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From: Andres Freund <[email protected]>
To: Michael Paquier <[email protected]>
Cc: Alexander Lakhin <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: MARK CALLAGHAN <[email protected]>
Cc: [email protected]
Subject: Re: benchmark results comparing versions 15.2 and 16
Date: Mon, 15 May 2023 17:54:53 -0700
Message-ID: <[email protected]> (raw)
In-Reply-To: <ZGLRd9RRx/[email protected]>
References: <CAFbpF8N4bVFZ+eyWFj_+fZXZFSayk2kJVtZnouUVKGHudiDrSw@mail.gmail.com>
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Hi,

On 2023-05-16 09:42:31 +0900, Michael Paquier wrote:
> > I get quite variable performance if I don't pin client / server to the same
> > core, but even the slow performance is faster than 45k.
> 
> Okay.  You mean with something like taskset or similar, I guess?

Yes. numactl --physcpubind ... in my case.  Linux has an optimization where it
does not need to send an IPI when the client and server are scheduled on the
same core. For single threaded ping-pong tasks like pgbench -c1, that can make
a huge difference, particularly on larger CPUs.  So you get a lot better
performance when forcing things to be colocated.

Greetings,

Andres Freund

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