| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
| Cc: | Greg Stark <gsstark(at)mit(dot)edu>, Josh Berkus <josh(at)agliodbs(dot)com>, Jim Nasby <jim(at)nasby(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, rsmogura(at)softperience(dot)eu, PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: 2nd Level Buffer Cache |
| Date: | 2011-03-21 16:00:42 |
| Message-ID: | 4D87762A.5050303@enterprisedb.com |
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| Lists: | pgsql-hackers |
On 21.03.2011 17:54, Merlin Moncure wrote:
> Can't you make just one large mapping and lock it in 8k regions? I
> thought the problem with mmap was not being able to detect other
> processes (http://www.mail-archive.com/pgsql-general(at)postgresql(dot)org/msg122301.html)
> compatibility issues (possibly obsolete), etc.
That mail is about replacing SysV shared memory with mmap(). Detecting
other processes is a problem in that use, but that's not an issue with
using mmap() to replace shared buffers.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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