Where is the extra latency coming from?

[Spines]

I'm using GAE/Java.  I record the time it takes for my code to execute inside the code and output it to the logs as a debug message.   The time it takes for my code to execute is usually just a fraction of the time that is shown on the logs as the total time to respond to a request.

For example, in my code, my debug message will say that my code took 58ms to run.  But the log message will show: / 421ms 130cpu_ms 20api_cpu_ms, indicating that it took 421ms to return a response.  This is typical of every request, this is not due to loading requests.  Also, I am the only person accessing my app right now, so it's not because it's waiting for another request to finish processing first.

What causes this extra latency?  Is there any way I can fix it?

[Waleed Abdulla]

Check to see if there is a "pending_ms" value in the logs. If so, then that indicates that your request was put in a queue to wait for it's turn to run. I had a long thread about a similar question a week or so ago (just search for pending_ms in the archives to find it). 

Waleed

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[Spines]

There isn't any pending_ms.