{"id":27705,"date":"2020-10-07T18:41:41","date_gmt":"2020-10-07T16:41:41","guid":{"rendered":"https:\/\/pi3g.com\/?p=27705"},"modified":"2020-10-07T18:41:41","modified_gmt":"2020-10-07T16:41:41","slug":"stress-testing-a-raspberry-pi-4-with-picockpit-temperature-monitoring","status":"publish","type":"post","link":"https:\/\/pi3g.com\/de\/stress-testing-a-raspberry-pi-4-with-picockpit-temperature-monitoring\/","title":{"rendered":"Stresstest eines Raspberry Pi 4 mit PiCockpit - Temperatur\u00fcberwachung"},"content":{"rendered":"

Using the new PiCockpit<\/a> v2.0 release, you can monitor the current SoC temperature of the Pi in an easy to use webinterface (in PiStats).<\/p>\n

Simply click on PiStats, <\/strong>and enter temp into the search:<\/p>\n

\"image\"<\/a><\/p>\n

\"image\"<\/a><\/p>\n

this will narrow the display down to just the SoC temperature. The temperature will be updated every second.<\/p>\n

I also recommend you to use the PiDoctor\u2019s System module, on auto-reload to monitor temperature limit, frequency cap and throttling events.<\/p>\n

\"image\"<\/a><\/p>\n

\"image\"<\/a><\/p>\n

scroll down to see the throttling & under-voltage view:<\/p>\n

\"image\"<\/a><\/p>\n

This is the view you would like to see \u2013 the system stays within the temperature limits, there is no throttling \u2013 your Pi operates optimally. <\/p>\n

There are two different deviations from this: currently out of spec (e.g. is currently in under voltage) , or has been out of spec in the past (e.g. had undervoltage since last boot) \u2013 you can see both in this view.<\/p>\n

Create a button to launch stress on the Pi on-demand<\/h2>\n

You will need the command line for this one.<\/p>\n

\n

sudo apt-get update<\/p>\n

sudo apt-get install stress<\/p>\n

sudo nano \/etc\/picockpit-client\/apps\/com.picockpit\/picontrol\/modules\/user.json<\/p>\n<\/blockquote>\n

Enter the following configuration into the new file:<\/p>\n

\n

{
         “name”: “User commands”,
         “icon”: “mdi-test-tube”,
         “handle”: “user”,
         “description”: “User commands for demo of PiControl”,
         “commands”: {
                 “stress”: {
                         “name”: “start stress”,
                         “icon”: “mdi-fire”,
                         “description”: “Puts stress on the Pi CPU to heat it up”,
                         “command”: [“stress”, “–cpu”, “80”]
                 }
         }
\n}<\/p>\n<\/blockquote>\n

Note: Unfortunately WordPress messes up code formatting and characters. Please refer to this screenshot for how the text should look like:<\/p>\n

Tip: you can see a list of all available icons here<\/a> (Material Design Icons).<\/p>\n

\"image\"<\/a><\/p>\n

Save with Ctrl + O, Exit with Ctrl + X<\/p>\n

Then reload picockpit-client.<\/p>\n

\n

sudo service picockpit-client reload<\/p>\n<\/blockquote>\n

In PiControl, a new panel with User commands should now appear:<\/p>\n

\"image\"<\/a><\/p>\n

(no need to reload the website \u2013 it will appear by itself, if the Pi is online and the PiCockpit frontend has a connection).<\/p>\n

A screenshot before starting<\/h1>\n

Here is a screenshot of the output of PiStats before starting Stress:<\/p>\n

\"image\"<\/a><\/p>\n

note the low CPU Load at 1 % and the SoC temperature at 44.303 \u00b0C<\/p>\n

Now click the \u201cStart Stress\u201d button to start Stress. The PiControl screen will change like this:<\/p>\n

\"image\"<\/a><\/p>\n

PiStats with stress running<\/h1>\n

\"image\"<\/a><\/p>\n

As you can see, the CPU load is immediately at 100 %, and the SoC temperature jumped to 61.835 \u00b0C. <\/p>\n

