SHMMAX and shared_bufffers

From: "Thom Brown" <thombrown(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: SHMMAX and shared_bufffers
Date: 2008-11-11 16:57:10
Message-ID: bddc86150811110857r6768a4e0w7e3eefb60996ca5a@mail.gmail.com
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Hi,

I've noticed that if I set my SHMMAX to 256 * 1024 * 1024 (268435456)
and my shared_buffers value in postgresql.conf to 256MB the server
fails to start. I managed to find a tipping point: 249MB seems to be
too much and 248MB seems to be okay.

Could someone explain what I'm missing here? I thought the
shared_buffers could be anything up to SHMMAX?

Thanks in advance

Thom

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