[Bf-committers] MinGW support

[Yousef Harfoush]

 >40sec for sync sounds too much
yeah, it seems there is something different with the GPU render between vc12 buildbot and locally compiled! which is another issue i hope to be fixed.

Geforce 970 GPU:
0 min 34 sec  2.76b mingw
0 min 36 sec  2.76b vc12 official
0 min 59 sec  2.76b vc12 self compiled - default config. cuda kernels copied from official 276.b => 40% increase of render time
!  min !!   sec "017c45b" vc12 self compiled with default config. cmake => takes

Intel i5 2500 CPU: and still there is a good difference between them on the CPU.
3 min 21 sec 2.67b mingw
3 min 56 sec 2.67b official => that's 35 sec more time each frame

with latest git
3 min 13 sec 017c45b mingw
!!!!!!!!!!!!!!!  017c45b msvc12  =>  took more than 2 min! for a tile so i stopped the rendering.


Regards
Yousef Harfoush
bat3a at msn.com



> Date: Sat, 23 Jan 2016 17:27:48 +0500
> From: sergey.vfx at gmail.com
> To: bf-committers at blender.org
> Subject: Re: [Bf-committers] MinGW support
> 
> Did you compare speed of builds from builder.blender.org?
> 
> In my tests it takes only about 3sec until first tile appears during
> rendering with BMW1M-MikePan. 40sec for sync sounds too much,
> 
> On Tue, Dec 29, 2015 at 3:57 PM, Cezary Kopias <cezary.kopias at gmail.com>
> wrote:
> 
> > http://www.pasteall.org/pic/96989
> >
> > On 28 December 2015 at 06:19, Yousef Harfoush <bat3a at msn.com> wrote:
> >
> > > HI
> > > here is 2 builds with the default config except no player, ge, osl,
> > > opensubdiv, collada:
> > > cmake+vc12       => 01:48
> > > https://www.dropbox.com/s/03unj4x8xz3zp97/cmak%2Bvc12.7z?dl=0
> > > cmake+mingw   => 01:08
> > > https://www.dropbox.com/s/pbyyl1mpttkamwf/cmake%2Bmingw.7z?dl=0
> > >
> > > The render speed differs greatly between vc12 and mingw, using
> > > BMW1M-MikePan scene with nvidia geforce 660
> > >
> > > 40 second spent on sync and bvh in vc12! which would kill animation
> > > rendering times.
> > >
> > >
> > >
> > >
> > > Regards
> > > Yousef Harfoush
> > > bat3a at msn.com
> > >
> > >
> > >
> > > > Date: Sun, 27 Dec 2015 10:14:47 +0000
> > > > From: blender at dingto.org
> > > > To: bf-committers at blender.org
> > > > Subject: Re: [Bf-committers] MinGW support
> > > >
> > > > Can you back that value up?
> > > >
> > > > When we were still using MSVC 2008, the difference to gcc/clang was
> > > > indeed quite large.
> > > > But since we switched to MSVC 2013, I highly doubt it's more than
> > 5-10%.
> > > >
> > > >
> > > > Zitat von Yousef Harfoush <bat3a at msn.com>:
> > > >
> > > > > but is it not worth 40% render time reduction to support mingw, i
> > > > > mean that's is like 2 years of optimizing cycles, isn't it, i think
> > > > > it's better to drop vc12 in favor of mingw.
> > > > >
> > > >
> > > >
> > > > _______________________________________________
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> 
> 
> 
> -- 
> With best regards, Sergey Sharybin
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