nov 6 13:35 multisite.profile -rwxr-xr-x 1

   nagnis_master nagnis_master

   mysite mysite 155 Nov 6 13:35 multisite.py*

   .

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

   Code Block

   root@klappanas

   language bash theme RDark

   root@mylinuxhost:/opt/omd/sites/

   nagnis_master

   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/

   nagnis_master

   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} ... ...

   ... ..

   .

5. 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.

   Code Block
   language bash theme RDark

   anastasios@klappanas

   linuxuser@mylinuxhost:/omd/sites/

   nagnis_master

   mysite/var/check_mk$ sudo cp multisite.profile /tmp/

   anastasios@klappanas

   linuxuser@mylinuxhost:/tmp$ sudo chown

   anastasios

   linuxuser:

   anastasios

   linuxuser multisite.profile

   .

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

   Code Block
   language bash

   root@cmk-VirtualBox

   theme RDark

   root@mylinuxhost:~# pip install snakeviz

   root@cmk-VirtualBox

   root@mylinuxhost:~# pip3 install snakeviz

   .

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

   Info Code Blockanastasios@klappanas

   Code Block
   language bash theme RDark
   linuxuser@mylinuxhost:/tmp$ snakeviz multisite.profile

   Image Removed

   
   Image Added

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

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Profiling via cli

1. The cmk commands have

   an

   the option to profile them.

   Code Block
   language bash theme RDark
   OMD[

   at

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

   .

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.

   Code Block
   language bash theme RDark
   ➜ ~ su - at OMD[

   at

   mysite]:~$ cd tmp OMD[

   at

   mysite]:~$ cmk -Afv --profile

   
   

   Note
   cmk -Afv --profile is only one example. This command will trigger the agent baking via the

   cli

   CLI. You may need to profile a different command.

   .

   • 1. Now we will see two files:

        Code Block
        language bash theme RDark
        OMD[

   at

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

        .

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

        Code Block
        language bash theme RDark
        OMD[

   at

   • 1. mysite]:~/tmp$ cp show_profile.py profile.out /tmp/

        .

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

        1. Open the profile file via the command line:

           Code Block
           language bash theme RDark
           ➜ /tmp ./show_profile.py

           
           

        2. Analyze via snakevize as described here: Checkmk
   profiling
   • 1. 1. profiling#GUIProfiling
           
           

Profile a

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Checkmk function

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There is an option to profile a function inside

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Checkmk. This can be either your own code, e.g., a plugin or a checkmk-specific code:

from cmk.utils.profile import profile_call
.....

@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:

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The solution is: Python virtualenv inspired by: 

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How To Install Python 2 with Virtualenv on Ubuntu 20.04

Here is my short step-by-step guide:

# Install virtualenv
sudo apt install virtualenv

# Create a directory for virtualenv
mkdir ~/.virtualenvs

# Change to this directory and create a virtualenv with the python interpreter you want (we will use python2)
cd ~/.virtualenvs
virtualenv --python=python2 env

# Confirm that the right python version is installed
ls env/lib
 
# Activate the new virtualenvironment
source env/bin/activate

# Now you can install all kind of modules inside this python2 context
pip install snakeviz

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

Network Analyze with the

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Internet browser

1. Start the Network Monitorinfo
   • Ctrl + Shift + I
   or
   • 
     
   • For Firefox, follow this manual:
   https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor
   • Firefox Network Analyzer
   • For Google Chrome, follow this manual:
   https://developer.chrome.com/docs/devtools/network/Now reload
   • 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.

Image Added

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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