[geos-devel] Optimization

[Amanda Osvaldo]

Thanks very much Steve, I will think more about high-performance open
source software.Because it's true, not all software are optimized and
not all communities have the resources for that, however some projects
require high-performance softwares.

-- Amanda Osvaldo

On Tue, 2017-05-02 at 21:48 -0400, Stephen Woodbridge wrote:
> I can't speak for the developers, but I think it is highly unlikely
> that 
> they would do anything along these lines if it is not compatible
> across 
> multiple architectures. There are lots of high performance
> CPUs/GPUs/etc 
> out there each with their own special requirements. Who is going to
> fund 
> development, ongoing support, debugging and bug fixing. And you have
> to 
> have systems with these chips in them to support that. It is costly
> and 
> time consuming to do this for even one of them. This also puts
> multiple 
> different execution paths in the code that makes it harder to
> maintain.
> 
> I think the community would rather the developers make really good, 
> portable, well tested code that works on all platforms, and it
> release 
> in regular stable way with new geospatial features rather than focus
> on 
> support one platform in some specialized way instead of doing new 
> feature development.
> 
> My 2 cents anyway.
>    -Steve
> 
> On 5/2/2017 5:51 PM, Amanda Osvaldo wrote:
> > Hi Steve, more than the compiler it is necessary for the data to
> > fit 
> > into the processor correctly.
> > 
> > And more, I don't have found GPU code yet.
> > I don't know if it's will take some advantage, however for a large
> > scale 
> > processing it should be necessary.
> > 
> > *Tell me, I not confounding the things?*
> > 
> > I see Geos has a geometry engine, however, it doesn't mean that
> > it's a 
> > high-performance engine or designed for massive computation.
> > 
> > -- Amanda Osvaldo
> > 
> > On Tue, 2017-05-02 at 14:02 -0400, Stephen Woodbridge wrote:
> > > On 5/2/2017 1:53 PM, Amanda Osvaldo wrote:
> > > > Hi everybody. I'm reading the Geos source code and have no
> > > > found any 
> > > > low-level optimization, like the use AVX2 instruction set for
> > > > Intel 
> > > > processors. It's an important question because without these
> > > > and 
> > > > others optimization I have no significant difference between a
> > > > Intel 
> > > > Core and Intel Xeon processors. Can someone tell me if the lack
> > > > of 
> > > > optimization is intentional or just a lack of programmers? --
> > > > Amanda 
> > > > Osvaldo 
> > > 
> > > 
> > > Amanda,
> > > 
> > > I would think that this is the responsibility of the compiler,
> > > not the
> > > application. I believe you can get an Intel compiler that is
> > > designed to
> > > optimize for these various HW differences.
> > > 
> > > https://software.intel.com/en-us/blogs/2013/01/03/free-intel-c-co
> > > mpilers-for-students-and-related-parallel-programming-tools
> > > 
> > > -Steve W
> > > 
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