On 3/4/22 02:28, Pavel Begunkov wrote:
On 3/4/22 02:18, Jens Axboe wrote:
On 3/3/22 6:49 PM, Pavel Begunkov wrote:
On 3/3/22 16:31, Jens Axboe wrote:
On 3/3/22 7:40 AM, Jens Axboe wrote:
On 3/3/22 7:36 AM, Jens Axboe wrote:
The only potential oddity here is that the fd passed back is not a
legitimate fd. io_uring does support poll(2) on its file descriptor, so
that could cause some confusion even if I don't think anyone actually
does poll(2) on io_uring.
[...]
which is about a 15% improvement, pretty massive...
Is the bench single threaded (including io-wq)? Because if it
is, get/put shouldn't do any atomics and I don't see where the
result comes from.
Yes, it has a main thread and IO threads. Which is not uncommon, most
things are multithreaded these days...
They definitely are, just was confused by the bench as I can't
recall t/io_uring having >1 threads for nops and/or direct bdev I/O
fwiw, not trying to say it doesn't use threads
--
Pavel Begunkov
