Now that io_uring will be in the upcoming 5.1 kernel, I spent some time writing up how it came to be and how it works. More formats likely coming, and I expect a few revisions too. For now, consider this v1.0 of the doc: http://kernel.dk/io_uring.pdf
I have not, but that would be trivial to do. Let me know what kind of test exactly you'd want to see and I can run it.
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Something simple -- fast storage device, read-only, data file much larger than RAM, uniform random access, 4kb reads, sufficient concurrency (or queue depth)
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So X processes for mmap access to get the desired concurrency?
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