That totally sucks. I can understand that it takes up more resources to 
have an app always loaded in an instance but when minimum instances is set, 
then it should mean that the app is kept in memory. If what you write is 
true (and I guess it is since nobody from Google has objected to it) then 
Google is not fulfilling what they themselves claim: "Because App Engine 
keeps idle instances in reserve, it is unlikely that requests will enter 
the pending queue except in exceptionally high load 
spikes." 
http://code.google.com/appengine/docs/adminconsole/performancesettings.html

On Thursday, March 8, 2012 10:10:03 PM UTC+1, Mark Rathwell wrote:
>
> Just wanted to follow up on this:
>
> Idle instances set to 1:  7 of 10 requests were loading requests (20-30 
> seconds)
> Idle instances set to 2:  3 of 9 requests were loading requests (and
> cost was about 4 times as much)
>
> This is a test app, with no other traffic, no new versions uploaded,
> etc., and these requests were about once a day for the last few weeks.
>  I'm giving up on finding a setting that will mimic always on for low
> traffic apps, and just setting up a cron job to ping the apps
> regularly.
>
>
>

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