Using different parameters for stress will allow you to vary the load to model a realistic picture of the expected load. <\/p>\n

Additionally, you could load the VideoCore by playing a video for example \u2013 further heating the SoC. <\/p>\n

Continue to monitor the Throttling & under-voltage <\/strong>section in PiDoctor\u2019s System module to see if such events occur. <\/p>\n

Pushing the SoC<\/h1>\n

I put some bubble wrap on top of the Pi, to prevent efficient air circulation, and am also running a video off the Pi:<\/p>\n

\n

omxplayer thais.mp4<\/p>\n<\/blockquote>\n

(You will need to provide your own video file for this, I am using a download of this YouTube video<\/a>)<\/p>\n

These measures, taken together push the SoC to over 80 \u00b0C:<\/p>\n

\"image\"<\/a><\/p>\n

This also shows up in PiDoctor:<\/p>\n

\"image\"<\/a><\/p>\n

In this screenshot you see the ARM frequency cap being activated, to protect the SoC from damage by overheating.<\/p>\n

Further up in the System module, you can also check the current CPU frequency. In this case it was limited to 1 GHz:<\/p>\n

\"image\"<\/a><\/p>\n

The cap is lifted when temperature drops, the frequency goes back to 1,5 GHz (on a Pi 4):<\/p>\n

\"image\"<\/a><\/p>\n

But the fact that there had been a frequency capping event will remain until the next boot:<\/p>\n

\"image\"<\/a><\/p>\n

Tip: in order to prevent overheating of the Pi 4 under massive workloads, we recommend to use the FLIRC case<\/a>. <\/p>\n

<\/p>\n

Stopping stress<\/h1>\n

Keep the window open where you started stress from \u2013 you will be able to stop it here by clicking on Stop process. <\/p>\n

\"image\"<\/a><\/p>\n

Note: you might get a warning message, but CPU usage will drop back to normal, indicating that stress was stopped:<\/p>\n

\"image\"<\/a><\/p>\n

This is the PiCockpit way of things \u2013 of course, you can also simply run stress from the command line (by SSH for example). <\/p>\n

Monitoring temperature this way is great to see the effects of different enclosures & scenarios on your Raspberry Pi. <\/p>\n

<\/p>\n

Installing picockpit-client & using picockpit<\/h2>\n

Click here to read my previous blog post<\/a> about how to use the Raspberry Pi with PiCockpit<\/a>. <\/p>\n","protected":false},"excerpt":{"rendered":"

Mit der neuen Version PiCockpit v2.0 k\u00f6nnen Sie die aktuelle SoC-Temperatur des Pi in einem einfach zu bedienenden Webinterface (in PiStats) \u00fcberwachen. Klicken Sie einfach auf PiStats und geben Sie \"temp\" in die Suchfunktion ein: Dadurch wird die Anzeige auf die SoC-Temperatur eingeschr\u00e4nkt. Die Temperatur wird jede Sekunde aktualisiert. Ich empfehle auch...<\/p>","protected":false},"author":830,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[432],"tags":[897,900,896,898,899,894,895],"class_list":["post-27705","post","type-post","status-publish","format-standard","hentry","category-picockpit","tag-monitor-raspberry-pi-temperature","tag-new-picontrol-button","tag-over-temperature","tag-stress","tag-testing-raspberry-pi","tag-throttling","tag-under-voltage"],"_links":{"self":[{"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/posts\/27705","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/users\/830"}],"replies":[{"embeddable":true,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/comments?post=27705"}],"version-history":[{"count":1,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/posts\/27705\/revisions"}],"predecessor-version":[{"id":27706,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/posts\/27705\/revisions\/27706"}],"wp:attachment":[{"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/media?parent=27705"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/categories?post=27705"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pi3g.com\/de\/wp-json\/wp\/v2\/tags?post=27705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}