[erlang-questions] "processor affinity" for processes

[Serge Aleynikov]

I don't recall seeing any code in the emulator that would actually set 
CPU affinity masks.  Though it would be a nice feature to have.

Serge

Zvi wrote:
> Hi David,
> 
> thanks,
> 
> 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
> OS?
> 
> Zvi
> 
> 
> 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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>