Re: [Libguestfs] [libnbd] GSoC21: IO_uring optimization questions
On Wed, Mar 31, 2021 at 05:55:34PM +0100, Stefan Hajnoczi wrote:
On Tue, Mar 30, 2021 at 06:05:57PM +0100, Richard W.M. Jones wrote:
> [Adding Stefan: Have we retro-fitted io_uring into any other libraries?]
Not that I'm aware of. You could check Fedora or another Linux distro's
packages to find what depends on liburing and then investigate those
packages.
Yes that's a good point - it's likely they would depend on liburing.
A few queries like:
# dnf repoquery --whatrequires 'liburing' --qf '%{SOURCERPM}'
# dnf repoquery --whatrequires 'liburing.so.1()(64bit)' --qf
'%{SOURCERPM}'
shows only:
folly-2021.03.15.00-1.fc33.src.rpm
mpd-0.22.6-1.fc33.src.rpm
qemu-5.1.0-9.fc33.src.rpm
samba-4.13.5-0.fc33.src.rpm
- "folly" is "An open-source C++ library developed and used at
Facebook" (https://github.com/facebook/folly). Usage seems to be
confined to a couple of experimental backends.
- "mpd" "Music Player Daemon (MPD)" (https://www.musicpd.org).
Fairly
extensive use of io_uring for as an optional event backend. However
it's a server so not directly relevant to us.
qemu & samba we know about. Abhay: It might be worth looking at
qemu's use of io_uring in block/file-posix.c
Rich.
--
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