Re: [PyMOL] graphics performance

[Dirk K. <dir...@ps...>]

Dear Gordon,

I assume that you changed the default "nv" driver in your XF86config(-4) =
file=20
to the Nvidia driver "nvidia". I've replaced on my private Pentium III (7=
33=20
MHz) PC a GeForce2 GTS against a GeForce4 Ti4200 and I also observe less=20
improvement than expected. Here are my observations:
1. Under Windows98SE with 3DMark2001 I get a ~50 % higher score, which is=
=20
probably okay.
2. Under Linux I get a ~ doubled frame rate for the simple OpenGL benchma=
rk=20
program "gears" in full-screen mode and somewhat less than this in the=20
Vulpine OpenGL Mark, which is fine (Nvidia driver 31.23).
3. But, puzzlingly with pymol and on-screen rendering of a complex second=
ary=20
structure sketch (without ray-tracing) I only get a moderate increase (~ =
10=20
%, or so) of the movie frame rate compared to a Geforce2MX440 running on =
a=20
Pentium III (450 MHz) in my office! Here, I would really expect a huge=20
difference in frame rate. I also don't understand this. A possible=20
explanation would be that pymol, upon automatic detection of the graphics=
=20
card, internally changes the complexity of the calculations resulting in =
a=20
slower but improved image?

Best regards,

Dirk.

On Wednesday 08 January 2003 09:40, gordon wrote:
> Hi
> I recently upgraded from a geforce 2 to a geforce 4 ti4200, and I don't
> really notice a performance improvment (running linux). I judge this
> based on how smoothly large sized proteins can be rotated with spheres
> on.
> Just wondering why?
>
> Thanks in advance
> Gordon

--=20

****************************************
Dirk Kostrewa
Paul Scherrer Institut
Life Sciences, OSRA/007
CH-5232 Villigen PSI, Switzerland
E-mail: dir...@ps...
Phone: +41-56-310-4722
Fax: +41-56-310-4556
WWW: http://www.sb.psi.ch
****************************************