Re: [Caml-list] Re: feature priorities (multithreading)

[Ranjan Bagchi <ranjan_bagchi@yahoo.com>]

I've been reading LtU lately (lambda.weblogs.com) and
came across this paper:
http://www.sics.se/~joe/apachevsyaws.html detailing a
high-performance web-server written in Erlang.

One point here is that the threads in Erlang uses a
ton of "microthreads" which don't use OS Threads at
all (and don't incur the overhead).  Stackless python
(www.stackless.com) does this too, and is able to
support massive concurrency.

Ranjan

--- cashin@cs.uga.edu wrote:
> James Leifer <James.Leifer@inria.fr> writes:
> 
> ...
> > What kind of multithreading features do you need? 
> It would be
> > interesting to understand what would be useful in
> Ocaml, especially
> > from people who have worked with Erlang, for
> example.
> 
> Personally, I try to avoid threads because they
> usually make my
> programs less portable and sometimes more complex. 
> But many people
> who do parallelizable computation, like scientific
> computations
> involving matrices, like to increase performance by
> taking advantage
> of SMP architectures.
> 
> If the threads in a program only run on one
> processor, then all you
> have is the overhead.  If they run on different
> processors at the same
> time, with access to the same main memory but with
> independent caches,
> then the performance benefits start to compensate
> for the extra
> complexity of multithreading.
> 
> -- 
> --Ed L Cashin            |   PGP public key:
>   ecashin@uga.edu        |  
> http://noserose.net/e/pgp/
> 
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