You might be interested in this issue : 
http://code.google.com/p/googleappengine/issues/detail?id=2456

On 10 jan, 14:34, Jorge <[email protected]> wrote:
> It's been some discussion about this topic. You may want to seek posts
> with words "keep warm" or "cold start", for instance. See also the
> "Tragedy of the Commons, and Cold Starts" post in the Google Aps Forum
>
> http://groups.google.com/group/google-appengine/browse_thread/thread/...
>
> Jorge Gonzalez
>
> On Jan 9, 3:16 pm, Locke <[email protected]> wrote:
>
>
>
> > In my testing, apps which are hit every 2 minutes need to "boot" every
> > time (costing beacoup CPU cycles), whereas apps hit every 1 minute
> > stay loaded.
>
> > This limit seems to have changed over time. When I started using
> > appengine several months ago, it would wait ten minutes before
> > subjecting you to the unload/reload penalty.
>
> > I would gladly send google a stick of RAM in the mail if they would
> > just keep my app going!  ;-)
>
> > On Jan 9, 8:16 am, Yossi <[email protected]> wrote:
>
> > > Hi,
>
> > > I've noticed that the same request that takes in average 2 seconds
> > > could take more then 20 seconds after around 10 minutes that the
> > > application is idle (no requests are received). I assume that after
> > > ~10 minutes of no requests, the GAE shuts-down the instance.
> > > Is there an official information about this period of time? Is there a
> > > way to extend this period of time (besides writing a cron job that
> > > runs every minute)?
>
> > > Thanks.
>
> > > Yossi
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