[erlang-questions] "processor affinity" for processes

Zvi exta7@REDACTED
Thu Jan 17 12:26:59 CET 2008

Hi David,


but what if I want to run two Erlang nodes on on dual CPU machine?
Will commands bellow work?

~/Desktop/tmp% erl -sname cpu1 +S 1
~/Desktop/tmp% erl -sname cpu2 +S 1

Will each of them grab it's own CPU, or this will be left to the mercy of


David King-6 wrote:
>> There are also need to control number of CPUs/cores Erlang VM using,  
>> then
>> the rest we can use for ports or another non-Erlang external  
>> processes.
> You can already do this.
> ~/Desktop/tmp% erl
> Erlang (BEAM) emulator version 5.6 [source] [smp:2]
> <snip>
> ~/Desktop/tmp% erl +S 1
> Erlang (BEAM) emulator version 5.6 [source] [smp:1]
>  From the man page:
>           +S Number:
>               Sets the number of scheduler threads to use when SMP  
> support has been enabled. Valid range is 1-1024. If the Erlang
>               runtime  system is able to determine the number of  
> processor cores available, the default value will equal the this
>               value; otherwise, the default value will be one.
>               This flag will be ignored if the emulator doesn't have  
> SMP support enabled (see the -smp flag).
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