[Orca-users] Re: Updating Orca graphs at longer intervals

[Blair Zajac]

Loading data from the percol-* files and loading them into the RRD
files is the most time consuming part.  Orca creates a number of
anonymous subroutines to load the data and then feed it into the
RRD files.

Regarding the lazy option, Orca will only generate the image (GIF or
PNG) files if there is new data to plot, so I don't see the need for
the RRD lazy option.

Having a demand driven image cache would be cool.

Regards,
Blair

pearcec at commnav.com wrote:
> 
> I am running into a similiar problem.  I have five machines I am
> pushing orcallator date from.   I am running with the -o and -r
> switch.  It is still taking
> 
> Current running time is 3:04 minutes.
> 
> real    3m4.583s
> user    2m51.490s
> sys     0m4.160s
> 
> between runs.  When I tell it to run the graphing and the html
> generation (ie no -r), the impact is minimal.  It seems the data
> gathering and rrd insertion is time consuming.  Is there a rookie
> mistake I could be making.
> 
> As far as making graph generation more efficient, it doesn't look like
> you orca makes use of the "lazy" switch that RRDtool provides.  I
> haven't had a lot of time with the code but it might be easy to hack
> it into Orca/ImageFile::_update_graph_options.
> 
>   if ($opt_use_lazy) {
>     push(@options, '-z');
>   }
> 
> Then add this to orca.
>   elsif ($arg eq '-o') {
>     $opt_use_lazy = 1;
> 
> the Orca/Constats.pm's file needs updating too.  If you guys think
> this is a good idea, I could hack it together and generate some
> patches.  I am more concerned with the inputing of data into RRD.  I
> feel it isn't very fast.  Maybe I should move over to the developers
> list.
> 
> The other options, though I am sure you guys don't want to do this, is
> to write a CGI script that will generate the the graphs dynamically.
> (IE only when needed) Then store it in a cache for later hits.  I
> might be able to help with this, the company I work for may allow me
> to build it and release it to orca, but it has to help use accomplish
> what we are trying to do.  Right now I am convice the data updating is
> the problem.
> 
> --
> Christian Pearce
> http://pearcec.fast.net/
> 
> --- In orca-users at y..., Blair Zajac <blair at a...> wrote:
> > Hello David,
> >
> > Currently there is no way to do what you're looking for except by
> > the method you use with -o -r and then -o command line options.
> >
> > It wouldn't be too hard, and I would appreciate the patches, to take
> > some of the code that implements the find_times parameter, such as
> the
> > time parsing, and use it to regenerate the images after a specific
> > time.  If you choose to take on this mission :), I'll send you the
> > latest Orca beta version to work with.  I think naming the new
> > parameter "generate_plot_times" would be a good fit with some new
> > parameters in the next Orca release.
> >
> > Regards,
> > Blair
> 
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