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Asked: 2026-06-17T07:42:02+00:00

I was surprised to find that idle instances of google app engine does nothing

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I was surprised to find that idle instances of google app engine does nothing to serve any new requests but dynamic instances handled most of them. Many idle instances are actually idle for some minutes.. Even I check logs but nothing left.

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Here is my application settings.

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Why dynamic instances does more be scheduled than idle ones? How can I improve my settings?

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1 Answer

  1. Editorial Team

    Idle instances are “reserve” instances so that when increase in traffic happens they are immediately available. This is what docs say: Idle Instances are pre-loaded with your application code, so when a new Instance is needed, it can serve traffic immediately.

    So you need to have a large number of idle instances only if you expect large traffic spikes, but only if you want to keep the same latency.

    Here is the calculation: instance can handle (up to) 10 req/s and it takes 15 sec to spin up. So if you expect traffic increases of 10 req/s within 15 sec period you only need one idle instance, if it’s an increase of 30 req/s you need two, etc..

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