[Bf-committers] Cycles CUDA Toolkit 8 transition

Thu Aug 4 16:28:56 CEST 2016

Hi.

Nice work!
It became very fast.
It became faster than former revision for around 30 seconds.
Rendering is done now in 1m30s.
Thank you.

With best regards, PerfectionCat

----- Original Message -----
>From: Sergey Sharybin <sergey.vfx at gmail.com>
>To: 
>Cc: bf-blender developers <bf-committers at blender.org>
>Date: 2016/8/4, Thu 01:21
>Subject: Re: [Bf-committers] Cycles CUDA Toolkit 8 transition
> 
>Hi,
>
>There are now updated builds on the buildbot. Please give them a try.
>
>On Wed, Aug 3, 2016 at 4:58 PM, PerfectionCat <sindra1961reborn at yahoo.co.jp>
>wrote:
>
>> 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
>> >>>
>> >>>
>> >>>
>> >>_______________________________________________
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>> >>Bf-committers at blender.org
>> >>https://lists.blender.org/mailman/listinfo/bf-committers
>> >>
>> >
>> >
>> >
>> >--
>> >
>> >With best regards, Sergey Sharybin
>> >
>> >
>> _______________________________________________
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>>
>>
>>
>
>
>-- 
>With best regards, Sergey Sharybin
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