this post was submitted on 02 Jul 2023
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I suspect that's less a Docker issue, and more to do with the code itself. Any code that's synchonous or serial in nature (eg. including a lot of web-calls to remote resources like federated sites) is going to max out due to IO or network latency long before saturating CPU, and becomes a natural target for horizontal scaling.
I'd be surprised if that's a pure Docker thing vs just Lemmy code in general. But, I don't have sufficient hardware to test on to prove that out.
That makes sense, I think you may be on the money there.