In investigating async file I/O I came across this. In a nutshell it's
the new epoll()
It's marginally more efficient although this is only apparent at very
high loads. What's more interesting is that io_uring accepts files as
well as network/pipe handles: avoiding the need for threads.
Here's a good intro: https://unixism.net/loti/index.html
If people think an IoUringReactor is worthwhile I'll open a ticket and
make a start.
However it will need a reviewer... :-)
Ian
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