Hi, I have installed nvidia OpenGL drivers on amazon gpu cluster instance which has two Tesla M2050 GPUs and I see a weird behavior when I run any two apps in quick succession. I am running the server in a headless mode with xorg.conf generated using the following options: sudo nvidia-xconfig -a --no-xinerama --no-dynamic-twinview --use-display-device=None --virtual=1280x1024 which maps two screens each of them to two devices. Finally I run X Server using: sudo /usr/bin/X :0 and then I run any application on any one of the GPUs using: #Runs it on first GPU export DISPLAY=:0.0 glxgears #Runs it on second GPU export DISPLAY=:0.1 glxgears I noticed that sometimes it takes a very very long time (~couple of seconds to a minute) before a call to XOpenDisplay succeeds. It is not clear if the issue is with X server or with nvidia drivers or possibly with my xorg settings. I notice that when an application exits the output is similar to the following output (see below below this paragraph) on the terminal where I started the X. Only when this is dumped when the previous application exits / closes the display, the XOpenDisplay succeeds. So it seems that only after either the driver of X does some cleanup the subsequent XOpenDisplay succeeds. 12 XSELINUXs still allocated at reset SCREEN: 0 objects of 344 bytes = 0 total bytes 0 private allocs COLORMAP: 0 objects of 8 bytes = 0 total bytes 0 private allocs DEVICE: 0 objects of 104 bytes = 0 total bytes 0 private allocs CLIENT: 0 objects of 152 bytes = 0 total bytes 0 private allocs WINDOW: 0 objects of 72 bytes = 0 total bytes 0 private allocs PIXMAP: 4 objects of 112 bytes = 448 total bytes 0 private allocs ... ... TOTAL: 8 objects, 320 bytes, 0 allocs Is there someone who could help? Regards, Divick _______________________________________________ xorg@xxxxxxxxxxx: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: list-xorg@xxxxxxxxxxx