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Re: Default shared memory SGML mention

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: PostgreSQL-documentation <pgsql-docs(at)postgresql(dot)org>
Subject: Re: Default shared memory SGML mention
Date: 2001-05-02 22:08:45
Message-ID: 17050.988841325@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-docs
Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> so by my computations, we need about 700k added to the shared buffer
> cache area.  The documentation says to add 512k, not 700k.

This would depend on your -N setting.

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.

			regards, tom lane

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