Received: from candle.pha.pa.us (candle.navpoint.com [162.33.245.46]) by postgresql.org (8.11.3/8.11.1) with ESMTP id f48K6WA37737 for ; Tue, 8 May 2001 16:06:32 -0400 (EDT) (envelope-from pgman@candle.pha.pa.us) Received: (from pgman@localhost) by candle.pha.pa.us (8.10.1/8.10.1) id f48K6Qw27411; Tue, 8 May 2001 16:06:26 -0400 (EDT) From: Bruce Momjian Message-Id: <200105082006.f48K6Qw27411@candle.pha.pa.us> Subject: Re: Default shared memory SGML mention In-Reply-To: <7775.989352308@sss.pgh.pa.us> "from Tom Lane at May 8, 2001 04:05:08 pm" To: Tom Lane Date: Tue, 8 May 2001 16:06:25 -0400 (EDT) CC: PostgreSQL-documentation X-Mailer: ELM [version 2.4ME+ PL90 (25)] MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII X-Archive-Number: 200105/45 X-Sequence-Number: 728 > Bruce Momjian writes: > >> A little experimentation shows that the present multiplier for -B is > >> about 8350 bytes and the multiplier for -N about 14580 bytes on my > >> system (HPUX), which extrapolates to a fixed base of about 250K plus > >> the -B and -N contributions. In reality I believe the computation > >> is somewhat nonlinear, but that's probably close enough for starters. > > > I have updated the SGML sources to say for default shared memory values: > > > 250 kB + 8192 * buffers or infinity > > How did infinity get into this? And what happened to the -N > contribution? Infinity was always there. The column is labeled "Typical Values". As far as -N, buffers is always 2*N, right, so I figured it was in there already. -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026