Thanks Manuel for your reply, my mail was meant to be sent to the list, but the reply-to field points to you, so I'm forwarding your reply to the list right now.
Mirko
On Thu, May 19, 2011 at 2:44 PM, Mirko Buffoni <[email protected]> wrote: > At 13.13 19/05/2011 +0200, you wrote: >> >> One more thing: in the test2 you can use the mouse to move the graph: >> click and drag to move sideways, and to zoom use the wheel. > > WOW! > > First of all, my hat off for such a great achievement. > I let my jaw literally fall down after seeing 'test2'. > So this is a 'Bravo' for sure! > > Now the only drawback I see in this design is the amount of data which > is transferred to the client. Basically you're parsing a real rrd database > transferred and cached by the client browser, and which basically > changes of a few bytes every tick, but that to the browser > appears to be refreshed entirely. This would be a hit for graphs which are > an aggregate of more .rrd files (dns/mysql to cite some). > > An interesting point would be to ask the server to send back data for > the construction of the canvas graph. But how much useful would this be > over a plain .png generation? I think I'd have to check how google caches > data for graph generation in their finance webapp. > > Anyway, congratulation again for your work! :) > > Mirko > > The idea for the rrd files was to test the rrdgrah using the command line syntax of rrdtool, We can implement another function like rrd_fetch to download the data via a json like Collection4 do. Another idea could be update the graphs in real time without downloading all the data, or the data of last hour, I'm not sure about the way to do this with collectd, maybe with a subscription mechanism.
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