POV-Ray : Newsgroups : povray.windows : Unix version on Windows : Re: Unix version on Windows Server Time
17 Sep 2021 05:06:04 EDT (-0400)
  Re: Unix version on Windows  
From: William F Pokorny
Date: 13 Jun 2017 08:33:20
Message: <593fdb90$1@news.povray.org>
On 06/13/2017 03:07 AM, dick balaska wrote:
> Am 2017-05-18 12:26, also sprach clipka:
>>
>> Performance seems to be just as good as the native Windows binaries --
>> as a matter of fact, on my machine the Unix variant of beta.7 (compiled
>> with g++ 5.4.0) comes out slightly ahead by about 1%.
> 
> I have one thing I've been wanting to write up...
> In the kitchen of my animation, the tile floor is superellipsoids with a 
> box for grout between the tiles.
> When the camera looks at this floor, Windows renders this 10x faster 
> than Linux/gcc [1].  (The grout must be present for the extreme 
> variation.) At least my theory is it's windows vs. Linux.  The problem 
> with my theory is that my Windows box is also my only hyperthreaded i7 
> cpu. My linux boxen are all i5(s).  But I don't think it's the CPU, I 
> think it's the compiler.  Anyway, now I have to write this up as a 
> proper test. I thought it might be interesting to compare against the 
> clang results, too.
> 

We did recently fix a - sometimes significant - 'compiler' related 
degrade with AA mode 2 (+am2) where the windows compiler was OK, but gnu 
g++ and clang were slow. See: https://github.com/POV-Ray/povray/pull/270 
merged April 12, 2017.

Though we saw nothing like a 10x difference.

Bill P.


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