Thanks for fast response! As I understand, tiles size only affects performance (+memory usage) and may be preview generation, but does not affect quality of result? So basically, does adjusting of tiles size impact finally rendered image?
2015-04-23 22:39 GMT-07:00 gandalf3 <[email protected]>: > Regarding CPU vs GPU, tile size plays a big role. As a general rule of > thumb, CPUs like smaller tile sizes and GPUs like larger tile sizes. > It varies from GPU to GPU and from scene to scene, but I tend to use a > tile size of about 128 for my gpu. > > On 04/23/15 22:36, Andrey Chursin wrote: >> Hi >> >> I am processing blender file using python script passed in -P cmd argument >> >> I am new to blender so I am not familiar with all bpy >> objects/properties. Can you help me with it? >> >> 1) How can I get current rendering tile and estimated time in cycles >> rendering engine? I know there is render_stats handler, and I even >> found function BlenderSession::get_progress in sources, but I am still >> puzzled how can I get this info from python script. >> 2) How can I get list of cameras available? >> 3) How can I setup active camera for rendering? >> 4) How can I get/set number of samples when rendering? >> >> And some question about GPU performance >> >> I was rendering first frame from classroom from blender demo >> (http://www.blender.org/wp-content/uploads/2015/04/classroom-200x107.png) >> >> I tested it on c4.large AWS virtual machine (2 cores of Intel Xeon >> E5-2666 v3) vs g2.8xlarge GPU vm(4 unspecified nvidia GPUs with 1,536 >> CUDA cores each) >> >> What puzzles me is that 2-core CPU vm renders 2x faster then 4-GPUs machine. >> >> On GPU I was using combined cuda device, and all GPUs was actually >> busy(nvidia-smi shows 99% utilization of all 4 GPUs) >> >> I understand that GPU/CPU are not very comparable, but results are >> still strange. Is there any specific conditions when GPU actually >> works faster then CPU? >> >> > > > -- > -gandalf3 > > _______________________________________________ > Bf-committers mailing list > [email protected] > http://lists.blender.org/mailman/listinfo/bf-committers -- Regards, Andrey _______________________________________________ Bf-committers mailing list [email protected] http://lists.blender.org/mailman/listinfo/bf-committers
