From: Rich Felker <dalias@libc.org>
To: Florian Weimer <fw@deneb.enyo.de>
Cc: musl@lists.openwall.com, Norbert Lange <nolange79@gmail.com>
Subject: Re: [musl] [BUG] sysconf implementing _SC_NPROCESSORS_(CONF|ONLN) incorrectly
Date: Tue, 14 Apr 2020 11:55:22 -0400 [thread overview]
Message-ID: <20200414155522.GB11469@brightrain.aerifal.cx> (raw)
In-Reply-To: <877dyinzuz.fsf@mid.deneb.enyo.de>
On Tue, Apr 14, 2020 at 12:08:52PM +0200, Florian Weimer wrote:
> * Rich Felker:
>
> >> For glibc, we had to change our logic to artificially inflate the CPU
> >> to 2 if we cannot determine it, as the more conservative choice.
> >
> > Wait, you mean some software is abusing these interfaces to omit
> > memory barriers or something? *facepalm* *sigh*
>
> Yes, indeed. glibc itself parses uname -v output for this purpose
> (something we should probably remove, too).
I don't understand. Certainly it's not executing a child process at
runtime. Do you mean SYS_uname or are you talking about guessing
number of cpus for parallel build at make time or something?
Rich
next prev parent reply other threads:[~2020-04-14 15:55 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-09 10:29 Norbert Lange
2020-04-09 18:18 ` Szabolcs Nagy
2020-04-09 18:31 ` Florian Weimer
2020-04-10 1:02 ` Rich Felker
2020-04-14 10:08 ` Florian Weimer
2020-04-14 15:55 ` Rich Felker [this message]
2020-04-14 16:55 ` Florian Weimer
2020-04-15 9:38 ` Norbert Lange
2020-04-15 9:50 ` Florian Weimer
2020-04-15 9:57 ` Norbert Lange
2020-04-15 10:04 ` Szabolcs Nagy
2020-04-15 16:01 ` Rich Felker
2020-04-15 15:58 ` Rich Felker
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