| 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 19:17:24 |
| Message-ID: | 20131030191724.GH5922@eldon.alvh.no-ip.org |
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| Lists: | pgsql-hackers |
Alvaro Herrera escribió:
> Sergey Konoplev escribió:
> > 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.
The above is mistaken -- there's no way to disable the mmap() segment in
9.3, other than recompiling with EXEC_BACKEND which is probably
undesirable for other reasons.
I don't think I had ever heard of that recipe to use huge pages in
previous versions; since the win is probably significant in some
systems, we could have made this configurable.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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