From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | PostgreSQL-documentation <pgsql-docs(at)postgresql(dot)org> |
Subject: | Re: Default shared memory SGML mention |
Date: | 2001-05-08 18:01:43 |
Message-ID: | 200105081801.f48I1ho19055@candle.pha.pa.us |
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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.
I have updated the SGML sources to say for default shared memory values:
250 kB + 8192 * buffers or infinity
Of course, buffers is 2 * connections by default.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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