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Re: bg worker: patch 1 of 6 - permanent process

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Markus Wanner <markus@bluegap.ch>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Itagaki Takahiro <itagaki.takahiro@gmail.com>, PostgreSQL-development Hackers <pgsql-hackers@postgresql.org>
Date: 2010-08-26T21:58:56Z
Lists: pgsql-hackers 
On Thu, Aug 26, 2010 at 3:40 PM, Markus Wanner <markus@bluegap.ch> wrote:
> On 08/26/2010 09:22 PM, Tom Lane wrote:
>>
>> Not having to have a hard limit on the space for unconsumed messages?
>
> Ah, I see. However, spilling to disk is unwanted for the current use cases
> of imessages. Instead the sender needs to be able to deal with
> out-of-(that-specific-part-of-shared)-memory conditions.

Shared memory can be paged out, too, if it's not being used enough to
keep the OS from deciding to evict it.  And I/O to a mmap()'d file or
shared memory region can remain in RAM.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company