Re: [PATCH] src/main.c: Add -J to detect number of job slots based on nproc.

[Eli Zaretskii]

> Date: Fri, 12 Apr 2024 07:58:28 +0200
> From: Henrik Carlqvist <hc94@poolhem.se>
> Cc: bug-make@gnu.org, matt.stav.taylor@gmail.com
> 
> On Fri, 12 Apr 2024 02:13:36 +0100
> Matt Staveley-Taylor <matt.stav.taylor@gmail.com> wrote:
> > Browsing the mailing list I can see that the behaviour of -j with no
> > arguments has been discussed a few times. Given it would affect
> > backwards compatability to change how -j works, introducing a new
> > flag seems appropriate.
> 
> Yes, it has been discussed. I would not mind if the default without argument
> for -j would be to limit to nproc or nproc+1, instead of like now, creating a
> fork bomb when compiling a big project.

Isn't nproc or nproc+1 too much?  On systems with hyper-threading,
this will try using too many jobs, and might cause the system be
significantly less responsive.  Maybe nproc/2 is a better default?