• I explain more my critics about the USL methodology...

    From Ramine@21:1/5 to All on Fri Apr 15 15:29:22 2016

    I explain more my critics about the USL methodology...

    If you have read my previous post, i have based my proof on
    this affimation that is more ituitive, read it carefully:

    "I have just thought about his methodology of using Parallel
    systems as a black box using mathematical regression to quantify
    and predict scalability, and i think he is wrong doing it so,
    because when the serial part is for example 1/8 of the parallel part,
    you can probabilistically get much more scalability with less parallel
    threads and less cores than when testing with more and more cores,
    because with more and more cores you will get more and more contention
    on the serial part , so the Dr. Gunther methodology fails , because
    it is testing the system with less cores and less threads, so it will
    not get and predict the right or a better approximation of the
    scalability" [1]

    And if you look at the following web page from Dr. Gunther:


    He is applying the USL methodology to a mixed workload to
    predict the response-time etc.

    But i think he is wrong, because there is an unknown that
    is the number of cores and the number of server threads on
    the server side of the database system, so you can not more
    exactly predict scalability because as i said in [1] above,
    you can not predict in general how much contention there is
    on the serial part represented by coefficient Alpha and you
    can not predict how much cross-talk there is represented by
    the Beta coefficient.. so i hope that my more intuitive
    affirmation [1] above is clear.

    So i say that Dr. Gunther methodology of USL fails and is
    not the right tool, and more than that , as i said before it is not
    suited for critical systems that demand and require us to know
    the worst-case performance.

    Thank you,
    Amine Moulay Ramdane.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)