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Newsgroups: comp.lang.ada
Date: Sat, 7 Apr 2018 09:57:34 -0700 (PDT)
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Subject: Re: Large number of tasks slows down my program (using debian) - any
 fix?
From: Brad Moore <bmoore.ada@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:51385
Date: 2018-04-07T09:57:34-07:00
List-Id: <comp.lang.ada>

On Saturday, April 7, 2018 at 6:21:22 AM UTC-6, Simon Wright wrote:
> Brad Moore <bmoore.ada@gmail.com> writes:
>=20
> > Another data point is the entry I submitted to the Computer Language
> > Benchmark Games site for the Thread-Ring benchmark.
>=20
> It doesn't do so well on a Macbook Pro (2.9 GHz Intel Core i5)! it used
> about 147% cpu (i.e. the 2 physical cores) and took 8 minutes.
>=20
> Much the same results with -gnatp -O2 as with the switches reported on
> the website, not that I know whether they'd be appropriate for this
> machine. (I see that the source code comments say "Note that this
> version is compiled with full Ada checks enabled, and optimization
> turned off", which isn't the case as reported).
>=20
> This was with GCC 8.0.1 20180309, which required
> Create_Lightweight_Thread's body to be seen before use.

At one point, I believe the optimisation comment was true, but at some late=
r point I must have sent in an update which changed the compile options, bu=
t missed updating the comment. I should send in a new version with a fix to=
 the elaboration problem, since presumably at some point they will move to =
a newer compiler version that has this check.

Thanks,

Brad