Re: Mac OS X shared_buffers not same as postgresql.conf file

On Sat, 2011-09-24 at 14:43 -0500, Neil Tiffin wrote:
> On Sep 24, 2011, at 1:31 PM, Joe Conway wrote:
>
> > On 09/23/2011 02:33 PM, Neil Tiffin wrote:
> >> I have shared_buffers in the config file set for 32 MB and pgAdmin
> >> reports a value of 32 MB, but pgAdmin also says the current value is
> >> 4096. Can anyone point me to any docs about why the current value
> >> may be different than the config value? Temp_buffers are the same
> >> way, config file 8MB, but current value in pgAdmin is 1024?
> >
> > Internally shared_buffers is tracked as number of 8K pages.
> >
> > postgres=# show shared_buffers;
> > shared_buffers
> > ----------------
> > 32MB
> > (1 row)
> >
> > postgres=# select setting from pg_settings where name='shared_buffers';
> > setting
> > ---------
> > 4096
> > (1 row)
> >
> > postgres=# select 4096 * 8 / 1024 as MB;
> > mb
> > ----
> > 32
> > (1 row)
> >
> > HTH,
>
> Excellent, just what I was looking for. I know there had to be a simple explanation, even though it seems a little retarded that pgAdmin does not point this out.

And how do you get that value from pgAdmin? the config editor gives me
the value with its unit, so I guess it's not from the config editor.

--
Guillaume
http://blog.guillaume.lelarge.info
http://www.dalibo.com