[erlang-questions] multicore performance fine grained concurrency

[G.S.]

Hello,

I've had the same problems in my distributed systems, as Joe put it in his
book: "Big computations, small messages" is the way to leverage your
distributed systems in Erlang.
Also, creating separate nodes for every core, without smp in many cases let
me operate at full speed.

But as it stands something needs to be done about smp.

Regards,
-Gene

On Thu, May 6, 2010 at 10:50 AM, David N Murray <dmurray@REDACTED>wrote:

> On May 6, Johan Montelius scribed:
>
> >
> >
> >
> > smp 4:4 -> 126 ms
> > smp 2:2 -> 143 ms
> > smp disabled -> 65 ms
> >
> > :-(
> >
>
> I saw something similar using the Ring benchmark on both AMD (OpenBSD) and
> Intel (Vista) dual cores.  Both cores get utilized in the 40-50% range
> with smp enabled.  It takes 1/4 the time to run the benchmark with smp
> disabled as it does when smp is enabled. Takes advantage of two cores just
> fine if you run two OS processes with SMP disabled.  Doesn't do so well
> SMP enabled.  The ring benchmark just spawns and sends messages.
>
> smp 2:2 -> 18003 ms
> smp disabled -> 4867 ms
> 2 os processes -> ~5900 ms
>
> hth,
> Dave
>
>
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