From: Sanjeev Adwal <sanjeev_adwal@yahoo.co.in>
To: Tom Lane <tgl@sss.pgh.pa.us>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Pg Docs <pgsql-docs@lists.postgresql.org>
Subject: Re: Correction to documentation at https://www.postgresql.org/docs/12/kernel-resources.html
Date: Thu, 7 Oct 2021 08:14:16 +0000 (UTC)
Message-ID: <687695613.174336.1633594456217@mail.yahoo.com> (raw)
In-Reply-To: <CA+hUKGL-HX4herL4iDPwA9_bdLEc=LXTxT5M2aEnga3rT9xUmw@mail.gmail.com>
References: <163342695612.12514.13980479819790496744@wrigleys.postgresql.org>
<4070814.1633445322@sss.pgh.pa.us>
<CA+hUKGL-HX4herL4iDPwA9_bdLEc=LXTxT5M2aEnga3rT9xUmw@mail.gmail.com>
Thanks Thomas. Looks like I misread that.
On Wednesday, 6 October, 2021, 04:56:42 am IST, Thomas Munro <thomas.munro@gmail.com> wrote:
On Wed, Oct 6, 2021 at 3:48 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> PG Doc comments form <noreply@postgresql.org> writes:
> > On https://www.postgresql.org/docs/12/kernel-resources.html, the command to
> > calculate memory allocated to postgres is not correct. Following is the
> > command as shown in 18.4.5. Linux Huge Pages.
> > pmap 4170 | awk '/rw-s/ && /zero/ {print $2}', this command does not return
> > any results with correct pid. Probably /zero/ needs to be updated with
> > /anon_hugepage/
>
> The example seems to work as-given for me (testing on a RHEL8 system).
> It's of course not guaranteed to work on every flavor of Linux.
I think the pattern as given will show you the size if you are not
already using huge pages. For example, this line matches on my system
when I have /proc/sys/vm/nr_hugepages == 0:
00007f2932eb6000 145360K rw-s- zero (deleted)
If you are already using huge pages, it doesn't match anything,
because the relevant line looks like:
00007f6814e00000 145408K rw-s- anon_hugepage (deleted)
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To: pgsql-docs@postgresql.org
Cc: sanjeev_adwal@yahoo.co.in, tgl@sss.pgh.pa.us, thomas.munro@gmail.com, pgsql-docs@lists.postgresql.org
Subject: Re: Correction to documentation at https://www.postgresql.org/docs/12/kernel-resources.html
In-Reply-To: <687695613.174336.1633594456217@mail.yahoo.com>
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