[hobbit] Graph definitions

[Graham Nayler]

Hi Vernon, Phil,

I'm actually using custom scripts, as I wanted a bit more flexible 
formatting in the report. There is however an easier way if you want to have 
a standard NCV report - use SPLITNCV instead of NCV. There was a brief 
question about this back in the summer, but the only source of info I've 
found really is the sourcecode.

In hobbitserver.cfg, instead of NCV_<testname> write SPLITNCV_<testname>. 
Everything else is as for NCV.

This will generate one RRD file for each colon-defined <datasource> line in 
the test file, named "<testname>,<datasource>.rrd" (and yes the first 
separator is a comma). Internally the RRD file datasource is named "lambda", 
as there is only one datasource per file.

Then in the hobbitgraph.cfg definition, use something like

FNPATTERN ^<testname>.(.+).rrd                # yes the first separator is a 
full-stop/period
TITLE and YAXIS as usual
DEF:p at RRDIDX@=@RRDFN@:lambda:AVERAGE
LINE2:p at RRDIDX@#@COLOR@:@RRDMETA@
GPRINT:p at RRDIDX@:LAST:@RRDMETA@ \: %5.1lf%s (cur)

etc

(I assume you know about the replaceable parameters in the definition 
language - it all looked very byzantine when I first came across it a few 
weeks ago, but I can explain it if necessary)

There is a problem though in that SPLITNCV is broken in the version I have 
(4.3 snapshot from August) - it tries defining two datasource lines both 
calls lambda in the same file. You will have to fix one line of code:

In hobbitd\rrd\do_ncv.c, 20 lines from the bottom there is a line
if (split_ncv && (paridx > 1)) {

Change the 1 to 0. Recompile, copy hobbitd_rrd from <build>/hobbitd to 
<hobbit>/server/bin, and restart hobbit. It then works.

If you want to go the external script route, that snapshot was also broken, 
but I believe it is now fixed in the latest snapshot. The way I did it is in 
these two replies:
http://www.hswn.dk/hobbiton/2008/10/msg00159.html
http://www.hswn.dk/hobbiton/2008/10/msg00248.html

Graham Nayler


----- Original Message ----- 
From: "Everett, Vernon" <Vernon.Everett at woodside.com.au>
To: <hobbit at hswn.dk>
Sent: Thursday, October 30, 2008 1:34 PM
Subject: RE: [hobbit] Graph definitions


Hi Phil

Have you, or anybody else on the list, got an example of such a script?

Thanks
    Vernon

-----Original Message-----
From: Phil Wild [mailto:philwild at gmail.com]
Sent: Thursday, 30 October 2008 4:43 PM
To: hobbit at hswn.dk
Subject: Re: [hobbit] Graph definitions

Hi Vernon,

You need to write your own backend data collector and have hobbit pass the 
data to it through a change in hobbitlaunch. You parse the data yourself at 
the server side and then build a single rrd file for every entry. You then 
use the FNPATTERN as you have already specified...

>From memory, I think this is lightly covered in the man pages.

Cheers

Phil

2008/10/27 Everett, Vernon <Vernon.Everett at woodside.com.au>:
> Hi all
>
> Is there any way to define a graph definition for values that may or
> may not be available.
>
> Let's work with CPU temperature, just as an example.
>
> In hobbitserver.cfg, I can define this NCV_systemp="*:GAUGE"
> (And the other ncv definitions)
> It then generates rrd files for all the servers.
>
> However, some systems have 1 cpu, some have 2, and some 4.
> So the rrd files only have entries for the number of CPUs.
>
> In the hobbitgraph.cfg we can define the graph, with 4 cpu
> temperatures, but if the rrd file doesn't contain 4 fields (i.e.
> system has only 2 CPUs), it doesn't generate a graph.
> It is also not possible to have a separate graph definition for 1, 2
> and 4 CPU systems.
>
> The other way round it, is to have each CPU in a separate file, and
> define FNPATTERN= with a wildcard.
> But how do we get the ncv module to put each field in a sepreate rrd file?
>
> Regards
>      Vernon
>
>
>
>
>
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