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From: Dmitry Sychov <dmitry.sychov@gmail.com>
To: io-uring@vger.kernel.org
Subject: Any performance gains from using per thread(thread local) urings?
Date: Tue, 12 May 2020 23:20:57 +0300	[thread overview]
Message-ID: <CADPKF+ene9LqKTFPUTwkdgbEe_pccZsJGjcm7cNmiq=8P_ojbA@mail.gmail.com> (raw)

Hello,

I'am writing a small web + embedded database application taking
advantage of the multicore performance of the latest AMD Epyc (up to
128 threads/CPU).

Is there any performance advantage of using per thread uring setups?
Such as every thread will own its unique sq+cq.

My feeling is there are no gains since internally, in Linux kernel,
the uring system is represented as a single queue pickup thread
anyway(?) and sharing a one pair of sq+cq (through exclusive locks)
via all threads would be enough to achieve maximum throughput.

I want to squeeze the max performance out of uring in multi threading
clients <-> server environment, where the max number of threads is
always bounded by the max number of CPUs cores.

Regards, Dmitry

             reply	other threads:[~2020-05-12 20:21 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-12 20:20 Dmitry Sychov [this message]
2020-05-13  6:07 ` H. de Vries
2020-05-13 11:01   ` Dmitry Sychov
2020-05-13 11:56     ` Mark Papadakis
2020-05-13 13:15       ` Dmitry Sychov
2020-05-13 13:27         ` Mark Papadakis
2020-05-13 13:48           ` Dmitry Sychov
2020-05-13 14:12           ` Sergiy Yevtushenko
     [not found]           ` <CAO5MNut+nD-OqsKgae=eibWYuPim1f8-NuwqVpD87eZQnrwscA@mail.gmail.com>
2020-05-13 14:22             ` Dmitry Sychov
2020-05-13 14:31               ` Dmitry Sychov
2020-05-13 16:02               ` Pavel Begunkov
2020-05-13 19:23                 ` Dmitry Sychov
2020-05-14 10:06                   ` Pavel Begunkov
2020-05-14 11:35                     ` Dmitry Sychov

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