Date: Thu, 16 Feb 2023 18:01:32 +0000 From: Jessica Clarke <jrtc27@freebsd.org> To: Alexey Dokuchaev <danfe@freebsd.org> Cc: Mateusz Guzik <mjguzik@gmail.com>, src-committers <src-committers@freebsd.org>, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: d9d5f2c042a5 - main - cpuset: add --count Message-ID: <A5FA934E-1DAA-45A9-9900-3E8A91BEF4FC@freebsd.org> In-Reply-To: <Y9/nUguGt6mlksGF@FreeBSD.org> References: <202302041751.314HpRrn042970@gitrepo.freebsd.org> <Y98dOenW9mulqNzm@FreeBSD.org> <CAGudoHGn1-zZTAX4r1h_xMpaA4zd9b2y4_N21Jah1pdGsqsuQA@mail.gmail.com> <Y9/nUguGt6mlksGF@FreeBSD.org>
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On 5 Feb 2023, at 17:28, Alexey Dokuchaev <danfe@freebsd.org> wrote: >=20 > On Sun, Feb 05, 2023 at 04:42:16PM +0100, Mateusz Guzik wrote: >> On 2/5/23, Alexey Dokuchaev <danfe@freebsd.org> wrote: >>> On Sat, Feb 04, 2023 at 05:51:27PM +0000, Mateusz Guzik wrote: >>>> commit d9d5f2c042a51a9f0dd69eb1fc349efd81ffa483 >>>>=20 >>>> cpuset: add --count >>>>=20 >>>> Can be used to count the number of hardware threads in the cpu = set. >>>>=20 >>>> For example: [...] >>>>=20 >>>> The intent is to replace calls to sysctl hw.ncpu and kern.smp.cpus >>>=20 >>> Speaking of these two, do we really need both, unless they are not >>> exactly the same? (They do seem so, though.) >>=20 >> They are not, cpuset grabs a pid argument, while nproc only works on = itself. >=20 > cpuset? pid argument? But I was not asking about cpuset, I was = wondering > whether we need both of these sysctls: >=20 > $ sysctl hw.ncpu > hw.ncpu: 2 > $ sysctl kern.smp.cpus > kern.smp.cpus: 2 One prints mp_ncpus, the other smp_cpus. As far as I=E2=80=99m aware = those two are the same for as long as userspace is running, and only differ during early boot before AP bringup (mp_ncpus is how many it will bring up, and smp_cpus counts up as they come online until the two become equal). Jess
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