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).
-========================== Tesla M2070Q ==========================- glreadtest GLreadtest v2.3.2 (Build 20121221) glreadtest -h for advanced usage. Rendering to Pbuffer using GLX on display :0.0 FB Config = 0xe5 Drawable size = 701 x 701 pixels Using 1-byte row alignment >>>>>>>>>> PIXEL FORMAT: LUM <<<<<<<<<< glDrawPixels(): 1177 Mpixels/sec glReadPixels(): 0.7823 Mpixels/sec (min = 0.7815, max = 0.7832, sdev = 0.0008359) glReadPixels() accounted for 99.98% of total readback time >>>>>>>>>> PIXEL FORMAT: RED <<<<<<<<<< glDrawPixels(): 426.7 Mpixels/sec glReadPixels(): 558.5 Mpixels/sec (min = 532.3, max = 565.5, sdev = 2.631) glReadPixels() accounted for 99.99% of total readback time >>>>>>>>>> PIXEL FORMAT: BGRA <<<<<<<<<< glDrawPixels(): 429.4 Mpixels/sec glReadPixels(): 688.5 Mpixels/sec (min = 605.3, max = 697.0, sdev = 4.143) glReadPixels() accounted for 99.98% of total readback time >>>>>>>>>> PIXEL FORMAT: ABGR <<<<<<<<<< glDrawPixels(): 429.4 Mpixels/sec glReadPixels(): 684.2 Mpixels/sec (min = 622.1, max = 692.3, sdev = 3.919) glReadPixels() accounted for 99.98% of total readback time >>>>>>>>>> PIXEL FORMAT: BGR <<<<<<<<<< glDrawPixels(): 426.3 Mpixels/sec glReadPixels(): 559.1 Mpixels/sec (min = 533.0, max = 564.8, sdev = 2.294) glReadPixels() accounted for 99.98% of total readback time >>>>>>>>>> PIXEL FORMAT: RGBA <<<<<<<<<< glDrawPixels(): 429.5 Mpixels/sec glReadPixels(): 457.8 Mpixels/sec (min = 438.7, max = 462.3, sdev = 1.327) glReadPixels() accounted for 99.98% of total readback time >>>>>>>>>> PIXEL FORMAT: RGB <<<<<<<<<< glDrawPixels(): 361.3 Mpixels/sec glReadPixels(): 402.9 Mpixels/sec (min = 393.4, max = 404.8, sdev = 0.8224) glReadPixels() accounted for 99.99% of total readback time -========================== Tesla M2070 ==========================- [paulmc@m1028 paulmc]$ glreadtest GLreadtest v2.3.2 (Build 20121221) glreadtest -h for advanced usage. Rendering to Pbuffer using GLX on display :0.0 FB Config = 0xc5 Drawable size = 701 x 701 pixels Using 1-byte row alignment >>>>>>>>>> PIXEL FORMAT: LUM <<<<<<<<<< glDrawPixels(): 1147 Mpixels/sec glReadPixels(): 0.7814 Mpixels/sec (min = 0.7806, max = 0.7822, sdev = 0.0008251) glReadPixels() accounted for 99.99% of total readback time >>>>>>>>>> PIXEL FORMAT: RED <<<<<<<<<< glDrawPixels(): 425.1 Mpixels/sec glReadPixels(): 141.3 Mpixels/sec (min = 139.8, max = 141.9, sdev = 0.3018) glReadPixels() accounted for 100.00% of total readback time >>>>>>>>>> PIXEL FORMAT: BGRA <<<<<<<<<< glDrawPixels(): 427.7 Mpixels/sec glReadPixels(): 174.4 Mpixels/sec (min = 169.7, max = 175.2, sdev = 0.3794) glReadPixels() accounted for 100.00% of total readback time >>>>>>>>>> PIXEL FORMAT: ABGR <<<<<<<<<< glDrawPixels(): 427.7 Mpixels/sec glReadPixels(): 173.9 Mpixels/sec (min = 169.7, max = 174.7, sdev = 0.3563) glReadPixels() accounted for 100.00% of total readback time >>>>>>>>>> PIXEL FORMAT: BGR <<<<<<<<<< glDrawPixels(): 424.6 Mpixels/sec glReadPixels(): 142.0 Mpixels/sec (min = 140.6, max = 142.5, sdev = 0.2527) glReadPixels() accounted for 100.00% of total readback time >>>>>>>>>> PIXEL FORMAT: RGBA <<<<<<<<<< glDrawPixels(): 427.7 Mpixels/sec glReadPixels(): 116.1 Mpixels/sec (min = 115.2, max = 116.4, sdev = 0.1481) glReadPixels() accounted for 100.00% of total readback time >>>>>>>>>> PIXEL FORMAT: RGB <<<<<<<<<< glDrawPixels(): 356.4 Mpixels/sec glReadPixels(): 101.9 Mpixels/sec (min = 101.3, max = 102.1, sdev = 0.08861) glReadPixels() accounted for 100.00% of total readback time Cheers, Paul ----- Original Message ----- > From: "Vadim Peretokin" <vpereto...@gmail.com> > To: "VirtualGL Users" <virtualgl-users@lists.sourceforge.net> > Sent: Sunday, 16 June, 2013 2:19:55 PM > Subject: Re: [VirtualGL-Users] Improving performance on very large displays > > > > Here is the data for a GTX 560 (not Ti), 310.14 drivers, Ubuntu 12.04 > 64bit: http://pastebin.com/raw.php?i=xW8v7UpF > ------------------------------------------------------------------------------ > 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
