Thanks, Tim.

I think that's the first clear description I've read of this particular billing 
phenomena.

Google overlords: Add those two paragraphs to your official docs!

On Sep 10, 2011, at 9:14 AM, Tim wrote:

> 
> Quote: In addition, there is a 15-minute charge ($0.02) every time an 
> instance starts....
> 
> Sorry to keep banging on about this, but see the latest explanations of how 
> the pricing works... what you report here is what we all heard, but it's not 
> true.
> 
> A maximum number of "max-idle-instances" have a 15-minute charge every time 
> they start up (in return for which they'll stay in memory for at least 15 
> minutes) but any instances beyond that count do NOT have a 15-minute charge 
> for starting up, they are charged only for the time they are actively serving 
> requests (subject, I expect, to some granularity in the billing system, but 
> this should be considerably less than 15 minutes).
> 
> If you have max-idle set to 1, and a 1 minute massive burst meant that 100 
> instances were started, but then the traffic died back to nothing, then only 
> 1 of those instances would have the 15 minute charge (and would be 
> effectively guaranteed to stay in memory that long) - the scheduler may even 
> decide, if the machines are not needed for other apps and there's spare 
> capacity, to keep some or many of the 100 instances in memory (there may be 
> another burst), but even if it does so, you're not paying for the other 99 
> being idle - it's what I termed the "free-idle" state.
> 
> Cheers
> 
> --
> Tim
> 
> 
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