On 9/8/2011 1:14, Invisible wrote:
> No, that's exactly what the "cache coherence" protocol prevents.

Sure. I'm just saying that saying "it's write-once" doesn't automatically 
mean it's thread safe in a modern multi-processor. The generated code 
actually has to take some care to tell the processor to flush cache lines 
and such.

> If defies my comprehension that what Google does is actually physically
> possible, but anyway...

It kind of boggles my mind too. Just the complexity of the monitoring stuff 
is stunning, let alone actually getting work done. :-)

-- 
Darren New, San Diego CA, USA (PST)
   How come I never get only one kudo?

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