Async IO testing

Hi,

for a project i'm starting i need to find any information
about the use of Async IO in squid. Is there any comparison
of this model against others (prefork, pre-threading, etc)l

-- 
1 December 2004 marks 49 years since Mrs Rosa Parks 
was arrested inMontgomery, Alabama, for refusing to
give up her seat on a bus to a white man– an arrest 
that gave birth to the civil rights movement in the US.