Question #177524 on Graphite changed: https://answers.launchpad.net/graphite/+question/177524
Mark Seger posted a new comment: Thanks for the timely response. I'm definitely happy to hear it has a distributed model which we all know is really the only way to scale. Sounds like definitely worth taking a closer look at when I get some more time. As for the number of datapoints vs pixels, this is the EXACT problem I have with rrd. As you change the the time scale of the display, the graphs themselves can actually change and I think that's a huge no-no. The bottom line is by default, collectl generates 8640 data points/day at a 10 second monitoring interval and I will typically look at a day's worth of data to see if there are any spikes. RRD, and it sounds like graphite too, cannot fit all those points on a graphs and so averages them, destroying the spikes. For that reason my tool of choice has always been gnuplot which is fast and plots everything you tell it to. If a few points fall in the same interval, gnuplot simply plots all them and you can clearly see the spikes. I don't know if graphite has the ability to display multiple points at the same time as it would clearly break the 'prettiness' of the plots, but I don't care about pretty, I care about accuracy and I'm afraid this would be a show stopper for me, at least as for using graphite as a diagnostic tool. Has anyone considered alternate plotting styles for when this is a concern? Does graphite actually build the plots itself or does it rely on some other tool? If the former, in theory it shouldn't be that difficult to support an alternate style. I realize most people probably don't get into that level of analysis of the data, but that has always been the #1 consideration for me - accurate data by which you can then do detailed analysis of most system /cluster-wide problems. I've always wondering how many people think their systems are running just fine when in fact there are all kinds of horrible things going on that they don't know about because they're either monitoring at a granularity of a minute or more and/or are using rrd and not seeing any real problems. re <1 second intervals: not really a big deal as 1 second is usually more than sufficient for looking at data in real-time. -mark -- You received this question notification because you are a member of graphite-dev, which is an answer contact for Graphite. _______________________________________________ Mailing list: https://launchpad.net/~graphite-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~graphite-dev More help : https://help.launchpad.net/ListHelp
