systemmonitor data engine: memory usage? (was: Re: System Monitor)

[Aaron J. Seigo]

On Friday 26 December 2008, Dominik Haumann wrote:
> Huhu,
>
> On Tuesday 23 December 2008, Aaron J. Seigo wrote:
> > On Tuesday 23 December 2008, Dominik Haumann wrote:
> > > into my mind are System Status, System Load Watcher, System Load
> > > Viewer, TimeMon, System Essentials, System Usage, ...
> >
> > System Load Viewer is quite straight forward and "says it all" IMHO. =)
> > hope to see this in 4.3!
>
> Agreed. I'll change this later so it's also reflected in the code.
>
> There still seems to be a problem with regard to calculating the memory and
> cpu usage.
>
> 1. Memory
>    total  = mem/physical/used + mem/physical/free
>    used   = mem/physical/application
>    cache  = mem/physical/cached
>    buffer = mem/physical/buf
>    kernel = mem/physical/used - mem/physical/application
>                               - mem/physical/cached
>                               - mem/physical/buf
>
>    Showing user, cache and buffer is straightforward. In KDE3's applet we
>    also had the kernel memory. This is missing and I'm calculating this
>    as above. What I draw then is not anymore in the contentsRect() (see
>    [1]), so probably calculation is wrong here (and the result looks a bit
>    different compared to what I got in KDE3).
>    Is there any documentation of what exactly those mem/physical/*
>    sources describe? It's unclear.

John Tapsell probably knows this better than anyone else on this list, i'd 
imagine...

> 2. CPU
>    total  = cpu/system/
>    user   = cpu/system/user
>    nice   = cpu/system/nice
>    kernel = cpu/system/sys
>    idle   = cpu/system/idle
>
>    Here the kernel CPU usage sometimes also seems to be less than in the
>    KDE3 version. Maybe here's also going something wrong
>
> Btw, for a screenshot of how it looks like right now, see this link:
>   [1] http://imagebin.ca/view/bLt7Tfv.html
> It's already in pretty good shape.


-- 
Aaron J. Seigo
humru othro a kohnu se
GPG Fingerprint: 8B8B 2209 0C6F 7C47 B1EA  EE75 D6B7 2EB1 A7F1 DB43

KDE core developer sponsored by Qt Software

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