Thanks, DRC! This seems to be the exact cause. We have now solved the problem by working around it in our application, so no rush on the pre-release build. Thanks again.
Regards, David Björkevik On 2011-01-31 18:24, DRC wrote: > I think this is the same issue that another user reported and which has > been fixed in the VirtualGL CVS head. When an application has set the > render mode to GL_SELECT and calls glFlush() while doing front buffer > rendering, this causes very slow glReadPixels() performance on nVidia > hardware. The fix was to detect whether GL_SELECT is enabled whenever > the VirtualGL readback function is called and, if so, to temporarily > disable it before performing the readback. > > Unfortunately, SourceForge has still not re-enabled their CVS server in > the wake of last week's security attack, so I cannot access the > VirtualGL code right now. If I could, I would spin a pre-release build > for you to try out. > > > On 1/31/11 8:52 AM, David Björkevik wrote: >> Dear List >> >> I have an installation of VirtualGL using Cendio Thinlinc on an 8 core >> machine with Nvidia Quadro graphics. >> >> Performance is excellent except when our application uses "picking" to >> detect what part of the OpenGL scene the user is clicking at. >> >> After picking, the program hangs for about a second with no regard to >> the size of the model itself. When halting with GDB, the backtrace shows >> the >> >> I tried the VGL_PROFILE option. Standard values for Readback are in the >> 300-600 Mpixels/sec range. However, when picking, this drops to <1 >> Mpixels/sec. >> >> Any pointers or ideas? >> >> Thanks! >> >> /David >> >> >> >> >> ------------------------------------------------------------------------------ >> Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! >> Finally, a world-class log management solution at an even better price-free! >> Download using promo code Free_Logger_4_Dev2Dev. Offer expires >> February 28th, so secure your free ArcSight Logger TODAY! >> http://p.sf.net/sfu/arcsight-sfd2d >> >> >> >> _______________________________________________ >> VirtualGL-Users mailing list >> VirtualGL-Users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/virtualgl-users > > ------------------------------------------------------------------------------ > Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! > Finally, a world-class log management solution at an even better price-free! > Download using promo code Free_Logger_4_Dev2Dev. Offer expires > February 28th, so secure your free ArcSight Logger TODAY! > http://p.sf.net/sfu/arcsight-sfd2d > _______________________________________________ > VirtualGL-Users mailing list > VirtualGL-Users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/virtualgl-users -- David Björkevik, Engineer Full contact information: http://people.erab.se/david Engineering Research Nordic AB - http://www.erab.se/ Voice: +46 (0)13-23 66 80
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