[Bf-committers] Cycles CUDA Toolkit 8 transition

[PerfectionCat]

Hi.

I tried SHA-1-70100b4ec7ba299912bf999f15914c0a29125ffd., but this revision is slow, too.

With best regards, PerfectionCat.


----- Original Message -----
>From: PerfectionCat <sindra1961reborn at yahoo.co.jp>
>To: PerfectionCat <sindra1961reborn at yahoo.co.jp>; Sergey Sharybin <sergey.vfx at gmail.com>; bf-blender developers <bf-committers at blender.org>; bf-blender developers <bf-committers at blender.org> 
>Date: 2016/8/3, Wed 23:49
>Subject: Re: [Bf-committers] Cycles CUDA Toolkit 8 transition
> 
>
>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
>>>
>>>
>>_______________________________________________
>>Bf-committers mailing list
>>Bf-committers at blender.org
>>https://lists.blender.org/mailman/listinfo/bf-committers
>>
>>
>>
>
>