Date: Tue, 14 Feb 2023 01:21:29 +0100 From: Jan Beich <jbeich@FreeBSD.org> To: Mateusz Guzik <mjguzik@gmail.com> Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: 48bfd3597654 - main - Add nproc(1) Message-ID: <ttzp-3xme-wny@FreeBSD.org> In-Reply-To: <CAGudoHForbPDR-vzXjKcDJTv=VTj-p=icbfZ2rogPy31r_jL4A@mail.gmail.com> (Mateusz Guzik's message of "Tue, 14 Feb 2023 00:58:41 %2B0100") References: <202302081947.318Jlbt6052826@gitrepo.freebsd.org> <20230208202736.L7hpB%steffen__28609.3347867549$1675888077$gmane$org@sdaoden.eu> <1qmt-6s1w-wny@FreeBSD.org> <CAGudoHForbPDR-vzXjKcDJTv=VTj-p=icbfZ2rogPy31r_jL4A@mail.gmail.com>
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Mateusz Guzik <mjguzik@gmail.com> writes: > On 2/14/23, Jan Beich <jbeich@freebsd.org> wrote: > >> Steffen Nurpmeso <steffen@sdaoden.eu> writes: >> >>> |+ if (all_flag) { >>> |+ cpus = sysconf(_SC_NPROCESSORS_ONLN); >>> >>> is not compatible -- note i like the FreeBSD way better, and maybe >>> someone should make a bug report even. >>> >>> #?0|kent:$ getconf -a|grep NPROC >>> _NPROCESSORS_CONF 8 >>> _NPROCESSORS_ONLN 4 >> >> See also https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230330 >> >> $ cpuset -l 2-5 -- getconf -a | fgrep _NPROC >> _NPROCESSORS_CONF: 8 >> _NPROCESSORS_ONLN: 4 >> > > As I mentioned previously in the thread, on linux these *don't* react > to cpusets (or tasksets in linux parlance): > > $ getconf -a | grep _NPROC > _NPROCESSORS_CONF 4 > _NPROCESSORS_ONLN 4 > $ taskset --cpu-list 0 getconf -a | grep _NPROC > _NPROCESSORS_CONF 4 > _NPROCESSORS_ONLN 4 > > consequently the patch proposed in the bz would introduce an > incompatibility with linux I've used kern.smp.cpus in old patches but found musl more practical. _SC_NPROCESSORS_ONLN is often used as a default number of jobs. glibc: - /sys/devices/system/cpu/online - /proc/stat - sched_getaffinity musl: - sched_getaffinity bionic: - /sys/devices/system/cpu/online - /proc/stat (Android < 7)
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