Jason Daly wrote: > David Glenn wrote: > > > Hi, Sorry to trouble you on this, but I have to ask someone - to support my > > hypothesis on this issue! > > > > I'm running Red Hat Enterprise 5.1 using a Gforce 8600 card using the > > latest driver from nvidia (119.52). > > > > I know that P4 stuff is old school and Performer is very old school! > > And there is most likely nobody else in the world that is being forced > > to do this but me, however here we go: > > > > Up until a month ago I've been using a system that uses Core Duo system > > (until it cashed) and I was running a program that was running performer > > and basically the same program using OSG. Both where working normally - > > naturally OSG was working better than performer! > > > > Now, I'm running a P4 system (only deference is the CPU and double the > > memory) and the OSG using the same graphics card and the OSG version of my > > project is running happy but the version running Performer has slowed to a > > crawl when they run together. > > > > I ran top and found that OSG is taking up most of the CPU time making me > > think that OSG runs better on the Core Duo than the P4. My understanding > > from someone is that the P4 is not exactly a twin core but a single core > > using threading to behave as a two core system and the Core Duo is a true > > twin core system, hence OSG behaves better using the Core Duo! > > > > One idea that was brought up to me was to move up to a Quadro graphic card. > > Someone at PNY told me that it's the only card that works best under Linux > > for OGL. > > > > I know I'm going to get the Why are you doing this reaction, but that is > > the requirements! The user will be able to run Performer and OSG at the > > same time! The best answer I can come up with is "use Core Duo or better" > > but that means dumping 64 boxes! > > > > > > > I'd make sure both the OSG and Performer apps are running > single-threaded/single process (PFMP_APPCULLDRAW). > > You can set the environment variable OSG_THREADING to "SingleThreaded" > to handle the OSG app. I couldn't find an equivalent for Performer, so > you might have to edit the code and change/add the call to > pfMultiprocess(PFMP_APPCULLDRAW). > > Also, I remember having issues with an Nvidia driver running multiple > contexts before. What happens on that machine if you just run two > copies of either program (or two copies of glxgears, for that matter). > You can try turning off Vsync (set the __GL_SYNC_TO_VBLANK environment > variable to 0), as I remember this helping to work around it. > > I don't think getting a Quadro will help you with this problem (that's > just PNY trying to sell you more expensive cards). NVIDIA's Linux > support is way better than anyone else's, for both GeForce and Quadro. > > --"J" > > _______________________________________________ > osg-users mailing list > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > ------------------ > Post generated by Mail2Forum
Yes, I have the OSG program set to single thread. I've even tried cutting back on OSG's cycle time - that only had the effect of degrading the OSG cycle time. I may be quick to judge but I agree that the Core Duo is just a better processor than the P4 - I have used a Core Duo for over two years on some systems at home! Besides, I never promised these guys that OSG and Performer would ever work in concert with each other. I guess, it was just a happy accident that it worked on the Core Duo! I'll give the settings a try, but I think that I'm trying to race a Ferrari with a Volkswagen. As for the card! I had that feeling also, even though I was willing to run an experiment on one to try it out. According to an Engineer at Nvidia I met at Siggraph that if I was ever serous about doing OpenGL on Linux that I had to go Quadro! Yep! I thought it was a cheep sales pitch also! I'll keep you informed, but I don't expect much improvement in results! D Glenn ------------------------ D Glenn (a.k.a David Glenn) - Join the Navy and See the World ... from your Desk! ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=24296#24296 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
