Hi Dalai, I tested 5.5 on a different system I don't have access to this machine right now, I'll deliver the complete benchmark results tomorrow. I plan to compare on as many different configurations with 32 and 64 bit and different cuda versions.
This will take some time but I think it's worth it. ;) /Jürgen Am 03.06.2013 um 20:50 schrieb Dalai Felinto <[email protected]>: > Hi Jurgen, > > How does this times compare between CUDA 5.0 and 5.5? > (is this a speedup from 5.5 but a slowdown in relation with 5.0? or > it's an overall speed up ?) > > -- > Dalai > > 2013/6/3 Jürgen Herrmann <[email protected]>: >> Hi there, >> >> >> >> I did some tests with cuda 5.0 and 5.5 today and changed the nvcc >> optimization flags for cycles_kernel_cuda. >> >> >> >> I found out the following: >> >> >> >> - “--opencc-options “ is deprecated for sm_20 and up and should be >> removed from compiler options >> >> - Stating “-O3” and “—use_fast_math” as nvcc options brings massive >> speedup on my system (more below) >> >> - We shouldn’t complain about new cuda toolsets that are slow, we >> should find a solution as we can’t use old software forever… >> >> >> >> To the speedups: >> >> >> >> Example 1: >> >> system: i7-3820 @ 3.60GHz, GeForce GTK 660 >> >> >> >> Blender (cycles_cuda_kernel) compiled with standard settings: >> >> Mike_pan file took 02:06.60 to render >> >> >> >> Blender (cycles_cuda_kernel) compiled with –O3 –use-fast-math: >> >> Mike_pan took 01:39:93 >> >> >> >> There is no optical difference in the render results: >> >> >> >> Image1: http://www.pasteall.org/pic/52757 >> >> Image2: http://www.pasteall.org/pic/52758 >> >> >> >> I bet there’s more potential in there. >> >> >> >> /Jürgen >> >> _______________________________________________ >> Bf-committers mailing list >> [email protected] >> http://lists.blender.org/mailman/listinfo/bf-committers > _______________________________________________ > Bf-committers mailing list > [email protected] > http://lists.blender.org/mailman/listinfo/bf-committers _______________________________________________ Bf-committers mailing list [email protected] http://lists.blender.org/mailman/listinfo/bf-committers
