[PyMOL] graphics performance
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 -- Gordon Wells Department of Biochemistry University of Pretoria
Re: [PyMOL] graphics performance
Dear Gordon, I assume that you changed the default nv driver in your XF86config(-4) file to the Nvidia driver nvidia. I've replaced on my private Pentium III (733 MHz) PC a GeForce2 GTS against a GeForce4 Ti4200 and I also observe less improvement than expected. Here are my observations: 1. Under Windows98SE with 3DMark2001 I get a ~50 % higher score, which is probably okay. 2. Under Linux I get a ~ doubled frame rate for the simple OpenGL benchmark program gears in full-screen mode and somewhat less than this in the Vulpine OpenGL Mark, which is fine (Nvidia driver 31.23). 3. But, puzzlingly with pymol and on-screen rendering of a complex secondary structure sketch (without ray-tracing) I only get a moderate increase (~ 10 %, or so) of the movie frame rate compared to a Geforce2MX440 running on a Pentium III (450 MHz) in my office! Here, I would really expect a huge difference in frame rate. I also don't understand this. A possible explanation would be that pymol, upon automatic detection of the graphics card, internally changes the complexity of the calculations resulting in a 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 -- Dirk Kostrewa Paul Scherrer Institut Life Sciences, OSRA/007 CH-5232 Villigen PSI, Switzerland E-mail: dirk.kostr...@psi.ch Phone: +41-56-310-4722 Fax: +41-56-310-4556 WWW: http://www.sb.psi.ch
Re: [PyMOL] graphics performance
Hi Dirk This might actually be a hardware affect rather than a software effect. The GeForce4 is undoubtably quicker that the GeForce 2 bu there comes a time when the actual CPU is lagging behind in the amount of data it can pass to the GPU- this also includes other limitations such as the graphics apature size setting in the bios, the amount of RAM available to the machine and the speed of the AGP BUS. Putting a GeForce4 into a PIII means the GPU will be idling a lot probably upgrading the motherboard, RAM and CPU will yield improvements, better graphics cards most likely won't. Jules On Wed, 8 Jan 2003, Dirk Kostrewa wrote: Dear Gordon, I assume that you changed the default nv driver in your XF86config(-4) file to the Nvidia driver nvidia. I've replaced on my private Pentium III (733 MHz) PC a GeForce2 GTS against a GeForce4 Ti4200 and I also observe less improvement than expected. Here are my observations: 1. Under Windows98SE with 3DMark2001 I get a ~50 % higher score, which is probably okay. 2. Under Linux I get a ~ doubled frame rate for the simple OpenGL benchmark program gears in full-screen mode and somewhat less than this in the Vulpine OpenGL Mark, which is fine (Nvidia driver 31.23). 3. But, puzzlingly with pymol and on-screen rendering of a complex secondary structure sketch (without ray-tracing) I only get a moderate increase (~ 10 %, or so) of the movie frame rate compared to a Geforce2MX440 running on a Pentium III (450 MHz) in my office! Here, I would really expect a huge difference in frame rate. I also don't understand this. A possible explanation would be that pymol, upon automatic detection of the graphics card, internally changes the complexity of the calculations resulting in a 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?
