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From: Bruce Momjian <pgman@candle.pha.pa.us>
Message-Id: <200105082111.f48LB5E03982@candle.pha.pa.us>
Subject: Re: Default shared memory SGML mention
In-Reply-To: <8134.989354268@sss.pgh.pa.us> "from Tom Lane at May 8,
	2001 04:37:48 pm"
To: Tom Lane <tgl@sss.pgh.pa.us>
Date: Tue, 8 May 2001 17:11:04 -0400 (EDT)
CC: PostgreSQL-documentation <pgsql-docs@postgresql.org>
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> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Yes, but shared memory limits are based on buffers, not connections,
> > right?  The per-connection overhead is pretty small, no?
> 
> I gave you my experimentally-derived formula already:
> 
> 	250Kb + 8350 * B + 14580 * N
> 
> I don't see how you can consider the N term negligible.

OK, patch applied.

-- 
  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

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Index: doc/src/sgml/runtime.sgml
===================================================================
RCS file: /home/projects/pgsql/cvsroot/pgsql/doc/src/sgml/runtime.sgml,v
retrieving revision 1.64
diff -c -r1.64 runtime.sgml
*** doc/src/sgml/runtime.sgml	2001/05/07 15:55:27	1.64
--- doc/src/sgml/runtime.sgml	2001/05/08 21:09:21
***************
*** 1481,1487 ****
        <row>
         <entry><varname>SHMMAX</></>
         <entry>Maximum size of shared memory segment (bytes)</>
!        <entry>250 kB + 8192 * buffers or infinity</entry>
        </row>
  
        <row>
--- 1481,1487 ----
        <row>
         <entry><varname>SHMMAX</></>
         <entry>Maximum size of shared memory segment (bytes)</>
!        <entry>250 kB + 8.2kB * buffers + 14.2kB * max_connections or infinity</entry>
        </row>
  
        <row>

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