Aha! After reading the rrdgraph man pages on the net and screwing
around a bunch, I modified the code in find_limits to look like:
$command = RRDTOOL . " graph /tmp/dummygangliagraph.out ".
"--start $start --end $end ".
"DEF:limits='$rrd_dir/$metricname.rrd':'sum':AVERAGE ".
"VDEF:limitsmax=limits,MAXIMUM ".
"VDEF:limitsmin=limits,MINIMUM ".
"PRINT:limitsmax:%.2lf ".
"PRINT:limitsmin:%.2lf";
The dummy output filename was critical to get any output at all. Other
changes avoid deprecated syntax or make the code match the documentation.
Thanks, Chuck
Jason A. Smith wrote:
Hi Chuck,
This is how it works for me. The cluster_view.php code sets a min & max
value, using the find_limits function in functions.php. Then the
graph.php code uses these values to set the rrdtool upper & lower limits
in the graphs. About a year ago I discovered a bug that might have been
related to the version of rrdtool that I was using, which effectively
broke the find_limits function. I reported this to ganglia's bugzilla:
http://bugzilla.ganglia.info/cgi-bin/bugzilla/show_bug.cgi?id=37
Maybe you are affected by the same problem.
~Jason
On Wed, 2006-05-10 at 12:10 -0700, Chuck Simmons wrote:
I want to display multiple graphs with the same upper-limit value.
Basically, I need to obtain the maximum upper limit from across the
graphs (or a good estimate thereof) and then use that when displaying
the graphs.
For example, on cluster_view.php, we will display one graph for each
node in a cluster. The graph displayed is chosen by the user from a
pull down menu. At the current times, the graphs are displayed at
widely different scales, and a human cannot quickly graph at the screen
to determine which nodes have the highest values. The human's life
would be easier if all graphs used the same scale.
What are the 10 best ways to implement a solution to this problem?
Thanks, Chuck
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