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Date: Tue, 14 Apr 2020 12:08:52 +0200
From: Florian Weimer <>
To: Rich Felker <>
Cc:,  Norbert Lange <>
Subject: Re: [BUG] sysconf implementing _SC_NPROCESSORS_(CONF|ONLN) incorrectly

* 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).

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