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Newsgroups: comp.lang.ada
Date: Tue, 19 Jun 2018 18:41:58 -0700 (PDT)
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Subject: Re: Ada lacks lighterweight-than-task parallelism
From: "Dan'l Miller" <optikos@verizon.net>
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Xref: reader02.eternal-september.org comp.lang.ada:53186
Date: 2018-06-19T18:41:58-07:00
List-Id: <comp.lang.ada>

On Tuesday, June 19, 2018 at 8:12:02 PM UTC-5, Shark8 wrote:
> On Tuesday, June 19, 2018 at 4:14:17 PM UTC-6, Dan'l Miller wrote:
> > 
> > Ada for the Cold War in 1983 would focus on tasks as the only vehicle for parallelism.  Ada for the 21st century would also embrace/facilitate slices somehow, via some sort of locality of reference or via some sort of demarcation of independence.
> 
> Don't hate on TASK!
> TASK is a great construct, and particularly good for:
> 1) Isolating and/or interfacing both subsystems and jobs, with the possibility of taking advantage of multiprocessor capability;
> 2) Implementing protocols, via the ACCEPT construct; and
> 3) at a high-level rather than the "annotated GPU assembly" we get with (eg) CUDA/C.

I'm not saying anything negative about tasks.  I am just saying that there should be more games to play in the casino than merely one and only one.

> As for something lightweight, we're working on that in the ARG right now:
> * PARALLEL DO blocks,
> * Parallel LOOPs [IIRC, it might be just FOR], and
> * And some other things like operators, blocking-detection, etc.

Excellent!  These should produce slices for numeric computations.  I am not as sure that they alone(!) will necessarily produce usable slices regarding non-numeric arbitrary processing via deep call-trees of subprograms.