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> One example of load they demonstrate has 20 million function calls submitted to XFaaS within 15 minutes.

> Meta’s XFaaS is their serverless platform that “processes trillions of function calls per day on more than 100,000 servers spread across tens of datacenter regions.”

This seems very low per server?

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Just for one trillion (not "trillions"), that'd be 10 million function calls per server per day, ~7k per minute. Sounds about right to me. They'll surely want to leave some room for traffic spikes, server failures and unforeseen issues. Server uplink could also be a factor - at least that was the major bottleneck the last time I ran infrastructure serving lots of clients (about 100 million), but they are probably smarter about this than I was back then.

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