Neat trick. :) I don't think that the issue you're seeing has anything to do with VGL per se. I think it's how your X server is configured. $gpu in your examples below refers to an X screen number. Typically, in a VirtualGL multi-GPU environment, one would configure the X server such that each GPU occupies a separate X screen (0.0, 0.1, 0.2, etc.) Then you can address a specific GPU by setting VGL_DISPLAY to :0.0, :0.1, etc. Others, however, prefer to run a completely new X server instance on each GPU, in which case they would be addressed as :0.0, :1.0, etc. In your case, I think one of your X servers is configured differently than the other, which is why the screen numbers are different.
Ultimately, I don't think it's going to be valid to assume that the DISPLAY-to-GPU mapping is constant, so perhaps the best approach would be to introduce either a new environment variable (VGL_GPUS, for instance) or a config file that defines a list of X display to GPU mappings. If this environment variable/config setting is defined, then vglrun could assume that you want to use load balancing, and it could call nvidia-smi (or an equivalent on ATI, if such exists) to find the least-loaded GPU. I would be interested in integrating this into the project. On 9/18/13 3:13 PM, Rafael Guimaraes wrote: > Hi folks, > > I have built a script that checks which GPU is currently being less used > (through nvidia-smi) and calls vglrun with this information so that my > processes are balanced among the available GPUs. > > The problem is that I use the same script in two different machines > (both with 4 GPUs) and they map the GPUs differently. In the first > computer, I can run vlgrun -d :0.$gpu , where $gpu may vary from 1 to 4 > (equivalent to GPU 0 to 3 as reported by nvidia-smi). However, in the > second computer, $gpu may vary from 0 to 3 (equivalent to GPU 0 to 3 as > reported by nvidia-smi). > > Is there a way to address GPUs by vglrun in the same way in both > computers? If not, is there a way for my script to find if vglrun > addresses GPUs from 0 to 3 or from 1 to 4? > > Thanks in advance! > > Cheers, > > Rafael Guimarães ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/20/13. http://pubads.g.doubleclick.net/gampad/clk?id=58041151&iu=/4140/ostg.clktrk _______________________________________________ VirtualGL-Users mailing list VirtualGL-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtualgl-users
