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

Michael Hobbs michael.hobbs at infusionsoft.com
Mon Aug 18 18:04:42 CEST 2008

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> wrote:

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 definitions...hmm

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 scenario.

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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