Are crons executed globally or per app instance (i.e. load dependent)?

If I define a cron in App Engine to execute "ev开发者_JAVA技巧ery 10 minutes" - does that mean:

(a):

• "every 10 minutes per app instance (i.e. load dependent)"

(b):

• "every 10 minutes globally across all instances of the application" (i.e. load independent)?

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It is once globally every 10 minutes. Note that the interval refers to the time between jobs. So job 2 will start 10 minutes after job 1 finishes. This might be important if your job is long-running (e.g., if it takes 5 minutes to run, then it will actually start every 15 minutes if you specify "every 10 minutes").