[rrd-users] Graphing ccache statistics
lists at edeca.net
Wed Sep 15 16:11:16 MEST 2004
I'd like to graph ccache statistics but I'm unsure if rrdtool would be the
right way to do this. A sample (snipped) output from it is below:
desktop david # ccache -s
cache hit 951
cache miss 377
files in cache 754
cache size 5.1 Mbytes
As these figures aren't going to change much in 5 minutes, I feel it would
make sense to log the numbers every 30 minutes for a week, then every day for
a year. I have other graphs that seem to work well with these time periods.
However, the numbers from ccache aren't a rate or average, they're a total of
how many times the cache has been hit since the counters were last reset.
When reading them, for example every 30 minutes, I would reset the hit and
I already have other graphs for partition space usage so I am fairly sure
"cache size" would be graphed fine, I am just unsure about the hit and miss
and total files.
Does it make sense to graph these figures using rrdtool? Should I be using
GAUGE or is it an ABSOLUTE? I think it would be ABSOLUTE for hit and miss
(as they are reset upon reading) and GAUGE for the total files and cache
size. Which consolidation function should I use for the RRA?
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