Tom, Your implicit assumption is correct: RRDtool is a great tool, but not for this sort of task. Indeed, the data extrapolation is a big part of what makes rrdtool so useful for tracking data such as network throughput, web site hits, and so on.
Perhaps others on the list can suggest a good plotting tool that will generate rrdtool-like graphics? Depending on the tool you select, the database question might also be answered. Andy On Tue, 2009-04-21 at 22:31 +0000, Tom Vaughan wrote: > Hi, > > I've read the documentation and tutorials at: > http://oss.oetiker.ch/rrdtool/. And I see that rrdtool requires data > at specific intervals, and that if data is not inserted at exactly the > right moment, then the data may be "altered" according to: > http://oss.oetiker.ch/rrdtool-trac/wiki/RrdFaq#RRDtooldoesnotreturnwhatIputin. > > I have a system that takes measurements every 10 ms or so, and > performs calculations on these measurements anywhere between every 50 > ms and 100 ms. For the purpose of discussion, let's just say that the > exact interval within this range is random. I need to be able to store > the measurements and calculations for later display and analysis. I > need to know exactly when the data was acted upon (by a measurement or > a calculation), and I need to have access to the exact data. So I > can't tell rrdtool at what exact intervals I plan to store data. > > The data is structured. It's the same data set every time. And I need > to produce strip charts like rrdtool provides. I also need to do more > calculations on the data that is stored, which I think I can do easily > with RPN. I also need a data "storage" mechanism. Although I can't > overwrite the data as is done in typical round-robin fashion. But I > think I can just make a database that is large enough to never be > overwritten. > > Is rrdtool the tool for me? > > Thanks. > > -Tom > > _______________________________________________ > rrd-users mailing list > [email protected] > https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
