[Bf-committers] [Bf-blender-cvs] SVN commit: /data/svn/bf-blender [43736] trunk/blender/intern/cycles: Cycles: disable environment importance sampling code for CUDA cards with

[Miika Hämäläinen]

CUDA 4.1 performance is as bad as RC2 here...

I tested CUDA versions 4.1, 4.1 RC2 and 4.0 on same Blender revision. 
(GPU: GF 560ti):
* v4.1 :    1 min 11 sec
* v4.1 RC2 :    1 min 11 sec
* v4.0 :     21 sec
Performance: 70% slower!

According to "CUDA 4.1 Overview Webinar" video from CUDA website many 
applications got up to 10% better performance and a few applications got 
1-2% lower performance. In case of any performance drop he suggests to 
file a bug report. Now, if Blender really has 70% lower performance that 
is very suspicious.

Could the reason be a deprecated compiler flag that Blender is still 
using? Like from release notes:
"* For target architecture sm_2x, a new compiler component 'cicc' is 
used instead of 'nvopencc'. "


26.1.2012 22:10, Thomas Dinges wrote:
> Downloading that atm... the RC2 of the 4.1 Toolkit was really slower,
> lets see how the final one does!
>
> Am 26.01.2012 21:03, schrieb Antony Riakiotakis:
>> I see the 4.1 toolkit got released today. Anyone else checked how it
>> performs and if it can handle the compilation on this one?
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