How can I do the same thing over and over every 1-4 seconds in google app engine?

I want to run a script every few secon开发者_如何学编程ds (4 or less) in google app engine to process user input and generate output. What is the best way to do this?

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Run a cron job.

http://code.google.com/appengine/docs/python/config/cron.html

http://code.google.com/appengine/docs/java/config/cron.html

A cron job will invoke a URL at a given time of day. A URL invoked by cron is subject to the same limits and quotas as a normal HTTP request, including the request time limit. .

Also consider the Task Queue - http://code.google.com/appengine/docs/python/taskqueue/overview.html

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Reconsider what you're doing. As Ash Kim says, you can do it with the task queue, but first take a close look if you really need to run a process like this. Is it possible to rewrite things so the task runs only when needed, or immediately, or lazily (that is, only when the results are needed)?