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From: Nathan Bossart <[email protected]>
To: Magnus Hagander <[email protected]>
Cc: Bossart, Nathan <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Fujii Masao <[email protected]>
Cc: Justin Pryzby <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Mark Dilger <[email protected]>
Cc: Don Seiler <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: Estimating HugePages Requirements?
Date: Mon, 14 Mar 2022 10:34:17 -0700
Message-ID: <20220314173417.GA1020555@nathanxps13> (raw)
In-Reply-To: <CABUevEweO_ZxTQox=QoO8e3rZQm9qFVU+zdoQvazTH9F7HpdEQ@mail.gmail.com>
References: <[email protected]>
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	<CABUevEweO_ZxTQox=QoO8e3rZQm9qFVU+zdoQvazTH9F7HpdEQ@mail.gmail.com>

On Mon, Mar 14, 2022 at 04:26:43PM +0100, Magnus Hagander wrote:
> Nothing fixing this ended up actually getting committed, right? That
> is, we still get the extra log output?

Correct.

> And in fact, the command documented on
> https://www.postgresql.org/docs/devel/kernel-resources.html doesn't
> actually produce the output that the docs show, it also shows the log
> line, in the default config? If we can't fix the extra logging we
> should at least have our docs represent reality -- maybe by adding a
> "2>/dev/null" entry? But it'd be better to have it not output that log
> in the first place...

I attached a patch to adjust the documentation for now.  This apparently
crossed my mind earlier [0], but I didn't follow through with it for some
reason.

> (Of course what I'd really want is to be able to run it on a cluster
> that's running, but that was discussed downthread so I'm not bringing
> that one up for changes now)

I think it is worth revisiting the extra logging and the ability to view
runtime-computed GUCs on a running server.  Should this be an open item for
v15, or do you think it's alright to leave it for the v16 development
cycle?

[0] https://postgr.es/m/C45224E1-29C8-414C-A8E6-B718C07ACB94%40amazon.com

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com

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