[rrd-users] Two graphs with the same scale?

[Sam Rowe]

On Mon, May 07, 2007 at 08:51:40AM -0400, Sam Rowe wrote:
# Hi,
# 
# I'm trying to create two graphs with exactly the same scale and I'm
# having trouble.
# 
# I create the first graph like so:
# 
# /usr/bin/rrdtool graph ./graphs/sam-0-c.png --only-graph -i -E -N -M -Y \
#    -s 1178020825 -e 1178024425 (...)
# 
# and I have some PRINT statements that print the max value for each line
# in the graph. I then take the highest of those values, multiply it by
# 1.1 and use it as the upper limit to create my other graph like so:
# 
# /usr/bin/rrdtool graph ./graphs/sam-0-l.png --only-graph -i -E -N -M -Y \
#    -s 1178017225 -e 1178020825 \  --rigid --upper-limit 8.107 \
#    --lower-limit 0 (...)
# 
# This seems to work flawlessly unless the upper limit is less than 2. If
# the upper limit is less than 2, it seems like some other algorhythm is
# used to determine the scale of the graph.
# 
# I've looked through rrd_graph.c, but must confess that C is greek to me.
# 
# Any help appreciated. Thanks :)

Oh and I'm using rrdtool 1.2.11 if that matters. (and can upgrade if
necessary.)