Interesting. Can you test revision 6353ecb and the one prior to it to see if it's this revision caused the problem?
On Wed, Aug 3, 2016 at 12:27 AM, PerfectionCat <sindra1961reb...@yahoo.co.jp > wrote: > Hi. > > blender which built using a source file at the time of 467e12514e60 in > CUDA8 has a shorter time required for rendering of BMW for around 20 > seconds. > > SHA-1-2f5db2e45b7a8af51b15c45bb41f5dcb49ae9d4d is slow. > SHA-1-467e12514e60b4130cd0a33b59f53aa4cf7056b6 is fast. > > Windows 10 pro 64bits > > Intel i7 6700K 4.4GHz > NVIDIA GTX 1070 > MEMORY 16GB > > > With best regards, PerfectionCat. > > > > ----- Original Message ----- > >From: Sergey Sharybin <sergey....@gmail.com> > >To: Blender Developers <bf-committers@blender.org> > >Date: 2016/8/2, Tue 23:44 > >Subject: Re: [Bf-committers] Cycles CUDA Toolkit 8 transition > > > >Hey again, > > > >Spent majority of the day trying to solve the regression, without much > >success. Even simplest kernel needed for BMW scene is about 10% slower. > >This is mainly coming from bump nodes. Enabling all other features makes > >things even worse performance wise. > > > >I did some tweaks again to make sure all functions are inlined in the same > >manner by CUDA 8.0 as they used to be before. So now PTax output shows > >exactly same function, but for some reason spills are just higher with new > >toolkit and at the same time stack usage is reasonably slower. Not sure > yet > >what's going on here and think we'd better leave this alone for until > >official toolkit is released. > > > >For the time being i've switched buildbots to use more complicated setup, > >using CUDA 7.5 for all kernels except sm_60 and sm_61 (new generation > >cards) and using new toolkit only for new kernels. > > > >So hopefully now all maxwell and lower crads have same performance as > >before. And yet users of new cards can have some degree of GPU rendering. > > > > > >On Mon, Aug 1, 2016 at 6:15 PM, Sergey Sharybin <sergey....@gmail.com> > >wrote: > > > >> Hey everyone, > >> > >> In order to make Cycles officially support new Pascal cards (GTX 10x0) > it > >> is crucial to use CUDA Toolkit 8. While it is still in the RC stage we > >> started looking into making it official one for Cycles. > >> > >> There is already some initial work done: > >> > >> - Tweaks are done to Cycles kernel to have same level of inlined > functions > >> (new toolkit barely used inlined functions, which resulted in poor > >> performance on all cards) > >> - New toolkit was installed onto all release environments and buildbots. > >> > >> So on a positive side, next buildbot's builds will support Pascal cards, > >> yay! :) > >> > >> But unfortunately, while i've managed to keep Kepler cards (GTX760) same > >> performance as before, we had a report from Jens in IRC about Maxwell > cards > >> having a poor performance yet again (in his case, up to 40% worse). > >> > >> This is really unacceptable, we'll keep working on solution for this > >> issue. It might take some time, so just be aware and please be patient > :) > >> > >> I will keep posted here with our progress. > >> > >> -- > >> With best regards, Sergey Sharybin > >> > > > > > > > >-- > >With best regards, Sergey Sharybin > >_______________________________________________ > >Bf-committers mailing list > >Bf-committers@blender.org > >https://lists.blender.org/mailman/listinfo/bf-committers > > > > > > > _______________________________________________ > Bf-committers mailing list > Bf-committers@blender.org > https://lists.blender.org/mailman/listinfo/bf-committers > -- With best regards, Sergey Sharybin _______________________________________________ Bf-committers mailing list Bf-committers@blender.org https://lists.blender.org/mailman/listinfo/bf-committers