[erlang-questions] FreeBSD cpu topology detection

Garret Smith garret.smith@REDACTED
Fri Oct 17 18:34:55 CEST 2014

On Thu, Oct 16, 2014 at 6:04 PM, Garret Smith <garret.smith@REDACTED> wrote:
> CPU topology detection seems broken (at least incomplete) on FreeBSD.
> erlang:system_info(cpu_topology) returns 'undefined' on the few machines I
> have at my disposal.
> I'm going to take a stab at a patch, but I'd like some help from other
> FreeBSD users out there first.
> Can any FreeBSD users please send me:
>     a) the output of 'sysctl kern.sched.topology_spec'
>     b) a few lines from your 'dmesg' about the processor configuration like:
> FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
> FreeBSD/SMP: 1 package(s) x 4 core(s) x 2 SMT threads
> Even if your topology is correctly determined, this info will help me ensure
> I don't introduce a regression.
> Thanks,
> Garret

Thank you to all who sent me information.

I now have a good collection of systems with {2, 4, 8} logical
processors and {2, 4} cores.  Any info on machines with >8 logical
processors would be appreciated.

No one reported that topology detection worked.


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