[ODE] More speed???

[gl]

Yes, great work!  Keep at it : ).
--
gl

----- Original Message ----- 
From: "Anselm Hook" <anselm at hook.org>
To: "Nguyen Binh" <ngbinh at glassegg.com>
Cc: <ode at q12.org>
Sent: Tuesday, November 04, 2003 7:43 AM
Subject: Re: [ODE] More speed???


>
> That sounds great!
>
>  -a
>
> On Tue, 4 Nov 2003, Nguyen Binh wrote:
>
> > Hi list,
> >
> >    I'm deep in optimizing ODE (mostly for speed). Here are some of my
> >    observations:
> >    + There are many places to optimize in ODE
> >    + After just removing some dSetZero() calls and making use of
> >    dSetZeroSSE(), I found that original Step rountine is no longer too
> >    slow compare to Stepfast
> >
> >    Most obvious ways to optimize:
> >    a) Original Step code path:
> >       The two most expensive functions are dSolveL1() and
> >       dSolveL1T() (each of them take roughly 20% programs's CPU power).
> >       These two function's purpose is to solve linear problem A.x = b
> >       This result surprise me much.
> >            -These two function can be SIMDize
> >             easily. I have not tried it yet but I'd bet it will make
> >             original Step() much faster.
> >            - Or we can solve them using "iterative" method
> >              (Refer to ftp://ftp.netlib.org/templates/templates.ps
> >              it's a great source)
> >
> >    b) Stepfast code path:
> >       Stepfast use "iterated/relaxation" method to solve for
> >       constaints. But it used LCP routine specialized for "big
> >       matrix". Actually, all matrix passed to LCP have small dimension
> >       (<6??).So one way to optimize is using specialized LCP for small
matrix
> >
> >    FYI,luckily, I have chanced to use Havok2 in my work, my impression
> >    is ODE is not too bad compare to Havok2 :).
> >
> >    Happy coding!
> >
> > --
> > Best regards,
> >
> > ---------------------------------------------------------------------
> >    Nguyen Binh
> >    Software Engineer
> >    Glass Egg Digital Media
> >
> >    E.Town Building
> >    7th Floor, 364 CongHoa Street
> >    Tan Binh District,
> >    HoChiMinh City,
> >    VietNam,
> >
> >    Phone : +84 8 8109018
> >    Fax   : +84 8 8109013
> >
> >      www.glassegg.com
> > ---------------------------------------------------------------------
> >
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