Are app engine instances CPUs throttled after a while?

Question

I'm using a App Engine task handler, to process a workload (import files to database). Looking at my Cloud SQL monitoring, I see that after some minutes, the write rate declines (see picture), and my task runs much slower. Does Google throttle the Instance's CPU or might there be other reasons?

Answer 1

According to the documentation https://cloud.google.com/compute/docs/cpu-platforms

all cores have turbo frequency, although it is not guaranteed.

All-core turbo frequency: The frequency at which each CPU typically runs when all cores in the socket are not idle at the same time.

This post explains how you can monitor your CPU speed https://askubuntu.com/questions/218567/any-way-to-check-the-clock-speed-of-my-processor

You can ssh into the machine and monitor it real-time.