[rrd-developers] Re: [rrd-users] Re: Image clipping/stacking want

[Alex van den Bogaerdt]

Sasha Mikheev wrote:

> Let me add another vote for separating data processing and retrival from
> graphing. It would be very nice to get tabular data for complex graphs in
> rrdtool fetch.

This would be nice, but we need to make sure the input is suitable for
rrdtool graph.  If the DEF command works on other datasources than RRDs,
one side of this is done.  The other side would be writing out processed
data not to a graph but as text, like PRINT but now the complete series.

> Also my favorite features would be:
> 
> 1. Pluggable modules for RPN operations.


Something like:
usr(x) --->
FUNC:myfunc=/usr/local/bin/myfunc
CDEF:vname=whatever,myfunc

?


> 2. Aggregate operations such as average, percentile etc in CDEF and PRINT
> It should work like this:
> foo=CDEF:bar,95,PECENTILE
> now bar will be a constant series and you will be able to graph it.

This is *very* similar to the stuff I'm currently working on.  It will
use variables which you can use in CDEF instructions something like:
DEF:bytes=...
CDEF:bits=bytes,8,*
VDEF:perc=95,bits,PERCENT
CDEF:high=bits,perc,-,100,LE,INF,UNKN,IF
AREA:high#FF0000
AREA:bits#0000FF:bits
LINE1:perc#FF0000:"95th percentile"

cheers,
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