On Wednesday 05 December 2012 14:33:01 EBo did opine: > On Dec 5 2012 9:03 AM, Kent A. Reed wrote: > > On 12/5/2012 4:16 AM, EBo wrote: > >> On Dec 4 2012 9:06 AM, Kent A. Reed wrote: > >>> <...> 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 -- > > > > I love exploratory data analysis. Over the years it proved invaluable > > first in my degree work (I owe my degree to it) and later in my > > professional research. Fancy analysis---and R would be a great > > tool---can come later, but always start with plots to get a feel for > > the > > problem at hand. > > > > I'm shooting for a histogram plot by this weekend.
That data would be easier to collect if latencyloop could keep a log, hint hint. My b.max is now at 18 microseconds, s.max is about 15, but the averages are in the 5 range. 31xxx runtime now. > Agreed. Most people are surprised at just how much leverage you can > get by just taking the mean. Fancy or not, the questions I would like > to see answered are: > > *) what is the mean and std of the the latencies. > > *) are there any outliers (blown constraints). This could get fancy > quick, but anything simple to start would be more than fine. > > *) if there are any outliers are they grouped? By how much are they > off? How often do they happen? Again, these questions could get > advanced quick, but your histogram should allow us to visually inspect > the results and make an intuitive guess. > > 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 Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! It's the Magic that counts. -- Larry Wall on Perl's apparent ugliness I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ 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
