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Re: [HACKERS] Changing the default configuration (was Re:

From: "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com>
To: Curt Sampson <cjs(at)cynic(dot)net>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>,Merlin Moncure <merlin(dot)moncure(at)rcsonline(dot)com>,PostgresSQL Hackers Mailing List <pgsql-hackers(at)postgresql(dot)org>,<pgsql-advocacy(at)postgresql(dot)org>
Subject: Re: [HACKERS] Changing the default configuration (was Re:
Date: 2003-02-12 01:02:09
Message-ID: Pine.LNX.4.33.0302111800080.1977-100000@css120.ihs.com (view raw or flat)
Thread:
Lists: pgsql-advocacypgsql-hackerspgsql-performance
On Wed, 12 Feb 2003, Curt Sampson wrote:

> On Tue, 11 Feb 2003, Tom Lane wrote:
> 
> > It's a lot too conservative.  I've been thinking for awhile that we
> > should adjust the defaults.
> 
> Some of these issues could be made to Just Go Away with some code
> changes. For example, using mmap rather than SysV shared memory
> would automatically optimize your memory usage, and get rid of the
> double-buffering problem as well. If we could find a way to avoid using
> semephores proportional to the number of connections we have, then you
> wouldn't have to worry about that configuration parameter, either.
> 
> In fact, some of this stuff might well improve our portability, too.
> For example, mmap is a POSIX standard, whereas shmget is only an X/Open
> standard. That makes me suspect that mmap is more widely available on
> non-Unix platforms. (But I could be wrong.)

I'll vote for mmap.  I use the mm libs with apache/openldap/authldap and 
it is very fast and pretty common nowadays.  It seems quite stable as 
well.


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