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From: Michael S <already5chosen@yahoo.com>
Newsgroups: comp.lang.c
Subject: Re: filling area by color atack safety
Date: Sun, 31 Mar 2024 10:54:38 +0200
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On Sat, 30 Mar 2024 21:15:06 +0300
Michael S <already5chosen@yahoo.com> wrote:

> On Fri, 29 Mar 2024 23:58:26 -0700
> Tim Rentsch <tr.17687@z991.linuxsc.com> wrote:
> 
> > 
> > One, the new code is a lot more complicated than the previous
> > code.  I'm not sure the performance gain is worth the cost
> > in complexity.  What kind of speed improvements do you see,
> > in terms of percent?
> >  
> 
> On my 11 y.o. and not top-of-the-line even then home PC for 4K
> image (3840 x 2160) with cross-in-cross shape that I took from one of
> your previous post, it is 2.43 times faster.
> I don't remember how it compares on more modern systems. Anyway, right
> now I have no test systems more modern than 3 y.o. Zen3.
> 
> 

I tested on newer hardware - Intel Coffee Lake (Xeon-E 2176G) and AMD
Zen3 (EPYC 7543P).
Here I no longer see significant drop in speed of the 1x1 variant at 4K
size, but I still see that more complicated variant provides nice speed
up. Up to 1.56x on Coffee Lake and up to 3x on Zen3.