[erlang-questions] Strange observation running in an SMP environment.

Ronny Meeus <>
Wed Jun 13 11:32:36 CEST 2012


On Wed, Jun 13, 2012 at 11:12 AM, Jesper Louis Andersen
<> wrote:
> On Tue Jun 12 22:39:02 2012, Ronny Meeus wrote:
>
>> Does the issue that I had (pure message passing without extra load)
>> have anything to do with the fact that I'm running on Linux?
>> I sometimes have the impression (not in the context of my Erlang
>> playing) that the scheduler does not always makes the right decision
>> during the migration of processes between cores?
>
>
> No, it has not. I ran your examples on an Apple OSX 10.7.4,
>
> tiefling:~ jlouis$ uname -a
> Darwin tiefling.issuu.com 11.4.0 Darwin Kernel Version 11.4.0: Mon Apr  9
> 19:32:15 PDT 2012; root:xnu-1699.26.8~1/RELEASE_X86_64 x86_64
>
> and I got roughly the same results as yours. The problem is that really good
> parallelism speedup requires you to do very specific things upon your data
> in order to achieve that parallel speedup. Erlang is built for concurrency
> more than parallelism - if you want that I'd suggest looking into Haskell :)
>
>
> --
> Jesper Louis Andersen
>  Erlang Solutions Ltd., Copenhagen, DK

Thanks for your help.

Best regards,
Ronny



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