[Bf-committers] Cycles CUDA Toolkit 8 transition

[PerfectionCat]

I'm sorry.
I got a wrong hash number.
I have not yet tried SHA-1-70100b4ec7ba299912bf999f15914c0a29125ffd.

With best regards, PerfectionCat.


----- Original Message -----
>From: PerfectionCat <sindra1961reborn at yahoo.co.jp>
>To: Sergey Sharybin <sergey.vfx at gmail.com>; bf-blender developers <bf-committers at blender.org> 
>Date: 2016/8/3, Wed 23:28
>Subject: Re: [Bf-committers] Cycles CUDA Toolkit 8 transition
> 
>Hi.
>
>I built in SHA-1: 6353ecb996898b4ce2fe8065130ed1f5ea3b6989 and tried it.
>The build did not become slow.
>However, blender which built in SHA-1: 70100b4ec7ba299912bf999f15914c0a29125ffd is slow.
>
>
>With best regards, PerfectionCat.
>
>
>----- Original Message -----
>>From: Sergey Sharybin <sergey.vfx at gmail.com>
>>To: PerfectionCat <sindra1961reborn at yahoo.co.jp>; bf-blender developers <bf-committers at blender.org> 
>>Date: 2016/8/3, Wed 17:09
>>Subject: Re: [Bf-committers] Cycles CUDA Toolkit 8 transition
>> 
>>
>>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 <sindra1961reborn at 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.vfx at gmail.com>
>>>>To: Blender Developers <bf-committers at 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.vfx at 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 at blender.org
>>>>https://lists.blender.org/mailman/listinfo/bf-committers
>>>>
>>>>
>>>>
>>>_______________________________________________
>>>Bf-committers mailing list
>>>Bf-committers at blender.org
>>>https://lists.blender.org/mailman/listinfo/bf-committers
>>>
>>
>>
>>
>>-- 
>>
>>With best regards, Sergey Sharybin
>>
>>
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