18.4.4. Linux huge pages

From: piotrwlodarczyk89(at)gmail(dot)com
To: pgsql-docs(at)postgresql(dot)org
Subject: 18.4.4. Linux huge pages
Date: 2016-10-21 16:43:51
Message-ID: 20161021164351.1411.39835@wrigleys.postgresql.org
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The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.6/static/kernel-resources.html
Description:

Hi,

it's a mistake in 18.4.4. Linux huge pages (also in 9.4 and 9.5
documentation). Example how to count number f huge pages says:

6490428 / 2048 (PAGE_SIZE is 2MB in this case) are roughly 3169.154 huge
pages, so you will need at least 3170 huge pages:

It's very rare that PAGE_SIZE is 2MB. It's more common situation that the
value is 4096KB. But it's not a problem.

The VmPeak should by divded not by PAGE_SIZE but by Hugepagesize listed by
cat /proc/meminfo | grep Hugepagesize.

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