From: Ilmari Heikkinen <kig@...>
Date: 2005-04-11T20:36:47+09:00
Subject: Re: Seven new VMs, all in a row


On 11.4.2005, at 12:04, flaig@sanctacaris.net wrote:
> My first thought concerning "explicit" threads was: Have a look at 
> Erlang (http://www.erlang.org), which is explicitly designed for 
> distributed applications. >20'000 threads per application are not 
> uncommon in large Erlang programs, so I take it for granted that their 
> implementation must be pretty highly optimized. (Don't you ask me 
> which kind of threads is underlying the Erlang VM, though -- 
> concurrency is a grammar-level feature of Erlang). However, it's all 
> about CSPs. No shared memory. So this won't be much of a help, will 
> it?

IIRC the Erlang threads are green threads and OS level parallelism is 
achieved through running several Erlang processes.

Re: green threads vs native threads, if a green threads implementation 
is 30 times faster, that's like having 29 extra cpus, no?


Ilmari Heikkinen
--
66. The regions beyond these places are either difficult of access 
because of their  excessive winters and great cold, or else cannot be 
sought out because, of some divine  influence of the gods.