What I like about  AWS Lambda is that it lets you run code without provisioning or managing servers, and you pay only for what you use. Since we  launched Lambda in 2014, you have been charged for the number of times your code is triggered (requests) and for the time your code executes, rounded up to the nearest 100ms (duration).

Starting today, we are rounding up duration to the nearest millisecond with no minimum execution time.

With this new pricing, you are going to pay less most of the time, but it’s going to be more noticeable when you have functions whose execution time is much lower than 100ms, such as low latency APIs.

For example, let’s look at a simple web app that I have running. In the  Amazon CloudWatch Logs, for each invocation there is a REPORT line. To improve readability, I am breaking the REPORT line into three lines here:

REPORT RequestId: 35a7e0cb-4902-490d-b8d3-eb315dded660
Duration: 27.40 ms  Billed Duration: 100 ms Memory Size: 1024 MB  Max Memory Used: 472 MB

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