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Newsgroups: comp.lang.ada
Date: Fri, 13 Oct 2017 15:55:26 -0700 (PDT)
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Subject: Re: How many CPU cores?
From: Kevin K <kevink4@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:48442
Date: 2017-10-13T15:55:26-07:00
List-Id: <comp.lang.ada>

On Monday, October 2, 2017 at 5:07:36 PM UTC-5, Victor Porton wrote:
> "make" in GNAT GPS supports "Multiprocessing".
>=20
> How much processes should I use with my 4 cores i7 processor?
>=20
> There are two threads per code due hyperthreading. So should I use 4*2=3D=
8=20
> "Multiprocessing" setting to compile quickly?
>=20
> --=20
> Victor Porton - http://portonvictor.org

Assuming sufficient memory, you will probably hit limits on disk access bef=
ore cpu limits.  So 8 is probably safe.  If not enough disk throughput avai=
lable, there will still be unused CPU cycles, and adding more threads proba=
bly won't help.   It depends too on how large of system you are compiling. =
 Individual packages are single threaded compiles, so more cores help only =
if there are more packages that need to be compiled.  And if in a test/modi=
fy/build cycle, there probably won't be much advantage except when changing=
 specs.