[erlang-questions] SMP support in OpenBSD

[Michael Truog]

The "[smp:4:4]" suggests that smp support is working fine.  The total
cpu usage in top should reflect all available cores.  The jobs should
have affinity, making them stick to a core, but I really don't know
details.  As I understand it, the Erlang source code is not modified to
compile on OpenBSD, except to work around some gcc specifics (but no
SYSV specifics) so it should have the same functionality as on Linux
(excluding ODBC and jinterface... not sure about those).

Nikolay Epifanov wrote:
> Hi,
>
> I couldn't find any clear answer to whether Erlang supports SMP in OpenBSD
> or not.
> On starting it prints:
>
> $ erl
> Erlang R13B01 (erts-5.7.2) [source] [64-bit] [smp:4:4] [rq:4]
> [async-threads:0] [kernel-poll:false]
>
> Eshell V5.7.2  (abort with ^G)
> 1>
>
> But when I run test program only one beam.smp is started and maximum cpu
> load I can get is 100% total. It can be as a sum of load of 2 cores (for
> example 72% on one of them and 28% on the other) or 100% on a one core only
> leaving 3 other idle. Load jumps from on core to another but in total it
> keeps under 100%. Running erl with "-smp enable" and/or various "+S" didn't
> change anything.
>
> Is SMP supported in OpenBSD? And if not: is it planned to implement it?
>
>