[Bf-cycles] CUDA performance tests

Wolfgang Fähnle wfaehnle at freenet.de
Tue May 20 07:59:54 CEST 2014


Hi, after revert async CUDA changes I made a few tests:
Opensuse 13.1 /64
Toolkit 6.0 (for own builds)
Driver 331.67

Cheers, mib.




Am 17.05.2014, 19:08 Uhr, schrieb David Black <db4tech at yahoo.co.uk>:

> Hi Brecht,
>
> Spent the afternoon carrying out performance tests on a heavy scene  
> (lots of displacement and hair), sorry >scene is test work for a company  
> so unable to share.
>
> GPGPU tests performed with an 2GB GTX 580m
>
> Small border region render of whole scene (F12 final render)
> Blender 2.70a
> Time:02:13 Mem:1540
>
> Blender 2.70.4 (and .5)
> Time:10:53 Mem:1743
> In case there are several accumulating factors involved (other than  
> __launch_bounds__ ), after testing >many Blender versions managed to  
> narrow down dates, big slowdown and increased memory usage was  
> introduced >between 17th and 27th April.
>
> Also, post slowdown, render preview does not begin until the 12th  
> sample, thought the render and/or >Blender had frozen? Synchronizing  
> objects and BVH build time is also slightly slower.
>
> Would you like me to open a bug report?
>
> Hope above information is in some way helpful.
>
> David
>
>
> 3d-designs-davidblack.blogspot.com
> On 25/04/2014 16:44, Brecht Van Lommel wrote:
>> Hi all,
>>
>> We're having some trouble with CUDA performance at the moment, with in
>> a performance regression on Titan cards compared to 2.69, and unclear
>> effects from recent changes. Further there's the new CUDA 6.0 toolkit,
>> which we ideally could move to, as sticking to 5.0 is a problem with
>> newer compilers.
>>
>> We could use some help testing all this, especially for Titan cards as
>> I don't have one of those.
>>
>>
>> There's a google doc here:
>> https://docs.google.com/spreadsheets/d/1IKvO6s7h_0oVGbGE3giowx2fBvyXzIfdM3qCSfROJfI
>>
>> For now I'm assuming someone with a Titan card can make own builds to
>> test these git revisions. If not we can build and upload binaries to
>> test.
>>
>> The test is:
>> * download: http://www.pasteall.org/blend/28679
>> * run: ./blender -b modified_bmw.blend -f 1
>>
>> If you've got a different .blend file that is giving performance
>> regressions, or you find different behavior when rendering in the UI
>> rather than command line, then results from that are welcome too.
>>
>>
>> The information that I'm looking for from this is especially:
>> * Which revision caused the Titan performance regressions?
>> * Is CUDA 6.0 performance acceptable to us for the next release?
>> * Were there significant performance regressions due to recent changes?
>> * Which effect do the two provided patches have when building with CUDA  
>> 6.0?
>>
>> Thanks,
>> Brecht.
>> _______________________________________________
>> Bf-cycles mailing list
>> Bf-cycles at blender.org
>> http://lists.blender.org/mailman/listinfo/bf-cycles
>>
>



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