[rrd-developers] Re: [Fwd: [Ganglia-general] rrdtool patch to guarantee 2 vertical grid labels.]

[Jason A. Smith]

On Fri, 2006-04-14 at 22:01, Jason A. Smith wrote:
> Resending email after subscribing to list.  :)
> ~Jason
> 
> 
> 
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It looks like the list software didn't like my attached email message, I
will try again...


On Fri, 2006-04-14 at 18:13, Jason A. Smith wrote: 
> In our experience, ganglia's use of rrdtool to make the metric graphs
> will often result in only a single 0 y-axis grid label, especially on
> the small graphs.  This makes the graph almost useless since there is no
> vertical scale information.  I looked at the rrdtool source code and
> came up with the attached patch, which will guarantee the addition of a
> second y-axis grid label, if only one has been added so far and the
> current grid line is the last available one where a label can be added,
> as it loops through adding all of the grid lines.
> 
> Since we are still using rrdtool 1.0.50 here, this is the only version
> of the patch that I have tested, and it seems to work well.  I made a
> similar patch for version 1.2.12, but it is untested.  I tried compiling
> the stock 1.2.12 version of rrdtool on a RHEL4 system, but it failed and
> I haven't had the time to investigate further.
> 
> I also attached two images from ganglia to illustrate the problem,
> showing the same graph before & after my patch.  I am sending this email
> to the rrdtool developers list to see if they will consider including
> it, and also to the ganglia user's list in case any other ganglia users
> would like to try it.
> 
> ~Jason



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