[hobbit] Graph multiple unknown named RRD values in one graph

Hubbard, Greg L greg.hubbard at eds.com
Mon Aug 18 18:19:59 CEST 2008

I think you need the separate RRD file for each element you want to
graph, with a naming convention.  Then the hobbitgraph definition can
"wildcard" the file names to put the graphs together.  This is what is
done for disk graphs, and network interface graphs, etc.
I know nothing about NCV, but it is pretty easy to do this if you write
your own script for processing custom tests.  Then you can control how
each RRD is created, and enforce your own naming convention.  The trick
is to thoroughly understand how the current "multi-graph" tests work,
and then try to duplicate them with different data.


	From: Michael Hobbs [mailto:michael.hobbs at infusionsoft.com] 
	Sent: Monday, August 18, 2008 11:05 AM
	To: hobbit at hswn.dk
	Subject: Re: [hobbit] Graph multiple unknown named RRD values in
one graph
	The issue with modeling the disk definition is that it seems to
automagically create separate rrd files but reports them as a single
test. It seems I would need to send a different $COLUMN for each JVM
name in order to have hobbit create multiple rrd files with a single
dataset in them. Is this correct? If so, then wouldn't I also need to
define each $COLUMN's NCV entry in hobbitserver.cfg? It seems no matter
how hobbit allows me to do it, I need to explicitly define each JVM
name. Have I reached the end of hobbit's graphing abilities or am I just
going about this the wrong way?
	On 8/18/08 2:13 AM, "Charles Jones" <charles.r.jones at gmail.com>

		I am really rusty on dealing with NCV stuff..I know
there is a way to do what you want, but not sure offhand of the proper
syntax and whatnot.
		As you suspect, look at the disk definition in
hobbitgraph.cfg. Note that it is basically using variables for the DEF,
LINE2, and GPRINT options. There is also the use of a wildcard in the
rrd name definition, which comes in handy if there are multiple rrd
files you are dealing with, in which case you would use:
		FNPATTERN (.*).web
		However, from your description it sounds like you
probably have a single rrd file that has multiple DS entries in it,
which I have never dealt with.
		Looking at the [vmstat] definition, I can see an example
of pulling multiple values from a single rrd file, but you want to do it
dynamically, using a variable for the DS instead of static
		I just had a look at some of the source code
(hobbitgraph.c), and so far it looks to me like that feature is just not
implemented. :(
		Unless Henrik or someone can reveal the way to do it, it
sounds like you are stuck with defining static DS names. Have a look at
the [vmstat] definition in hobbitgraph.cfg, which should give you a good
idea of how to build your own [jvm] graph definition, by using multiple
DEF entries which specific the explicit DS names, example:
		P.S.  The man page for "rrdcreate" gives some great
insight into the structure and use of rrd files.
		P.S.S. You could also consider using something external
like Cacti to create and display those particular graphs. 
		On Thu, Aug 14, 2008 at 11:25 AM, Michael Hobbs <
michael.hobbs at infusionsoft.com> wrote:

			Hi all,
			I have spent the last day reading documentation
and searching the "tubes" for an answer without any luck. Here is my
			I have multiple hosts reporting JVM free memory
numbers in the following format. Each line is a different JVM name with
its current free memory number.
			 mn17camp.web: 846
			 mn18camp.web: 669
			 mn19camp.web: 337
			 mn30camp.web: 938
			 mn31camp.web: 750
			 mn32camp.web: 812
			 mn33camp.web: 723
			 mn5camp.web: 785
			 mn63camp.web: 179
			 mn65camp.web: 518
			 mn6camp.web: 597
			 mp3camp.web: 673
			 tbo1camp.web: 461
			 tbo2camp.web: 1030
			 tbo3camp.web: 490
			I have hobbit saving them to an rrd file using
the data channel in the ncv format. Is there a way to graph these
without explicitly defining each jvm name? i.e. Can I iterate through
whatever names are in the file? Or can I have hobbit create different
rrd files based on content of the ncv file? I'm guessing it could be
similar to how the disk test does it. 

	Michael S. Hobbs
	sr. systems administrator
	Phone: 480.289.6832 | Fax: 480.807.0665
	michael.hobbs at infusionsoft.com | www.infusionsoft.com


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