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Their quoted limits on AWS seem quite off.

> As of 2024, they can only use 3 CPUs (6 threads) and 10 GB of memory

Actually you get 1vCPU (eg a hyperthread) per 1769MB of memory[1]

[1] -https://docs.aws.amazon.com/lambda/latest/dg/configuration-f...

> Response bandwidth is 2 Mbps

This is shockingly low, and I wouldn't believe it without data. 16Mbps (2MB/s) would be more believable. In my experience you can reliably get 25MB/s (~400Mbps) in the network layer of things in AWS.



You're correct, it is 2 MB/s. The actual bandwidth from the AWS Lambda docs is:

>Uncapped for the first 6 MB of your function's response. For responses larger than 6 MB, 2MBps for the remainder of the response

Some of the other numbers in the article are also incorrect. Lambda functions using containers can use a 10 GB container image (the article claims 50 MB), and container images are actually the faster/preferred way to do it these days.


(Author) Yes, it’s in the page linked in the section — and the maximum memory is 10240 MB, so that’s 5.8 vCPU < 3 physical CPUs.

Good point about 2 Mbps vs 2 MBps, I’ll update that. Forgive me for the typo!




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