[rrd-developers] rrdtool fetch / JSON-Output

Joshua Keroes joshua at keroes.com
Thu Jan 12 23:59:08 CET 2012


On Thu, Jan 12, 2012 at 2:53 PM, Michael Markstaller <mm at elabnet.de> wrote:

> Hi,
> my first post to the list and to be honest: I havent followed this list
> and rrdtool development for many years though using it widely & every
> single day. It just worked to well ;)
> I created a little patch to make "rrdtool fetchj .." simply output json
> instead of text, attached.
> Intentions, the answers to why etc:
> - Target-Platforms are rather low-end (AMD Geode, OpenWRT Routers), so
> with rrdtool 1.3, 1.4 was dead slow in graphing on these low-ends during
> my tests.
> - avoid (another) shellscript or CGI to wrap "rrdtool fetch" output into
> JSON what I needed to feed jQuery/Flot in this case.
> - but "rrdtool fetch" does exactly what I need, with all it's benefits,
> fast, small data to transfer, right data, autoscaling etc.pp.
> Please let me know your thoughts, if it makes sense at all.
> I know for sure that a patch against an rather old version isn't perfect
> but it was as mentioned chosen precisely..
> Could also do it for current 1.4/trunk but it's currently not my goal
> because of serious performance-problems (which might have many other
> causes than rrdtool itself for sure!)
> best regards
> Michael Markstaller
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