A bit better... [paulmc@m1029 paulmc]$ glreadtest -pbo
GLreadtest v2.3.2 (Build 20121221) Rendering to Pbuffer using GLX on display :1.0 Using PBO's for readback Xlib: extension "GLX" missing on display ":1.0". Xlib: extension "GLX" missing on display ":1.0". 256: Could not obtain Visual [paulmc@m1029 paulmc]$ export DISPLAY=:0 [paulmc@m1029 paulmc]$ glreadtest -pbo GLreadtest v2.3.2 (Build 20121221) Rendering to Pbuffer using GLX on display :0.0 Using PBO's for readback FB Config = 0xc5 Drawable size = 701 x 701 pixels Using 1-byte row alignment >>>>>>>>>> PIXEL FORMAT: LUM <<<<<<<<<< glDrawPixels(): 1160 Mpixels/sec glReadPixels(): 0.7835 Mpixels/sec (min = 0.7821, max = 0.7848, sdev = 0.00135 2) glReadPixels() accounted for 99.97% of total readback time >>>>>>>>>> PIXEL FORMAT: RED <<<<<<<<<< glDrawPixels(): 425.3 Mpixels/sec glReadPixels(): 443.9 Mpixels/sec (min = 184.9, max = 447.6, sdev = 8.973) glReadPixels() accounted for 2.117% of total readback time >>>>>>>>>> PIXEL FORMAT: BGRA <<<<<<<<<< glDrawPixels(): 427.9 Mpixels/sec glReadPixels(): 226.6 Mpixels/sec (min = 166.2, max = 227.5, sdev = 2.838) glReadPixels() accounted for 1.050% of total readback time >>>>>>>>>> PIXEL FORMAT: ABGR <<<<<<<<<< glDrawPixels(): 427.8 Mpixels/sec glReadPixels(): 226.4 Mpixels/sec (min = 168.5, max = 227.5, sdev = 2.799) glReadPixels() accounted for 1.176% of total readback time >>>>>>>>>> PIXEL FORMAT: BGR <<<<<<<<<< glDrawPixels(): 424.9 Mpixels/sec glReadPixels(): 267.3 Mpixels/sec (min = 197.2, max = 268.1, sdev = 3.026) glReadPixels() accounted for 1.288% of total readback time >>>>>>>>>> PIXEL FORMAT: RGBA <<<<<<<<<< glDrawPixels(): 427.7 Mpixels/sec glReadPixels(): 226.7 Mpixels/sec (min = 169.7, max = 227.4, sdev = 2.671) glReadPixels() accounted for 1.042% of total readback time >>>>>>>>>> PIXEL FORMAT: RGB <<<<<<<<<< glDrawPixels(): 359.3 Mpixels/sec glReadPixels(): 267.2 Mpixels/sec (min = 199.1, max = 268.2, sdev = 2.971) glReadPixels() accounted for 1.285% of total readback time Paul ----- Original Message ----- > From: "DRC" <dcomman...@users.sourceforge.net> > To: virtualgl-users@lists.sourceforge.net > Sent: Monday, 17 June, 2013 5:43:52 PM > Subject: Re: [VirtualGL-Users] Improving performance on very large displays > > Does enabling PBOs make any difference? > > > On 6/17/13 2:02 AM, Arthur HUILLET wrote: > > On Mon, Jun 17, 2013 at 11:30:34AM +1000, Paul McIntosh wrote: > >> Ok - here is the data for a Tesla M2070 and M2070Q (Quadro) > >> > >> There is a big difference between the Quadro and non-Quadro. Looks > >> like the read rate is 1/4 for the non-Quadro. These are virtually > >> same hardware, however I know that the Quadro has some cache size > >> differences for transferring data (so it can't all be blamed on > >> the driver). > > > > Thanks for confirming my remark with actual figures. I do believe > > that it can all be blamed on the driver, and that it was designed > > that way, but that doesn't really matter - non Quadro readback > > performance may very well be too limited for certain use cases; I > > think this is the message to take home. > > > > Out of curiosity, can you elaborate as to the cache size > > differences? Where did you get this information and what > > differences are there exactly? > > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > VirtualGL-Users mailing list > VirtualGL-Users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/virtualgl-users > -- Dr Paul McIntosh Senior HPC Consultant, Technical Lead, Multi-modal Australian ScienceS Imaging and Visualisation Environment (www.massive.org.au) Monash University, Ph: 9902 0439 Mob: 0434 524935 ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ VirtualGL-Users mailing list VirtualGL-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtualgl-users
