https://bugs.kde.org/show_bug.cgi?id=437124

            Bug ID: 437124
           Summary: Update System Monitor to Match System Load Viewer
                    Features
           Product: plasma-systemmonitor
           Version: 5.21.5
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: ksysguard-b...@kde.org
          Reporter: wedge...@wedge009.net
                CC: ahiems...@heimr.nl, plasma-b...@kde.org
  Target Milestone: ---

Created attachment 138436
  --> https://bugs.kde.org/attachment.cgi?id=138436&action=edit
System Load Viewer in Plasma 5.18

This feature request/report was borne out of the discussion in
https://invent.kde.org/plasma/kdeplasma-addons/-/merge_requests/68, which
itself was a result of System Load Viewer being 'killed' off in
https://invent.kde.org/plasma/kdeplasma-addons/-/merge_requests/27. It appears
System Load Viewer is no longer desirable and future use/development should be
on this System Monitor widget instead, which unfortunately does not (yet) quite
match the old viewer in terms of appearance nor functionality.

Summary:
1. Restore ability to configure update interval (refresh rate of the viewer).
2. Restore Compact Bar view.

For point 1, this should be self-explanatory.

For point 2, this involves a number of things:
* Compact Bar greatly reduces the space taken by the widget (very important,
for example, with CPUs with many cores/threads, such as Threadripper).
* The System Monitor uses colour only to represent different cores/threads, but
the old System Load Viewer used consistent colours to represent
user/system/nice/io CPU usage per core/thread which provides much more
information in less space.
* Additionally, while the old System Load Viewer showed both CPU and Memory
usage together in one widget, replicating this functionality with System
Monitor requires at least two widgets - one for CPU and one for Memory - with
the latter taking up far too much room in terms of width (I recognise pie chart
is the default). Likewise with CPU, it only shows overall memory usage and does
not distinguish between application data and disk buffers/cache. At least allow
the bar chart view to use less space if there's only a single data point, or
perhaps allow for configurable width.

This report may well be a duplicate of, or at least overlap with,
https://bugs.kde.org/show_bug.cgi?id=437114

Kubuntu 20.04 vs 21.04
Plasma 5.18 vs 5.21

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