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* 18.4.4. Linux huge pages
@ 2016-10-21 16:43 piotrwlodarczyk89@gmail.com
0 siblings, 1 reply; 2+ messages in thread
From: piotrwlodarczyk89@gmail.com @ 2016-10-21 16:43 UTC (permalink / raw)
To: pgsql-docs
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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* Re: 18.4.4. Linux huge pages
@ 2016-10-22 16:32 Andrew Kerber <andrew.kerber@gmail.com>
parent: piotrwlodarczyk89@gmail.com
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Kerber @ 2016-10-22 16:32 UTC (permalink / raw)
To: piotrwlodarczyk89@gmail.com; +Cc: pgsql-docs
In most versions of Linux, the default hugepage size is 2m. Other Unix versions may have different hugepage sizes, e.g. AIX, but Linux defaults to 2m
Sent from my iPad
> On Oct 21, 2016, at 11:43 AM, piotrwlodarczyk89@gmail.com wrote:
>
> 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.
>
>
>
> --
> Sent via pgsql-docs mailing list (pgsql-docs@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-docs
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