Re: [PATCH] Use MAP_HUGETLB where supported (v3)

On Wed, Oct 30, 2013 at 11:50 AM, Alvaro Herrera
<alvherre(at)2ndquadrant(dot)com> wrote:
>> >> 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.

Neither I found this parameter in the docs nor it works when I specify
it in postgresql.conf.

LOG: unrecognized configuration parameter
"dynamic_shared_memory_type" in file
"/etc/postgresql/9.3/main/postgresql.conf" line 114
FATAL: configuration file "/etc/postgresql/9.3/main/postgresql.conf"
contains errors

--
Kind regards,
Sergey Konoplev
PostgreSQL Consultant and DBA

http://www.linkedin.com/in/grayhemp
+1 (415) 867-9984, +7 (901) 903-0499, +7 (988) 888-1979
gray(dot)ru(at)gmail(dot)com