On 2011-01-31 17:06, Nathan Kidd wrote: > On 11-01-31 09:52 AM, David Björkevik wrote: >> 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? > > VGL_TRACE might give some clues if you could identify which calls were > stalling, but I think timestamps would need to be added for that.
Thanks, VGL_TRACE was interesting. Here's a snippet: [VGL] glViewport (x=0 y=0 width=998 height=710 ) 0.025988 ms [VGL] glDrawBuffer (mode=0x00000405 pbw->_dirty=1 pbw->_rdirty=0 pbw->getdrawable()=0x00400003 ) 0.019073 ms [VGL] glFlush() [VGL] _doGLreadback (pbw->getdrawable()=0x00400003 sync=0 spoillast=1 ) 922.807932 ms [VGL] glFinish() [VGL] glDrawBuffer (mode=0x00000405 pbw->_dirty=0 pbw->_rdirty=0 pbw->getdrawable()=0x00400003 ) 0.006914 ms [VGL] glViewport (x=0 y=0 width=119 height=85 ) 0.028133 ms Almost a second for _doGLreadback... that's not so good. /David -- 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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