SUMMARY Option "Divide CPU usage by number of CPUs" does not affect the darker histogram in CPU usage field, which seems to be always divided by the number of CPUs. SOFTWARE VERSIONS (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
Sorry, I do not understand your issue. Please be more specific: 1) What are you doing? 2) What is the result? 3) What result do you expect? Thanks.
Created attachment 118729 [details] Screenshot of issue
With reference to the picture in comment 2, you can see four applications running with full CPU usage. Under the number representing the usage percentage, there are two histograms, a light blue one and a dark blue one. As far as I understand, they indicate the instantaneous and time average cpu usage, or some variation of these. The point is that since the cpu is running at constant load, they should overlap. If I toggle "Divide CPU usage by number of CPUs" then the lighter one is resized to 1/4 of its height and kinda overlaps with the darker one. My understanding is that the same should happen even if I toggle the same option again, and both histograms should cover the whole area and overlap.
Ah, I see - never noticed that there are actually two graphs in the CPU % column... If you hover over the process you can see that it tracks user cpu and system cpu usage separately. And if you add these two you get the number listed. So the obvious explanation would be that the two grahs represent user cpu and system cpu. However these number doesn't match the actual graph... Unfortunately the CPU histogram feature isn't mentioned at all in the documentation: :-( https://docs.kde.org/index.php?application=ksysguard However in any case I can see that the dark graph isn't affected by the option "Divide CPU usage by number of CPUs".
ksysguard is no longer maintained, in Plasma 6 there is the Plasma system monitor for this task. If your issue still happens with the Plasma 6 replacement, please re-open and we can move this bug to the new product, thanks!