[rrd-users] rrdtool takes a while to generate ganglia graphs

chrismattmann chris.mattmann at jpl.nasa.gov
Tue Nov 25 19:49:37 CET 2008

chrismattmann wrote:
> Hi,
> I'm having some trouble with rrdtool as it is being called by Ganglia. I'm
> using the following software:
> Ganglia: 3.1.1
> rrdtool: 1.1.3
> Cent OS 3, 2.0 GB RAM, Dual dual-core Xeon 2.8 GHz
> I am having a similar problem as this fellow here:
> http://oss.oetiker.ch/rrdtool/forum.en.html#nabble-td1450436
> It seems that when I visit the Ganglia main page, it hangs for about 3-5
> seconds, after which all of the rrdtool graphs are generated very quickly
> and come back at the same time. When I look at top on my host machine for
> Ganglia and rrdtool, I notice that when the rrdtool processes are
> launched, they all start taking a bunch of CPU and memory, and then at
> around the same time for all of them, poof, they dissapear and then the
> system returns to normal. Any clue as to why this would be? I've installed
> rrdtool before and Ganglia, and never had this type of problem. I'm
> starting to scratch my head here because I'm not sure what's going on...
> Thanks for any help you can provide.
> Cheers,
>  Chris


I wanted to amend my earlier post: I'm actually using rrdtool-1.3.3, not
1.1.3. Sorry for the confusion. So, yes, I am using the new version that
uses mmap and has better IO, yet I am still seeing this behavior. Does
anyone have any idea as to why?


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