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I'm not sure what exactly you mean by "thread" here. Postgres is not thread-based - there are people working on that, but for now it's all processes.

Some of these limitations are mostly due to Postgres design, no doubt about that.

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Ah my mistake. I meant to write something like, you can have a thread per cpu core that is running an io_uring instance like you would have a bunch of workers in a pool in the "worker" implementation.

If there are no threads then this would be, you can have a process per cpu core

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