From: Charles Oliver Nutter <charles.nutter@...>
Date: 2008-07-02T05:31:36+09:00
Subject: Re: Threads and Ruby

ara.t.howard wrote:
> one of the reasons this is true is that for a heavily threaded ruby 
> program (green threads) you end up with the entire process sometimes 
> blocked on io and the threads end up getting into a pattern where all of 
> them need to write at once - a kind of rhythm - with processes the 
> ability for the OS to schedule access to resources ends up staggering 
> the phase of execution so access is generally faster than it 'ought' to 
> be taking only TPS into account.

Of course that's mostly a factor of Ruby's rather simplistic thread 
scheduling, which has a 10ms timeslice and a fairly basic selection 
algorithm. Obviously OS scheduling will be better/more advanced, but 
that applies equally well to native threads (like in JRuby).

- Charlie