[rrd-users] Re: Monitoring each CPU in a SMP server

[Alex van den Bogaerdt]

Thomas Erskine wrote:

> >  But for each CPU you have 4 lines (user,nice,system and idle) so could be
> >very confused graph......
> >
> >  I think about stack areas, but with two CPUs you have a very big graph.
> 
> Was this question "how do I make such a graph", or "how do I combine all 
> this information into a comprehensible graph"?  I agree that cramming 
> multiple CPUs onto one 2D graph is going to be confusing.  For 2 CPUs, you 
> could have one be positive and one negative, or one as stacked lines and 
> one as stacked areas.  For more, I think that it'd be better to have one 
> graph per CPU and put up a page with all the different CPU graphs on one page.

One could also stack the numbers from the 1st CPU,  then use an invisible
area covering 100% and stack the numbers of the 2nd cpu on top of that one.

Assuming all numbers are percentages:

   AREA:num1a#FF0000:"cpu 1 user"
   STACK:num1b#00FF00:"cpu 1 system"
   STACK:num1c#0000FF:"cpu 1 nice"
   STACK:num1d#000000:"cpu 1 idle\n"
   CDEF:hundred=num2a,POP,100     <----- trick to get a number only
   AREA:hundred                   <----- note: no color, no legend
   STACK:num2a#FFFF00:"cpu 2 user"
   STACK:num2b#00FFFF:"cpu 2 system"
   STACK:num2c#FF00FF:"cpu 2 nice"
   STACK:num2d#000000:"cpu 2 idle\n"

If it is sure that 1a+1b+1c+1d add up to 100 exactly, the two lines with
"hundred" aren't even necessary.

HTH
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