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From: Georg Bauhaus <rm-host.bauhaus@maps.arcor.de>
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Subject: Re: Ada and OpenMP
References: <87k3pjht79.fsf@ludovic-brenta.org>
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Date: 07 Mar 2013 23:43:47 GMT
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Date: 2013-03-08T00:43:47+01:00
List-Id: <comp.lang.ada>

"Peter C. Chapin" <PChapin@vtc.vsc.edu> wrote:
> OpenMP is a different animal than Ada tasks. It provides fine grained
> parallelism where, for example, it is possible to have the compiler
> automatically parallelize a loop. In C:
> 
> #pragma omp parallel for
> for( i = 0; i < MAX; ++i ) {
>   array[i]++;
> }

Fortunately, OpenMP is no longer needed to achieve automatic
parallelism in either C or Ada at the low level. GCC's vectorizer
produces code that runs in parallel for a number of loop patterns.
These are documented, and they work in GNAT GPL or more
recent FSF GNATs. Later 4.7s IIRC.

The higher level constructs added to OpenMP 3 do have a lot
in common with Ada tasking, if I have understood some
slides correctly. How could it be otherwise?