On Tue, Aug 15, 2006 at 12:47:54PM -0600, Carl Youngblood wrote:
> I tried setting it to 2GB and postgres wouldn't start. Didn't
> investigate in much greater detail as to why it wouldn't start, but
> after switching it back to 1GB it started fine.
Most likely because you didn't set the kernel's shared memory settings
high enough.
To answer you other question:
http://archives.postgresql.org/pgsql-performance/2006-08/msg00095.php
> On 8/15/06, Jim C. Nasby <jnasby@pervasive.com> wrote:
> >See the recent thread about how old rules of thumb for shared_buffers
> >are now completely bunk. With 4G of memory, setting shared_buffers to 2G
> >could easily be reasonable. The OP really needs to test several
> >different values with their actual workload and see what works best.
>
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Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com
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