| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Sergey Konoplev <gray(dot)ru(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Abhijit Menon-Sen <ams(at)2ndquadrant(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Andres Freund <andres(at)2ndquadrant(dot)com>, hlinnakangas(at)vmware(dot)com |
| Subject: | Re: [PATCH] Use MAP_HUGETLB where supported (v3) |
| Date: | 2013-10-30 18:50:18 |
| Message-ID: | 20131030185018.GG5922@eldon.alvh.no-ip.org |
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| Lists: | pgsql-hackers |
Sergey Konoplev escribió:
> On Wed, Oct 30, 2013 at 8:11 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > Sergey Konoplev <gray(dot)ru(at)gmail(dot)com> writes:
> >> There were an ability to back shared memory with hugepages when using
> >> <=9.2. I use it on ~30 servers for several years and it brings 8-17%
> >> of performance depending on the memory size. Here you will find
> >> several paragraphs of the description about how to do it
> >> https://github.com/grayhemp/pgcookbook/blob/master/database_server_configuration.md.
> >
> > What this describes is how to modify Postgres to request huge pages.
> > That's hardly built-in support.
>
> I wasn't talking about a built-in support. It was about an ability (a
> way) to back sh_buf with hugepages.
Then what you need is to set
dynamic_shared_memory_type = sysv
in postgresql.conf.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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