On Dec 4 2012 9:06 AM, Kent A. Reed wrote: > > In addition to latency-test there is a script called "latencyplot" > that > possibly could give some insight. I have spent time staring at the > rolling plot trying to discern regularities in the jitter (like when > I > suspect a BIOS and SMI are doing some fancy footwork). > > I had conjectured on emc-users about how one might go about making an > external pulse-train analyzer which, like Michael's digital logic > analyzer, would be able to generate histograms but over a longer time > scale. If one is satisfied that the internal, latency-test approach > provides a reasonable metric, then it would be dead-simple to take > latency-test/latencyplot a step further, bin the results, and derive > interesting measures from it. Like latency-test, one could provide a > running tally of key measures or like the OSADL does for its > RT-Preempt, > one could draw histograms and analyze exhaustively on demand.
I'm not a statistician, but have been involved with some wicked cool statistical analysis projects in the distant past. I wonder if there is anyone in the group who knows how to use R well enough to help design and set up a study to tease out various things like outliers, the spectral density, ... I am not sure what all, but that would be a formal way to get at what you are talking about. The nice thing is that R might already have the nasty bits like sapa, quantspec, spectralGP, or possibly BaSAR. I'm not realistically going to have the time to delve into this, but thought I would throw out the idea... EBo -- ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
