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Synapse is the epitome of this
(i.redd.it)
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this post was submitted on 26 Mar 2025
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Great details! I know the difference personally, but this is a really nice explanation for other readers.
About the last point though: I'm not sure Go always uses the maximum amount of kernel threads it is allowed to use. I read it spawns one on blocking syscalls, but I can't confirm that. I could imagine it would make sense for it to spawn them lazily and then keep around to lessen the overhead of creating it in case it's needed later again, but that is speculation.
Edit: I dove a bit deeper. It seems that nowadays it spawns as many kernel threads as CPU cores available plus additional ones for blocking syscalls. https://go.dev/doc/go1.5 https://docs.google.com/document/u/0/d/1At2Ls5_fhJQ59kDK2DFVhFu3g5mATSXqqV5QrxinasI/mobilebasic