CODEWITHSUNDEEP
javagoogle-app-engine
Kyle
Kyle

Reputation: 22045

Google App Engine - What causes cold start latency time to be high, even though my CPU usage is relatively low?

I've optimized my code to use only lightweight libraries. I'm even using the low level datastore rather than JDO.

And my cold start CPU usage has dropped from about 5 seconds to about 1.5 seconds. However, the time it takes to respond is often about 4.5 seconds, though it varies a lot.

Here are some lines from my logs:

What is the app engine doing for those extra 3 seconds that apparently isn't using any CPU?

Upvotes: 0

Views: 746

Answers (2)

Sudhir Jonathan
Sudhir Jonathan

Reputation: 17516

You seem to have already done a lot to improve your application's cold start time... I really don't think there's anything else that you can do. Keep in mind though, that this is a known problem and the GAE team seems to be working on cutting this down as much as they can. You'll probably see start time improve without any more work on your part.

EDIT: It turns out precompilation is now on by default. That should also give you a boost.

Upvotes: 1

Stephen C
Stephen C

Reputation: 719099

Probably there are fewer network interactions to fetch support classes from Google.

Upvotes: 1

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