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lsr: ls with io_uring

(rockorager.dev)
335 points mpweiher | 1 comments | 18 Jul 25 12:40 UTC | HN request time: 0s | source
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SillyUsername ◴[18 Jul 25 13:13 UTC] No.44604307[source]▶
Love it.

I'm trying to understand why all command line tools don't use io_uring.

As an example, all my nvme's on usb 3.2 gen 2 only reach 740MB/s peak.

If I use tools with aio or io_uring I get 1005MB/s.

I know I may not be copying many files simultaneously every time, but the queue length strategies and the fewer locks also help I guess.

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1. cesarb ◴[18 Jul 25 17:26 UTC] No.44607467[source]▶
> I'm trying to understand why all command line tools don't use io_uring.

Because it's fairly new. The coreutils package which contains the ls command (and the three earlier packages which were merged to create it) is decades old; io_uring appeared much later. It will take time for the "shared ring buffer" style of system call to win over traditional synchronous system calls.